ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (8,168)
  • Chemistry  (8,168)
  • 1980-1984  (8,168)
  • 1935-1939
  • Physics  (8,168)
Collection
  • Articles  (8,168)
Source
Keywords
Publisher
Years
Year
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    The importance of energetic particle precipitation on the chemical composition of the middle atmosphere (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 128-151 
    Details
    ISSN: 1420-9136
    Keywords: Galactic cosmic rays ; Solar proton events ; Particle precipitation ; Chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An assessment is made of the relative contribution of certain classes of energetic particle precipitation to the chemical composition of the middle atmosphere with emphasis placed on the production of odd nitrogen and odd hydrogen species and their subsequent role in the catalytic removal of ozone. Galactic cosmic radiation is an important source of odd nitrogen in the lower stratosphere but since the peak energy deposition occurs below the region where catalytic removal of O3 is most effective, it is questionable whether this mechanism is important in the overall terrestrial ozone budget. The precipitation of energetic solar protons can periodically produce dramatic enhancement in upper stratospheric NO. The long residence time of NO in this region of the atmosphere, where catalytic interaction with O3 is also most effective, mandates that this mechanism be included in future modelling of the global distribution of O3. Throughout the mesosphere the precipitation of energetic electrons from the outer radiation belt (60°≲Λ≲70°) can sporadically act as a major local source of odd hydrogen and odd nitrogen leading to observable O3 depletion. Future satellite studies should be directed at simultaneously measuring the precipitation flux and the concomitant atmosphere modification, and these results should be employed to develop more sophisticated models of this important coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01586448
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Partial purification and characterization of the bone resorption factor fromActinomyces viscosus (1982)
    Springer
    Calcified tissue international 34 (1982), S. 49-53 
    Details
    ISSN: 1432-0827
    Keywords: Bacterial amphophile ; Purification ; Chemistry ; Resorption ; Ca influx ; Cyclic AMP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The bone resorptive factor and amphipathic antigen (AcA) previously identified by us in preparations fromActinomyces viscosus have been partially purified, characterized chemically, and compared. They elute at the same location on chromatography with Ac 22. The fatty acid composition of AcA and the bone resorptive factor is the same. Some differences in carbohydrate composition are observed. TheActinomyces factor does not affect calcium influx or cyclic AMP in isolated bone cells. Therefore it is concluded that AcA stimulates resorption either by gaining entrance into bone cells or by way of a yet undetermined second messenger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411208
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pharmakologisch-aktive polymere, 2120. Mitteilung: T. Hirano, W. Klesse, H. Ringsdorf, Makromol. Chem. 180, 1125 (1979).. Orientierende Untersuchungen zur körperverteilung und Ausscheidung von poly[2-(methylsulfinyl)ethylacrylat]en bei der Ratte (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 351-366 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly[2-(methylsulfinyl)ethyl acrylate] (1) was synthesized as well as derivatives 14C-labelled in side groups (6) or 14C-labelled in the main chain (11). Polymer 11 with the 14C-labelled main chain was fractionated by precipitation. The η-M-relation determined by measurements of unlabelled polymers in the ultracentrifuge for comparison was used to establish the viscosimetrically determined molecular weights of the labelled fractions. After intravenous application of aqueous solutions of the polymer in rats the excretion rate up to 72 h after treatment was ascertained to ca. 50%; the concentration in the blood serum was found to be strikingly high. A tendency to reinforced storage in organs of high phagocytose activity by growing molecular weight was observed. The tumor affinity was  -  if at all  -  low.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The effect of stereochemical structure on the viscoelastic behaviour of poly(ethyl methacrylate) (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 277-288 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The low-frequency viscoelastic behaviour of three stereoregular samples of poly(ethyl methacrylate) (PEMA) in the main transition region was investigated. The main effect of tacticity in the transition from the syndiotactic sample to the isotactic one consists in a shift of the main transition region (or of the glass transition temperatures, Tg) to lower temperatures by ≈ 70 K. The temperature dependence of the shift factor of all samples could not be adequately described by the single Williams-Landel-Ferry (WLF) equation within the whole range of temperatures; in the range T〉Tg+60K, isotactic PEMA exhibited the largest departures from the WLF equation. In all cases, departures from the WLF equation could be quantitatively described in terms of the temperature dependence of the Andreade coefficient β. The temperature dependence of the Andreade compliance, JA, was also most pronounced for the isotactic sample. Vertical correction of the complex modulus G*, with WLF horizontal shifts preserved, led to the lowest activation energy ΔH for the isotactic sample, which means the highest magnitude of secondary relaxation mechanism in this sample. The birefringence measurement showed that the molecular nature of the deformational birefringence is independent of the tacticity of the sample and does not vary in the range Tg+25K〈T〈Tg+100K. In all the characteristics mentioned here, parameters of a conventional sample obtained by radical polymerization approached those of the syndiotactic sample.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810125
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Struktur und Eigenschaften segmentierter polyetherester, 32. Mitt. cf.5. Synthese definierter Oligomerer des polybutylenterephthalatsHerrn Prof. Dr. Batzer zum 60. Geburtstag gewidmet (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 301-323 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis of some series of oligo(oxytetramethylene oxyterephthaloyl) [oligo(butylene terephthalate)s] with different but well-defined end groups is described. The separation of artificial mixtures of the oligomers by high pressure liquid chromatography was studied under various elution and column conditions, and thus, the purity of the individual oligomers was demonstrated. The equilibrium melting point Tm0 = 236 ± 4°C and the corresponding heat of melting ΔHm0 = 28,7 kJ·mol-1 of poly(butylene terephthalate) was determined from the analysis of the melting behaviour of the oligomers as depending on the degree of polymerization and the structure of the end groups.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810202
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Condensation polymerization of 2,2′-diiodobiphenyl-4,4′-dicarbonyl dichloride with some mono- and diamino compounds (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 333-340 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Several potentially thermostable polyamides were prepared. 2,2′-Diiodobiphenyl-4,4′-dicarboxylic acid and its diacid chloride 1 were synthesized. The latter was condensed with several amines, e.g., aniline, p-toluidine, p-chloroaniline, and 2-aminopyridine, to prepare model compounds of polyamides testing the reactivity of the diacid dichloride 1 towards various amines, and to compare their spectra with those of the polymers. The polyamides themselves were prepared by solution and melt condensation of diacid chloride 1 with the following diamines: p-phenylenediamine, m-phenylenediamine, 2,6-diaminotoluene, benzidine, bis(4-aminophenyl)-methane, 4,4′-diaminobiphenyl sulfone, and 3,3′-diaminobenzophenone. The solubility of the polyamides in different solvents and their inherent viscosities were also measured. The values of the inherent viscosity were in the range of 0,1-1,9. The UV, IR, and 1H NMR spectra of the prepared polyamides were recorded. The melting points of the polymers were found to be higher than 360°C and the thermogravimetric curves showed that the polymers are stable up to 400°C in air.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The high pressure polymerization of pure ethylene (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 373-382 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of pure ethylene polymerizations performed to maximum pressures of 2,5 kbar and temperatures up to 250°C is discussed. The rate data which are obtained via quantitative infrared and near infrared spectroscopy closely fit to an overall polymerization rate law of the order 2,5 ± 0,2 in the ethylene concentration. The overall activation energy is determined to be 136,3 ± 6 kJ/mol. For the initiation reaction an activation energy of 209,8 ± 12 kJ/mol is derived. This fairly large value establishes that in dense high purity ethylene a thermally initiated (spontaneous) reaction to high molecular weight material occurs.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810208
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Polymer conformation and NMR chemical shifts, 1. 1H NMR spectrum of alternating methyl methacrylate-styrene copolymer (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 383-397 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: NMR chemical shifts of the methoxyl and α-methyl protons in the alternating methyl methacrylate-styrene copolymer are calculated by taking into account the contributions of the diamagnetic shielding and the magnetic anisotropy effect of the benzene rings in styrene units. The conformational probabilities of the copolymer chain are calculated according to Flory's matrix method. It is deduced from the calculation that NMR should occur at higher field for the methoxyl and at lower field for the α-methyl protons of the methyl methacrylate unit in meso configuration with an adjacent styrene unit (regarding the methoxycarbonyl and phenyl groups) than for the corresponding protons in the unit of racemic configuration. Further, the differences between the chemical shifts for these protons in meso and racemic dyads are nearly equivalent to the differences in chemical shifts between two adjacent peaks of the observed triplet spectra. This result indicates that the spectral assignment based on a theoretical calculation is quite consistent with the one made by a conventional simulation method: from the lower magnetic field, peaks of cosyndiotactic, coheterotactic, and coisotactic triads appear in this order for the methoxyl protons and in the opposite order for the α-methyl protons. Magnetic anisotropy effect contributes to these tacticity-dependent chemical shifts to a far greater extent than diamagnetic shielding. The variation of the chemical shifts due to measuring temperature, probability of isotactic addition, and interactions between groups more than five bonds apart is also discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810209
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Langfristige konformationsänderung von makromolekülen in lösung, 1. Polyacrylamide (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 823-838 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The viscosity of aqueous polyacrylamide solutions does not remain constant. During a period of many weeks it decreases by as much as 30%. Simultaneously a loss of flocculation activity occurs. This unusual behaviour  -  also called ageing or solution instability  -  is examined. Viscosity and light scattering investigations were made. The viscosity was also determined by addition of substances which influence hydrogen bonds. It could be demonstrated, that in high molecular weight polyacrylamide hydrogen bonds are effective. Light scattering measurements result in curved angular dependence of scattered light, which must be regarded as real and specific for the high molecular weight polyacrylamides in water. The Zimm plot for polyacrylamide in ethylene glycol was undistorted. The refractive index increment decreases with time during the investigations. From the Zimm plots it follows, that the radius of gyration decreases with time. The molecular weight however remains constant. Based on the experimental results a mechanism is assumed with a long-term conformational change of the macromolecules. The orientated segments  -  stabilized by hydrogen bonds  -  are slowly destroyed by occupation of “active sites” by water molecules. Chain degradation as well as disentanglement could be excluded. A molecular interpretation is given.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810406
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Amorceurs radicalaires fonctionnels, 1. Acides tert-butyldioxycarbonylbenzoïquesCe mémoire correspond à une partie de la thèse de Docteur-Ingénieur, soutenue le 23 Novembre 1978 à l'Université de Bordeaux I par Alain Ladousse. (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 891-901 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Among the methods to introduce functional groups in macromolecular compounds, the initiation of free radical polymerization by functional peroxyesters was investigated. m- and p-tert-butyldioxycarbonylbenzoic acids (3 and 8) were synthetized and their properties were studied. Differential scanning enthalpimetric study of the thermolysis kinetics of 3 and 8 led to the conclusion that these compounds are a little more stable than O,O-tert-butyl hydrogen monoperoxyphthalate (1). Thus, they could be applied under similar conditions. Solution and bulk polymerizations of styrene initiated by 3 or 8 were found to be efficient methods to obtain polystyrene substituted by carboxylic functions.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810410
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Amorceurs radicalaires fonctionnels, 2Partie 1: cf.1.. Macroinitiateurs à partir de l'α-hydrogeno-ω-hydroxypoly(oxyéthylène) et des acides tert-butyldioxycarbonylbenzoïquesCe mémoire correspond à une partie de la thèse de Docteur-Ingénieur soutenue le 23 Novembre 1978 à l'Université de Bordeaux I par Alain Ladousse. (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 903-911 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Modified polystyrenes were obtained by free radical polymerization of styrene using the macroinitiators α-tert-butyldioxyterephthaloyl(or phthaloyl)-ωtert-butyldioxyterephthaloyl(or phthaloyl)poly(oxyethylene) (3 and 4), which were synthetized. To examine the stability of such compounds, thermolysis kinetics of model compounds, OO-tert-butyl O-methyl monoperoxyphthalate (6) and terephthalate (7) were studied by differential scanning enthalpimetry. Suspension polymerization of styrene applying the industrial method, showed that the macroinitiator is able to initiate the process. A polystyrene containing up to 4% by weight oxyethylene units was obtained.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810411
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Polymer conformation and NMR chemical shifts, 2Part 1: cf.: 1.. Methoxyl protons NMR spectra of alternating copolymers of methyl (meth)acrylate with (α-methyl)styrene (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 931-940 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1H NMR spectra of alternating copolymers of methyl acrylate with styrene, methyl acrylate with α-methylstyrene, and methyl methacrylate with α-methylstyrene show triplet splittings at the methoxyl protons regions, which apparently reflect the cotacticity of triad sequences having a (meth)acrylate unit in the center. The two intervals between two neighboring peaks of the triplet are nearly equivalent for each alternating copolymer, whereas the absolute value of the splitting width is significantly different from one alternating copolymer to another. A theoretical interpretation is given for this observation by calculating the chemical shifts of the methoxyl protons in combination with a conformational analysis of the copolymers. The chemical shift of the protons in meso or racemic type dyad sequence is assigned by averaging the shieldings over all the preferred conformations for the dyad and is accumulated to give the shifts in triad sequences: iso = meso + meso, hetero = meso + racemic, syndio = racemic + racemic. The cotacticity-dependent splittings thus calculated are quantitatively in accordance with the observed spectra and discussed in terms of conformational variation of the copolymers depending on the presence of α-methyl group(s) in neither, either, or both of the monomeric unit(s).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810414
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Chlorination of polyethylene single crystals (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1051-1058 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chlorination under mild conditions of suspensions of polyethylene single crystals demonstrated that a selective attack on the fold surface takes place. Two polyethylene molecular weight fractions (Mn = 47000 and Mn = 150 000) were used and single crystals were grown isothermally from p-xylene at 88°C. The chlorine content was changed from 4 wt.-% to 30 wt.-% and to this level no evidence for crystal attack and loss of crystallinity was found. The melting temperatures of chlorinated single crystals decrease with increasing chlorination up to about 15 wt.-% chlorine content and then stay constant for higher chlorine contents. Moreover, the heat of melting of the chlorinated single crystals is constant and is independent of the chlorine content up to 25 wt.-%. These results are compared with those of samples of chlorinated polyethylene recrystallized from solution and from the melt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810509
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Two-Stage nature of crystallization in stretched cis-1,4-polybutadiene networks (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1143-1157 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystallization of cross-linked cis-1,4-polybutadiene, stretched at room temperature, is investigated by wide and small angle X-ray diffraction techniques, at temperatures ranging from -40°C to the melting point, Tm, and for extension ratios, λ, from 1 to 7,7. The experimental conditions adopted should approximate thermodynamic equilibrium. All the experimental findings, namely, crystallinity, preferred orientation of the crystalline and amorphous fractions, unit-cell dimensions and others, are consistent with the formation of two types of crystals: one depending mainly on stretching, the other on temperature. The former is characterized by extended chain crystals with Tm higher than the isotropic melting point (Tm0 = -3°C); the latter by a lamellar (bulk-like) morphology which is stable only below Tm0. A slight increase of Tm occurs for λ 〈 3, when the axes of the crystallized chains are tilted with respect to the strain direction; only when untilted crystals are formed (λ 〉 3) a remarkable increase of Tm is observed as a function of λ. As a qualitative interpretation, the two-fold crystallization mechanism is based on non-uniform extensibility of the segments included between adjacent junctions of the network.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810519
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Not all polyanions induce a J-band in the dye pseudoisocyanine (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1459-1467 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N,N′-diethylpseudoisocyanine chloride (PIC) forms compounds with various vinyl poly+ and DNA, but the shapes of the spectra of the dye-polyanion compounds depend on the nature of the polyanions. PIC forms compounds with 1:1 polyanion/dye stoichiometries with DNA (native and denatured), polymethacrylate and poly(styrenesulfonate); and the spectra of these compounds do not show any pronounced metachromasia or red-shifted J-band. Polyacrylate and poly(vinyl sulfate) form compounds with polyanion/dye stoichiometry of 2:1, and give spectra with extremely sharp and red-shifted J-band. This is the first report on the relation between the polyanion/PIC stoichiometry and the depiction of the J-band of the resulting compound.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810709
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Polymere charge-transfer-Komplexe auf der basis von polyvinylalkoholacetalen, 3Teil 2: cf.1. (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1495-1504 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new fluorene containing polymer, poly[2-(2-fluorenyl)-1,3-dioxan-4,6-diylmethylene] (3 or 4), and the corresponding model compound, 2-fluorenecarbaldehydetrimethyleneacetal (6) were synthesized. The fluorescence spectroscopy of the polymer in dilute solution indicates the formation of an intramolecular excimer. Charge-transfer complex formation with tetracyanoethylene (TCNE), 2,5-cyclohexadien-1,4-diylidenedimalonodinitrile (TCNQ), and 2,4,5,7-tetranitro-9-fluorenone (TENF) was studied by means of absorption spectroscopy.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810712
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Isotactic poly(allyl vinyl ether), 1Part 2: Cf.10.. A study of the polymerization and a proposal of a mechanism of stereocontrol (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2259-2266 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Allyl vinyl ether can be polymerized to highly isotactic polymer with SbCl5 in toluene at ca. -10°C. The stereospecificity is not significantly lower than that of polymer made at ca. -75°C; The reproducibility of the process is greatly improved at the higher temperature. BF3.O(C2H5)2 proved to be an ineffective initiator, in contrast with literature data. NMR analysis, previously published for diads only from NMR data, was performed (1H and 13C) for triads as well, and partly for hexads. No evidence for stereocontrol other than the relationship between active chain end HC⊕OAllyl and incoming monomer can be inferred1cf. Part 2 of this series10.. A simple mechanism, featuring association between incoming monomer and counterion, invoking only steric hindrance is proposed as an explanation of these findings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    An electron spin resonance study of radical transfer reactions in γ-irradiated vinylthiol/styrene-copolymers (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2293-2303 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Formation and behaviour of radiation induced free radicals in statistical copolymers from vinyl hydrosulfide and styrene (1:1, 1:4, and 1:10) were investigated by means of ESR spectroscopy. The corresponding homopolymers were also included in these studies. After γ-irradiation of the copolymers at 77 K and subsequent annealing to 293 K it was possible to detect thio radicals. Their relative yields were found to increase with increasing styrene content. Investigations regarding the thermal behaviour of the radiation induced radicals in the copolymers allowed the assumption of two mechanisms responsible for the formation of the thio radicals: First, the formation takes place via ion radicals located at the mercapto groups at 77K. In the copolymers the stability of the thio radicals is favoured by steric hindrance through the benzene rings thus reducing the formation of disulfide bridges as termination reaction. Secondly, the formation of the thio radicals is caused by a hydrogen transfer from the mercapto groups to the benzyl radicals and/or cyclohexadienyl radicals of styrene units.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Template polycondensation of active esters containing nucleic acid bases with diamines (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2325-2333 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Template polycondensations of di-p-nitrophenyl methylsuccinate derivatives of thymine (1) and theophylline (2) with piperazine and 4-aminomethylbenzylamine (4-ABA) were carried out in pyridine/methylene chloride and in DMF solutions. Polystyrenes containing adenine as a side group in various contents were used as template in this polycondensation. The polycondensation reactions of active ester 1 with diamines were effectively accelerated by the presence of the template in both solvents. On the other hand, the polycondensation reactions of active ester 2 with diamines were scarcely affected by the template under the same conditions. The maximum acceleration effect was observed in the presence of templates in which the adenine content is about 54% for the polycondensation of 1 with piperazine and about 25% for that with 4-ABA, respectively.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Polymerization of bicyclic acetals, 8Part 7: cf.7.. Cationic polymerization of 6,8-dioxabicyclo[3.2.1]oct-2-ene (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2315-2323 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(5,6-dihydro-2H-pyran-2,6-diyloxymethylene) (6), a new polyacetal having a dihydropyran ring in its repeating unit was prepared by selective ring-opening polymerization of 6,8-dioxabicyclo[3.2.1]oct-2-ene (5) at temperatures between -60 and -90°C in dilute methylene chloride or toluene solutions using boron trifluoride etherate as initiator. The resulting polymers, having a number average molecular weight up to 1,5 · 104, melted at 110 - 130°C and decomposed at ≈ 170°C in air. The isotactic dyad content of the polymers, estimated by 13C NMR spectroscopy, was found to be in the range of 70 to 77 mole-%, somewhat lower than that of its saturated analogue, poly(tetrahydropyran-2,6-diyloxymethylene), (2). The preferred formation of the isotactic sequence along the polymer chain is rationalized in terms of the enantiomer selection by the growing chain end control mechanism as previously proposed for the polymerization of 6,8-dioxabicyclo[3.2.1]octane, (1).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    On the molecular weight determination by vapor pressure osmometry (VPO), 2Part 1: cf.2.. Molecular weight average obtained by VPO (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2409-2411 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Provided that in molecular weight determinations by vapor pressure osmometry (VPO) the relationship between M and the measured quantity (δV/c)c=0 obeys a calibration function of the type (δV/c)c=0 = KM-a, the kind of molecular weight average M̄VPO delivered by this method is derived. The deviation of M̄VPO from the true number average molecular weight M̄n is estimated from its dependence on the polydispersity and the exponent a of the calibration function.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811119
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Long-lived polymer radicals, 2Part 1: cf.1.. An ESR study on the reactions of the propagating polymer radicals of N-methylacrylamide and N-methylmethacrylamide with vinyl monomers at room temperature (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2421-2431 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Acrylamide (AAm), methacrylamide (MAm), N-methylacrylamide (NMAAm) and N-methylmethacrylamide (NMMAm) were found to yield long-lived propagating polymer radicals in the photo-sensitized polymerizations in 1,4-dioxane or benzene. The concentration of poly(NMAAm) radicals reached 1.10-3 mol/l. Some post-effect was observed at room temperature in the photo-sensitized polymerization of AAm with di-tert-butyl peroxide in 1,4-dioxane, while no post-polymerization proceeded at room temperature in the polymerization of NMMAm in benzene. The reactions of poly(NMAAm) and poly(NMMAm) radicals with various vinyl monomers were found to produce long-lived propagating polymer radicals of the second monomers at room temperature. Polymer radicals of non-homopolymerizable monomers such as α-methylstyrene and 1,1-diphenylethylene were easily formed in such a block-copolymerization matrix. The formation of the propagating polymer radicals of the vinyl monomers was investigated by means of ESR spectroscopy.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Molecular weights and molecular weight distributions of poly(trimethylhexamethyleneterephthalamide) (trogamid T®)Herrn Prof. Dr. M. Seefelder zum sechzigsten Geburtstag gewidmet. (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2625-2636 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Molecular weights of Trogamid T® were determined by ultracentrifugation, light-scattering, osmometry and viscometry, molecular weight distributions by gel permeation chromatography (GPC) and five different fractionation methods. The separation efficiency of GPC with N,N-dimethylformamide as solvent was tested with three different types of gels, crosslinked polystyrene, porous glass and crosslinked poly(vinyl acetate), the last one yielding the best results. Solution fractionations show better results than precipitation methods. All fractionations gave far too small apparent non-uniformities. After correction according to the non-uniformities of the fractions the results corresponded to those of the other methods. All methods resulted in U = M̄w/M̄n - 1 = 0,7 for the technical product Trogamid T®. The discrepancy to U = 1 of a Schulz-Flory distribution can be explained by the influence of the path of reaction.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811218
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Synthesis of polydienes of controlled tacticity with new catalytic systems (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 4 (1981), S. 61-72 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The stereospecific polymerization of diolefins using new catalytic systems based on less conventional transition metal complexes is reviewed. In particular, two families of catalysts based on new complexes of π-allyl type of actinide and lanthanide elements, as well as three component systems formed by rare-earth metal alkoxides, aluminum alkyls, and a Lewis acid are described. A peculiarity of both actinide and lanthanide catalysts is their ability to give, at very low concentration, extremely high cis diolefin polymers and copolymers in aliphatic solvents.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020041981105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Recent advances in NMR techniques for the study of synthetic polymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 4 (1981), S. 117-127 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The value to polymer chemistry of certain recent developments in NMR is discussed. The techniques in question are: (i) high-field operation, (ii) multinuclear studies, and (iii) the dipolar decoupling/cross-polarization/magic angle rotation experiments on solids. Examples of polymer spectra obtained by these methods are given.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020041981109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    The structure of polyconjugated macromolecules (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 4 (1981), S. 155-175 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent experimental results concerning the crystal structure and morphology of nascent cis-poly-acetylene and pristine trans-polyacetylene are discussed. The unit cell data of cis-PA and two different modifications of trans-PA are reported. The chlorination and the hydrogenation of PA both of which give soluble derivatives under certain experimental circumstances are critically discussed. PA prepared by the Shirakawa technique has a lamellar morphology with some evidence for chain folding and not a fibirillar texture as sometimes assumed. The synthesis and spectral properties of polyenylanions and -cations are reported as a new class of polyconjugated macromolecules. The so-called doping of PA to produce highly conducting phases is explained as a chemical reaction giving rise to intermolecular CT-interaction.Finally, some new experiments concerning the solution properties of polydiacetylenes and the question of effective conjugation length in polyunsaturated polymers are discussed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020041981112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Infrared dichroism, molecular structure, and deformation mechanisms of isotactic polypropylene (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 4 (1981), S. 241-270 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared dichroism measurements can be used to study the process-structure-property relations of a polymer provided the transition-moment angle and phase absorption characteristics of the individual absorption frequencies are known. The present study describes experimental procedures for determining these intrinsic frequency characteristics using isotactic polypropylene as the semicrystalline polymer example. The study further demonstrates the use of this intrinsic information for characterizing the process-structure-property behavior of deformed isotactic polypropylene films. This reveals remarkable similarities in the observed structural response of isotactic polypropylene to different deformation processes.
    Additional Material: 32 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020041981117
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Stereoregular bioresorbable polyesters for orthopaedic surgeryLectured by Dr Michel Vert, Maitre de Recherche at the French CNRS. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 30-41 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The feasability of using poly(α-hydroxy-acid)s (poly-(glycolic acid), poly(L-lactic acid), L and D-lactic acid stereocopolymers and copolymers of glycolic and L- and D-lactic acids) for processing bioresorbable bone plates, screws, nails etc..., is questioned in regard to the requirements for effective applications and to the data reported in the open literature. Experiments carried out on home-made samples confirm the biocompatibility of these polyesters and the fast resorption of the amorphous compounds. In contrast, our results concerning crystalline poly(L-lactic acid) disagree with those of the literature. The discrepancies might result from differences in the basic material, differences in crystallinity and/or degradation of macromolecules which has been shown to occur sometimes during the elaboration of ready-for-implantation samples. Indeed, quasi-biostable bone plates based on isotactic poly(L-lactic acid) have been obtained according to an elaboration process which preserves the integrity of the synthesized macromolecules. The effects of enantiomeric purity and of implantation time on the tensile strength are reported for a series of welldefined stereocopolymers. Current studies show that highly isotactic poly(lactic acid)s (L/L+D 〉 92%) are polymers of particular interest for effective applications in bone surgery, especially for the construction of completely resorbable composite devices whose reinforcement consists of poly(glycolic acid) fibers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Photochemical and spectroscopic behavior of some liquid-crystal polymer systems (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 58-69 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis, characterization, and applications of liquid-crystalline polymers are emerging areas of scientific research. Lyotropic and thermotropic mesomorphic polymers are briefly reviewed, and the spectroscopic properties of solutes in liquid-crystal polymer hosts are discussed. The results of some photochemical investigations in ordered systems are described. Potential uses of liquid-crystal polymers are given.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Polymeric catalysts: A contribution to improve the ecology of chemical processes (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 155-178 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymeric catalysts can typically be considered as being a polymeric carrier, to which a catalytically active species - well known in homogeneous catalysis - has been attached in an appropriate fashion. This heterogenization of homogeneous catalysis is of increasing importance due to certain advantages with respect to the ecology of industrial chemical processes. It is the intention of this contribution to discuss two approaches thus illustrating the general statement more specifically. Approach one is the application of ion exchange resins, generally in their protonated form, to perform acid catalyzed reactions in a solid matrix. Approach two is the immobilization of whole, living microbial cells to be applied in heterogeneous biocatalysis.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Role of structure in transport across membranes (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 179-202 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Interactions between water and two polymers used in membrane technology which are cellulose acetate (39.8% acetyl content: CA) and poly-trans-2, 5-dimethyl piperazinthiofurazanamide (DMP-TFZ) are presented. Experimental adsorption isotherms are discussed on the basis of BET, Zimn, Flory-Huggins theories. DMP-TFZ shows a lower water cluster formation tendency than CA at low and mean activities. The state of water was studied also by IR: in both the polymers the adsorbed water stretching OH frequencies are shifted to higher values showing weaker H bonds than in water. This can be related to the existence of water in the state of monomer and small size aggregates and favours high mobility. The structure of CA dense films is amorphous to X rays, but a certain amount of crystallinity is revealed by DTA. DMP-TFZ is amorphous to X rays, has a high T and shows high stiffness to mechanical dynamical tests. The suggestion is made that stiff chain polymers which contain hydrophilic groups and which cannot easily crystallize, but can get a close packing, do not allow the formation of big free volume packets across which large size water clusters, able to solvate ions, can move.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Studies of static and dynamic aspects of spatial protein structures by high resolution nuclear magnetic resonance spectroscopy (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 234-252 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The potential of high resolution nuclear magnetic resonance (NMR) for many-parameter characterization of biopolymer conformation has long been recognized. Currently new NMR techniques for use in this field are in full development. In the present paper a survey of fundamental aspects of NMR studies of protein conformation is used as a basis for discussion of recently developed one-dimensional and two-dimensional NMR experiments for studies of proteins.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981115
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Polymeric onium salts as catalysts in preparative organic chemistry (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 82-106 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ammonium and phosphonium quaternary salts immobilized on organic and inorganic polymeric matrices are reviewed in relation to their main catalytic applications in preparative organic chemistry. Attention is paid to the systems active in heterophase anion-promoted reactions recognizable in the modern breakthrough created in conventional organic chemistry by the chapter of “phase-transfer” catalysis for its multivalent practical potential. After a mention of early applications in synthetic chemistry performed in the presence of conventional anion-exchange resins, examples of the reports that started to appear in the literature since 1975 on the specific topic of the title have been presented. In particular a rationalization of the specific catalytic activity in phase-transfer reactions has been attempted in terms of the structural parameters directly related to the polymeric matrix. This should not be considered only as a merely inert carrier because of its potential of affecting the specific rate of the overall process under the chemical and stereochemical point of view and defining its morphological and chemical integrity.
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Ion-chelating polymers carrying macrocyclic ligands (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 203-215 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The ion-chelating properties of linear and network polymers with crown ether and cryptand-type macroheterocyclic ligands either in the backbone or as pendent groups are described. Some of the materials have potential application in trace solute analysis, the removal of radioactive isotopes, separation of ions, the enrichment of isotopes, anion-activated catalysis in organic synthesis and other areas. The properties of the ligand-anchored polymers often differ from those of the monomeric ligands as a result of cooperative effects involving neighboring ligands or other chain substituents.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    The stereoselective and stereoelective polymerizations of some oxiranes (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 5 (1981), S. 230-233 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The mechanism of stereoregulation in polymerization reaction is discussed in terms of the two model cases: (i) the growing chain control mechanism, and (ii) catalyst control mechanism. These two mechanisms were observed to be operated in the stereoselective polymerizations of methyloxirane and of tert-butyloxirane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.020051981114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Kinetics of alkaline hydrolysis of polyacrylamide in solution by viscosimetric techniqueNCL Communication No. 2455. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1-8 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The alkaline hydrolysis of polyacrylamide in solution is studied viscosimetrically. The viscosity of the solution increases continuously during the course of hydrolysis. The relationship between intrinsic viscosity and the extent of reaction is established, using a series of polyacrylamides with known extents of hydrolysis. The extent of reaction is determined from the observed flowtime, using the relationship between [η] and extent of reaction. The second-order rate constant and the activation energy are in good agreement with those reported in the literature. A four-fold increased reactivity of the amide groups towards hydrolysis is observed at very low extents of hydrolysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Redox polymerisation, 5.Part 4: cf.8. Kinetics of the polymerisation of acrylonitrile and methyl methacrylate initiated by the system cyanoacetic acid-Mn(III)(acac)3 in DMF and DMSO (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 23-28 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymerisation of acrylonitrile and methyl methacrylate initiated by the system cyanoacetic acid-Mn(III)(acac)3 is investigated in DMF and in DMSO at 25-35°C. Kinetics of reduction of the complex by cyanoacetic acid shows the formation of a mixed ligand complex whose decomposition yields the primary radicals. Efficient initiation of polymerisation by these radicals followed by exclusive mutual termination accounts for the kinetics of polymerisation. Rate and equilibrium parameters are evaluated and their significance discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Lineare polybenzyle, 6.5. Mitteilung: vgl. J. Skura, R. W. Lenz, Polym. Bull. 2, 31 (1980). Polymerisation von α-methylbenzylchlorid (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 47-58 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: α-Methylbenzylchloride (1) was polymerized in ethyl chloride and in 1-nitropropane at various temperatures with AlCl3 as catalyst, mainly at -115 and at 0°C. The polymers obtained were crystalline or amorphous, depending on the reaction conditions. The reactions were complete within seconds. The tacticity of the polymers was determined by 1H and 13C NMR-spectroscopy. Polymers prepared at low temperatures in ethyl chloride showed isotactic sequences; in 1-nitropropane at 0°C atactic configuration. A reaction mechanism for the formation of the isotactic polymer is proposed on the basis of GPC-data. DSC-data are reported and discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Aromatic spiro polymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 59-70 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Aromatic spiro polymers, polyoxoindoline-spiro-benzimidazolines 9a-c, were prepared by the solution polycondensation reaction of biisatyls with aromatic tetramines in polar organic solvents. The spiro polymers were found to exhibit good solubility in polar organic solvents, such as N,N-dimethylacetamide and hexamethylphosphoramide, in contrast to the insolubility of the corresponding polyindoloquinoxalines in these solvents. The improvement of the solubility was discussed mainly in terms of the hydrogen bonding and packing in polymer molecules. The spiro polymers slowly rearranged at high temperatures to give polyindoloquinoxalines with high thermal stability.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Synthesis and photochemical behavior of polynuclear dithiolato-metal-dye complexesDedicated to Prof. Dr. Georg Manecke of the Free University of Berlin for his 65th birthday (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 105-112 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polynuclear dithiolato-metal-dye complexes were prepared and their photochemical behaviors were studied. The dimercapto ligands used were maleonitriledithiol (MNT) and toluene-3,4-dithiol (TDT); metal ions were copper, manganese and nickel; and dyes were thionine (TH), tolusafranine (SAF) and methylene blue (MB). From IR spectra, elemental analyses and magnetic measurements they were found to be polynuclear complexes having bis(dithiolato)-metal structure incorporating the dyes as cations. The complexes showed almost the same visible spectra as the free dyes. The molar absorption coefficients of the maximum absorption were in most cases larger than in the free dye. The dithiolato-metal complex affected remarkably the photochemical reactivity of the dye incorporated in it. The rates of the photochemical reduction of the TH complexes (Cu-MNT-TH, Mn-MNT-TH and Cu-TDT-TH) in hexamethylphosphortriamide were higher than the free TH, while those of the SAF complexes (Cu-MNT-SAF and Mn-MNT-SAF) and MB complexes (Cu-MNT-MB and Ni-MNT-MB) were much lower than the free SAF and MB, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820113
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    Immobilisierung von polymergebundenen oligodesoxyribocytidylsäuren an DEAE-celluloseFür die Nomenklatur der Nucleinsäurefragmente werden die Regeln der IUPAC Eur. J. Biochem. 15, 203 (1970) verwendet. TPS steht als Abkürzung für 2,4,6-Triisopropylbenzolsulfonsärechlorid, PVAL für Polyvinylalkohol, TEAB für Triethylammonium-hydrogencarbonatpuffer, DEAE-Cellulose für Diethylaminoethyl-Cellulose, QAE-Sephadex für Diethyl-(2-hydroxypropyl)-aminoethyl-cellulose, Tris für α,α,α-Tris(hydroxymethyl)-methylamin, HMPT für Hexamethylphosphorsäuretriamid. 1A260-Einheit ist die Menge bei 260 nm absorbierenden Materials, die, gelöst in 1 ml, eine Absorption von 1 hat. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 119-131 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N-Anisoyl-deoxyribocytidine-5′-phosphate is chemically polycondensed. From the polycondensate, oligomers containing four or more monomeric units are isolated chromatographically and subsequently linked to a soluble polyvinylalcohol. After cleavage of the nucleobaseprotecting groups, the unreacted oligodesoxyribocytidylic acids are separated from polyvinylalcohol bound oligomers through ultrafiltration. DEAE-Cellulose is subsequently coated with this polymer-bound oligodeoxyribocytidylic acids. The now obtained PVAL-p(dC)n-DEAE-Cellulose acts as a specific sorbent in template-chromatography.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820115
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    Investigation of the electrical conductivity of the iodine-polyphenylacetylene charge-transfer complex (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 165-176 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The electrical conductivity of the charge transfer complex between iodine and polyphenylacetylene (PPA) has been studied. The room temperature d-c conductivity (σ) increased by seven orders of magnitude with iodine addition, reaching a maximum of 10-5 Ω-1 · cm-1 for a 1:1 ratio of iodine to repeating unit, and its concentration dependence could be described by: σ = σ0 exp [γc(1-c) - γ/4], where c is the mole fraction of iodine. Both crystalline and amorphous cis-PPA followed this form, the crystalline polymer having a lower conductivity at low iodine levels, but attaining the same maximum value. The trans-polymer iodinated much less readily than cis-PPA. Molecular weight variations did not influence iodine uptake or conductivity in the range studied. It was possible to remove virtually all iodine from the charge-transfer complex in dynamic vacuum, and an iodine diffusion coefficient of D ≈ 10-11 cm2.s-1 was determined from the rate of weight loss. Passage of current resulted in the evolution of iodine and iodine compounds at the anode. The experiment is consistent with a predominantly ionic conduction mechanism, in which the strong concentration dependence of σ is associated with a concentration-dependent activation energy for ionic charge-carrier formation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820118
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Polymerization of 1,3-cycloheptadiene and the structure of poly(1,3-cycloheptadiene)s obtained by ionic initiators (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 215-217 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820123
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    The colour reaction between poly(vinyl alcohol) and iodine-iodide in the presence of orthotelluric acid (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 225-229 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820125
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Studies on carboxymethylcellulose: Potentiometric titrations, 3 (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 243-245 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820128
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    A new structure for polystyrene-polybutadiene block copolymers: A smectic E type structure (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 265-268 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820132
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    A new convenient method for the synthesis of poly(styrenesulfonic acid) (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 279-281 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820135
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Controlled release of fluoride ions from methacryloyl fluoride  -  methyl methacrylate copolymers, 1. Synthesis of methacryloyl fluoride  -  methacrylate copolymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 273-277 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820134
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Syntheses of polymeric cobalt dinitrogen complexes and reduction of the coordinated nitrogen (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 283-291 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymeric cobalt dinitrogen complexes were synthesized by two different methods: by the ligand substitution reaction of polymers 5a - c and 6a - c, containing 4-diphenylphosphinophenylethylene units (3) or 4-diphenylphosphinomethylphenylethylene units (4), respectively, with hydridodinitrogentris(triphenylphosphine)cobalt(I) (CoH(N2)(PPh3)3), or by the direct reaction of tris(acetylacetonato)cobalt(III) with triphenylphosphine, the polymers 5a - c or 6a - c, and triisobutylaluminium under nitrogen. The intensity of the vN2 band in the IR spectrum of the polymeric dinitrogen complex was found to be about four times as that of CoH(N2)(PPh3)3. Ammonia was formed after hydrolysis of the complex, which was prepared by mixing a tetrahydrofuran solution of naphthaline, lithium, and titanium tetrachloride with the polymeric dinitrogen complex. The yields of ammonia in the case of the polymeric complexes were high in comparison with that obtained with CoH(N2)(PPh3)3. The highest yields of ammonia were obtained when a mole ratio [P̄]/[Co] 〈 1 ([P̄] is the concentration of phosphino groups in the polymer and [Co] is that of Co in CoH(N2)(PPh3)3), a temperature of -20°C, and a reaction time of 1 h were applied.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820201
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Synthesis and conformational study of poly(L-valyl-L-valyl-∊-N-benzyloxycarbonyl-L-lysine) in the solid state and in solution (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 549-557 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High molecular weight poly(L-valyl-L-valyl-∊-N-benzyloxycarbonyl-L-lysine) (PVVZL) (7) was obtained by condensation in dimethyl sulfoxide of the L-valyl-L-valyl-∊-N-benzyloxycarbonyl-L-lysine p-nitrophenyl ester, synthesized by the DCCStandard abbreviations for amino acid derivatives and peptides are used according to the I.U.P.A.C.-I.U.B. Commission on Biochemical Nomenclature, Biochemistry 11, 1726 (1972). The abbreviations used are: Boc = tert-butyloxycarbonyl; Z = benzyloxycarbonyl; OBzl = benzyl ester; H-Val-OH = valine; H-Lys-OH = lysine; HONp = para-nitrophenol; DDC = dicyclohexylcarbodiimide; DMSO = dimethyl sulfoxide; TFA = trifluoroacetic acid; TFE = 2,2,2-trifluoroethanol; CD = circular dichroism; IR = infrared spectra. method. The conformation of 7 was studied in the solid state and in solution of 2,2,2-trifluoroethanol, acetonitrile-trifluoroethanol and dioxane-trifluoroethanol mixtures by X-ray diffraction method, CD and IR spectroscopy. The results obtained in the solid state suggest the presence of β-structure, whereas in trifluoroethanol solution, at least, a mixture of random coil and β conformation, probably occurs. The aging of the solution seems to give rise to a higher content of β-structure. The addition of acetonitrile and dioxane favours the formation of an increasing amount of β-structure. Therefore, the conformational behaviour of 7 is similar to that of other sequential polypeptides containing valyl residues, which seem to promote the β-structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820221
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    Small angle neutron scattering of molten n-alkane/polyethylene mixturesPresented at the Hamburg Macromolecular Symposium, September 16 - 18, 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 583-587 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820225
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Spinodale Entmischung von Defekten in Nadelkristallen aus isotaktischem PolypropylenVorgetragen auf dem Hamburger Makromolekularen Symposium 16. - 18. September 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 613-619 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820229
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    Herstellen von Hochmodulfäden aus PolyethylenVorgetragen auf dem Hamburger Makromolekularen Symposium 16. - 18. September 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 637-642 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820232
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    The configurational characteristics of conventional poly(methyl methacrylate) in acetonitrile (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 445-449 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The θ-temperature and viscosity constant K0 of radically initiated poly(methyl methacrylate) in acetonitrile were determined from the intrinsic viscosity data (θ = 28°C, K0 = 4,3 · 102 g-3/2 · mol1/2.cm3). The unperturbed coil dimensions are lower in acetonitrile than in other θ-solvents at comparable temperature and indicate a more compact conformation of poly(methyl methacrylate) molecules. The discrepancies in the reported data of the θ and K0 values are elucidated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820215
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    Messungen zum Aggregationsverhalten perfluorierter AlkansäurenHerrn Prof. Dr. M. Seefelder/BASF zum 60. Geburtstag (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 451-481 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: With the use of various techniques an attempt was made to characterize the aggregates that exist in micellar surfactant solutions of salts of the perfluornonanoic acid. The cmc values of the investigated systems were determined by conductivity and surface tension measurements. Conclusions about the shape of the micellar aggregates were drawn from rheologic and electric birefringence measurements. For the lithium, the ammonium and the tetramethylammonium surfactants the existence of normal micelles with spherical shape and with all surfactant ions lying at the micellar surface was found. The perfluornonanoate surfactants with the ammonium counterions that are partially substituted by alkyl groups showed in all investigations a behaviour that was different from the normal case. It was postulated that these solutions contain emulsion-droplet-like giant micelles with the surfactant ions and counterions solubilized as ion pairs in the interior of the micelles. Some of these giant micelles do not have spherical shape; these solutions showed electric birefringence. In most cases the giant micelles disappeared at higher temperatures. Only normal small micelles with spherical symmetry could then be detected and the measured values were again in the range for values of normal C8-perfluordetergents. On the basis of the investigated systems reasons and models for the formation of giant micelles are discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820216
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Application of electrostatic persistence length to polyelectrolyte solutions (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 559-568 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effects of added simple salt and polyion charge on the chain flexibility of an alternating copolymer of isobutyl vinyl ether and maleic acid are analyzed. The persistence length of this polymer in aqueous NaCl solution is calculated from sedimentation and viscosity data on the basis of a worm-like chain model. It is found that this polymer is in the state of a highly expanded conformation at low ionic strength, exhibiting a semi-rigid macromolecular behaviour and that it behaves like a rather coiled polymer with small persistence length at high salt concentration. The electrostatic persistence length calculated from the theory of Fixman et al. shows a \documentclass{article}\pagestyle{empty}\begin{document}$ 1/\sqrt {C_{\rm s} } $\end{document}-dependence on added salt concentration Cs.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820222
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Effect of adjacent functional groups on the electron-donor-acceptor complex formation of diethyl 2,2-bis(dinitrobenzyl)malonates and 2,2-bis(4-dimethylaminobenzyl)malonate (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 739-748 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to study the effect of adjacent functional groups on electron-donor acceptor (EDA) complex formation, the following donor or acceptor compounds were synthesized: diethyl 2-(2,4-dinitrobenzyl)malonate (13), diethyl 2,2-bis(2,4-dinitrobenzyl)malonate (14), diethyl 2-(3,5-dinitrobenzyl)malonate (5), diethyl 2,2-bis(3,5-dinitrobenzyl)malonate (6), diethyl 2-(4-dimethylaminobenzyl)malonate (10), diethyl 2,2-bis(4-dimethylaminobenzyl)malonate (11). The acceptor compounds 5, 6, 13, and 14 were complexed with N,N-dimethyl-4-dimethylaminoaniline (1) as donor, and the donor compounds 10 and 11, with 1,3,5-trinitrobenzene (2) as acceptor. The wave length of the absorption maximum (λmax), the association constant (KCT), the enthalpy (δH), and entropy (δS) of these EDA complexes were determined. It was found that λmax of complexes 6-1 and 11-2 show a bathochromic shift compared with complexes 5-1 and 10-2, and the values of KCT, -δH, and -δS are higher. The value of λmax for complex 14-1 is not different from that of complex 13-1, and the values of KCT, -δH, and -δS are lower. It was concluded that the stability of the EDA complexes of the 2,2-dibenzylmalonate derivatives 6, 11, and 14, is influenced by π-electron interaction between the adjacent two benzene rings.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820304
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Préparation d'adsorbants chromatographiques plurifonctionnels et asymétriques. Application à la purification de la céphalosporine C (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 763-771 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Some asymmetric and polyfunctional stationary phases were prepared by attachment of the ε-amino group of L-lysine copper complex to crosslinked polystyrene or agarose, substituted or not by hydrophilic spacer arms. After copper elimination, the sorbents exhibit three functions, one of a carboxylic acid and one of an α-primary amine, and moreover one of a secondary amine located at a variable distance far from the asymmetric carbon, but near the backbone of polymer. These sorbents were tested in the chromatographic extraction of cephalosporin C (1) from an aqueous mixture containing several α-amino acids. They exhibit an affinity higher for the antibiotic than for the amino acids and even for the dicarboxylic amino acids.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820307
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Synthesis and electrical properties of monomeric and polymeric iron-phthalocyanines (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 811-816 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A set of experimental conditions are described for the synthesis of monomeric and polymeric iron-phthalocyanines and compared with those reported in the literature. The dielectric constant and resistivity of characterised samples are studied as a function of temperature. The data indicate possible transitions at 90 and 180°C for monomeric iron-phthalocyanine whereas polymeric iron-phthalocyanine shows no breaks.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820311
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Graft copolymerization of methyl methacrylate on chlorinated natural rubber, 1. Initiation by various organometallic complexes (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 843-851 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Metallic compounds able to abstract chlorine atoms are investigated for initiating the graft copolymerization of methyl methacrylate on chlorinated natural rubber. An improved method for the separation of the side homopolymer from the graft copolymer is described. The cumulative results demonstrate the greater graft efficiency of the new initiating systems than of the usual free radical initiators.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820315
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Katalysatoren beim thermischen Abbau von Polymeren, 1. Über den katalytischen Abbau von Polypivalolacton (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 867-871 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The ability of different metal oxides and acetates to catalyze the thermal degradation of poly(pivalolactone) into cyclic oligomers has been investigated. Magnesium oxide was found to be the most active catalyst which converts poly(pivalolactone) completely into oligomers within less than two hours at 547 K. The influence of temperature and catalyst concentration and the distribution of cyclic oligomers is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820318
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Overall and individual effects in systems including organolithium compounds (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 911-915 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Experimental and quantum chemical data are used for the problem of the relative rǒle of individual factors considering the overall effects which are characteristic of certain Licontaining systems. Recourse is made to the following processes: polymerization of isoprene in the presence of subcatalytic amounts of electron donors; polymerization of acrylonitrile by RLi and ROLi initiators; polymerization of dienes by butyllithium (n-BuLi) and tert-butyllithium (tert-BuLi).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820321
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Adiabatic polymerization of ε-caprolactam in presence of lithium chloride, 1. Thermodynamic and Kinetic aspects (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 929-939 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The activated anionic polymerization of ε-caprolactam in presence of LiCl (up to 10 wt.-%) is studied under quasi-adiabatic conditions. The temperature increase of the system, after proper corrections for the heat exchange with the surroundings, allows to evaluate the enthalpies of polymerization δHp and to correlate their variations with the specific interactions of LiCl with monomer and polymer. The sharp decrease of -δHp as function of LiCl content is attributed to the stabilizing effect of the ion-dipole interactions, which is higher for the monomer-salt pair than for the polymer-salt mixture. The initial rates of polymerization are enhanced by a few percents of added LiCl, with a maximum at about 3 wt.-%. The relative influence of various physical factors on the polymerization kinetics and thermodynamics is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820324
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Polymerization of tetrahydrofuran by bifunctional cationic initiators: Terephthaloyl perchlorate (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 731-737 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics and mechanism of the polymerization of tetrahydrofuran with terephthaloyl perchlorate in methylene chloride or cyclohexane were analyzed. This polymerization produces dicationically active polymers and takes place without induction period. Propagation in both solvents proceeds as a reaction being first order in monomer, and it changes with the polarity of the solvent because ionic and covalent species take part with different growing rates. The macroester mole fractions in cyclohexane and methylene chloride are 0,99 and 0,86, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820303
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Recherche de télomères à activité pharmacologique potentielle, 2Partie 1: cf.25.. Télomères de l'acide acrylique et greffage de composés hydroxylés (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 773-784 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Several telomers of acrylic acid with carbone tetrachloride were prepared. Their average degree of polymerization, which was between 10 and 50, was determined by several analytical methods (elemental analysis, viscosimetry, and GPC). From the kinetic equations of telomerization a relation between DPn of these telomers and the experimental conditions is established. Fixation of hydroxylic compounds through direct esterification was studied and it was found that the prepared telomers can be used as hydrosoluble carriers for drugs containing primary alcohol or phenol functions.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820308
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Polymers containing enzymatically degradable bonds, 1. Chymotrypsin catalyzed hydrolysis of p-nitroanilides of phenylalanine and tyrosine attached to side-chains of copolymers of N-(2-hydroxypropyl)methacrylamidePresented at the 25th IUPAC Symposium on Macromolecules, Mainz, FRG, September 1979. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 799-809 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of copolymers of N-(2-hydroxypropyl)methacrylamide were prepared, which contained side chains of the general formula -Gly-X-Y-NAp, where Gly ¨ glycine; X ¨ glycine, alanine, β-alanine, valine, leucine, isoleucine, phenylalanine; Y ¨ phenylalanine or tyrosine; NAp ¨ p-nitroanilide, the latter modelling biologically active compounds. The rates of chymotrypsin-catalyzed hydrolysis of p-nitroanilide groups at pH = 8,0 and 25°C were determined over a range of substrate concentrations to derive values for kcat and KM. The results allowed us to determine the influence of the structure of side chains on the rate of cleavage of Y-NAp. The increase in the susceptibility to chymotrypsin attack with an increasing spacing of the Y-NAp residue from the backbone of the polymer chains is demonstrated by comparing the kinetic data of copolymers containing -Gly-Gly-Phe-Phe-NAp, -Gly-Gly-Phe-NAp and -Gly-Phe-NAp side chains. Results obtained with α-chymotrypsin were compared with the cleavage of the above polymer substrates with chymotrypsin covalently bound to a copolymer of N-(2-hydroxypropyl)methacrylamide.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820310
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Synthesis and properties of aromatic polypyrazoles from bis(β-substituted vinyl ketones) and aromatic dihydrazines (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 837-842 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polycyclocondensations of aromatic dihydrazines 2a and 2b with 1,6-diethoxy-1,5-hexadiene-3,4-dione (1a) in m-cresol and those with bis(3-chloroacryloyl)benzenes 1b and 1c in 1-methyl-2-pyrrolidone (NMP) lead to aromatic polypyrazoles 3a - f having inherent viscosities up to 0,35 dl.g-1. The polymers are soluble in polar aprotic solvents like NMP and some acidic media including m-cresol. Thermogravimetry shows a loss of 10 wt.-% at ≈ 500°C both in air and nitrogen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820314
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Synthesis of polyamides containing 4,4′-azodibenzamido unitsPaper presented at the International symposium on“New Frontiers in Polymer Science and Polymer Applications”, held at Madras (1980). (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 853-859 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Four coloured polyamides containing azo-p-phenylene units were synthesised from 4,4′-azodibenzoic acid and four aromatic diamines employing both interfacial and solution polymerization procedures. The polymers were characterized by their UV and IR spectra, by inherent viscosity measurements and by solubility data. The stability in conc. sulfuric acid and the thermal behaviour are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820316
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Caractérisation texturale de résines en milieu réactionnel (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 873-882 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermoporometry, a method based on the microcalorimetric analysis of liquid-solid state transformation inside porous substances, gives access to porous volume versus pore size distribution. For the first time, this method is applied to the analysis of flexible products swellable in the reference medium. Conditions for applying transposition thermoporometry to this new class of porous substances are discussed. An example is given, which leads to suggest a model for the swelling process of a macroporous resin. Generalization of this method would induce a major progress in the study of swollen systems and enable better understanding of their structures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820319
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Subkatalytische Effekte in Systemen Isopren/Organolithium/Elektronendonator, 3Teil 2: cf1.. System Isopren/Oligoisoprenyllithium/1,2-Dimethoxyethan (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 917-920 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Molecular weights and structural characteristics of the polymers formed in the system isoprene/oligoisoprenyllithium (OILi)/1,2-dimethoxyethane (DME)/hexane (mole ratio DME/OILi = 0,01) for various conversions at -30°C were determined. The results obtained corroborate the former conclusion that the complexation of an electron donor with the monomeric form of the growing chain reduces the reactivity of the latter.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820322
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Polymethacrylic acid Derivatives, 1. Preparation, Characterization, and Potentiometric study of poly(N-methacryloyl-L-alanine-co-N-phenylmethacrylamide) (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 949-963 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(N-methacryloyl-L-alanine) and poly(N-methacryloyl-L-alanine-co-N-phenylmethacrylamide) containing up to 38 mole-% of N-phenylmethacrylamide were synthesized by radical copolymerization. These polymers were characterized by UV and IR spectroscopy and by conductimetric titrations. The samples were then studied by potentiometric titrations in pure water and in aqueous organic solvents, in the temperature range of 5 - 65°C. The experimental results show that, opposite to poly(methacrylic acid), poly(N-methacryloyl-L-alanine) takes no compact structure in water. The insertion of N-phenylmethacrylamide induces the appearance of this compact structure over 15 mole-% of this residue. Thereafter, the stability of the compact structure increases when increasing the amount of N-phenylmethacrylamide. Experimental results suggest that it is due to increasing Van der Waals interactions between the hydrophobic side chains.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820326
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Lamellar crystalline structure of block copolymers with an amorphous and a crystallizable block: Effect of the nature of the crystallizable block (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 989-995 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Block copolymers of styrene and ethylene oxide (SEO) and of styrene and ε-caprolactone (SCL), in the dry state and in the presence of a preferential solvent of the amorphous block, exhibit a lamellar crystalline structure at temperatures below ≈50°C. In this structure the crystallized chains are folded in two superposed layers. To investigate the effect of the nature of the crystallizable block, two copolymers SEO and SCL of the same relative molecular mass and composition were studied by X-ray diffraction and differential scanning calorimetry. It is established that the nature of the crystallizable block influences the crystallinity and the number of folds of the crystallized chains and the swelling of the amorphous polystyrene block.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820329
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Versuche zur umsetzung von methylendiphenolen mit glucosederivaten und zur kondensation von O-phenylglucosidderivatenHerrn Prof. Dr. Gustav Stählin, Universität Mainz, zum 80. Geburtstag gewidmet. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1351-1361 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Attempts to apply known methods of glucosidation to oligo[(hydroxyphenylene)methylene]s were not satisfying. The reaction of 4,4'-dimethyl-2,2'-methylenediphenol (1a) with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide gave a monoglucoside in 11% yield. A second attempt, the condensation of suitable O-phenylglucoside derivatives was unsuccessful. From a series of O-phenylglucosides (4) only 4-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyloxy)benzylbromide could be condensed with O-(4-hydroxymethylphenyl)-2,3,4,6-tetra-O-acetylglucopyranose to the corresponding diglucoside of 4,4'-oxydimethylenediphenol (7). Condensation reactions of the O-phenylglucoside 4k, to obtain an O-glucosidized poly[(hydroxyphenylene)methylene], were accompanied by decomposition. The results showed that the usual methods of the preparation of glucosidized phenols cannot be transferred to oligomeric or polymeric derivatives.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820506
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    The anionic polymerization of 2-pyrrolidone in bulk and in suspension (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1399-1405 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study on the anionic polymerization of 2-pyrrolidone in bulk and suspension under isothermal conditions is described. After a discussion about the disadvantages of the bulk process carried out by using N-potassium-2-pyrrolidone as initiator and N-acetyl-ε-caprolactam as activator, a possible alternative way is proposed on the basis of the suspension polymerization initiated by N-potassium-2-pyrrolidone and activated by silicon tetrachloride. The ultraviolet absorption spectra of the polymer samples obtained by the above methods reveal that undesiderable side reactions leading to degradation of the keto amide groups, are almost negligible under the aforementioned conditions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820512
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Changes of molecular weights of thermally exposed polymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1441-1447 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Theoretical relations between the change of molecular weights of thermally exposed polymers with arbitrary initial distribution and time have been derived. These relations were used to correlate the changes of molecular weights of thermally exposed polypropylene.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820516
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Solid phase photoreduction of methylviologen on cellulose (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1111-1118 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Methylviologen (1,1′-dimethyl-4,4′-bipyridinium dichloride, MV2+) absorbed on cellulose paper can be reduced photochemically in solid phase. The ESR spectrum (singlet; g = 1,967, ΔHmsl = 13,5 gauss) shows the photochemical formation of its cation radical (MV•+). The MV•+ formed on cellulose is unusually stable against oxidation by oxygen. Photochemical formation and slow oxidation of MV•+ under air occur fairly reversibly. The concentration of MV•+ and the optical density (O.D.) at 620 nm show a linear relationship. The concentration of MV•+ at 1 O.D. corresponds to 1,07.10-8 spins/cm2 cellulose paper. The formation of carbonyl groups in MV2+/cellulose after irradiation indicates that cellulose acts as electron donor. The mechanism of the solid phase photoreduction is discussed in relation to the effect of other carbohydrates or inorganic materials as adsorbents.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820411
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    A theoretical study on the 1H NMR chemical shift of alanine oligopeptides (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1097-1109 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: All the NH and α-CH proton chemical shifts of alanine oligopeptides (Ac-(Ala)n-NHMe, where n = 1-6) with extended and α-helical conformations and anti-parallel β pleated-sheet structure, were calculated by taking into account the magnetic anistropy effect due to the C=O and two kinds of C—N bond anisotropies, and the electric-field effect. The observed spectral behavior of the NH or CH protons in Ac-Ala-NHMe and Ac-(Ala)2-NHMe could be mostly predicted from the calculation, which indicates that the NH and CH chemical shifts in these oligomers are mainly determined by the intramolecular shielding effect. On the other hand, the appearance of the “doublet α-CH peak” for oligomers with chain lengths of five or more reported by Goodman et al. could not be interpreted in terms of the intramolecular shielding effect. In this case, therefore, whether the CH protons are shielded from the solvent or not, seems to be a dominant factor for the origin of the “doublet peak”. The magnetic anisotropy effect of a peptide group was also examined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820410
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Polybutadiènes hydroxytéléchéliques, 4.Partie 3: Cr. Fages, Q.-T. Pham, Makromol. Chem. 180, 2435 (1979). Microstructure des polybutadiènes hydroxytéléchéliques radicalaires observée par 1H NMR à 350 MHz et mécanismes de propagation (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1167-1176 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The examination by 1H NMR spectroscopy at 350 MHz of commerical hydroxytelechelic polybutadienes Arco R45M® allows the quantitative determination of the in-chain vinylcentered triads and the 4 types of hydroxylated vinyl chain ends. Vinyl primary radicals as well as macroradicals were found to propagate with penultimate and pen-penultimate effects.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820417
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Polymérisation anionique de l'acroléine, 2.Partie 1: cf.1. Influence de la nature du contre-ion et de la température sur la cinétique de la réactionTexte de la communication présentée à l'IUPAC de Mainz, septembre 1979. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1215-1227 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In tetrahydrofuran, with Na+ and Li+ as counter-ions, the kinetic order of the anionic polymerization of acrolein is unity for monomer and for initiator. These results indicate that the living ends are not associated at the studied concentrations of initiator. The polymerization rate depends on the nature of the counter-ion. Transfer reactions to monomer do not affect the polymerization rate but greatly change the molecular weights Mn of polyacroleins. The experimental M are much lower than the theoretical M. The propagation constants kpr and the transfer constant hm are determined using these experimental values of M. From these results, we can conclude that with Li+ as counter ion, transfer reactions are much more numerous than with Na+. Furthermore, the polymerization rate increases with temperature. The activation energies of the propagation (Ea,pr) and transfer reactions (Ea,t) can be determined separately. When the temperature increases the propagation reaction is promoted in comparison to the transfer reaction to monomer, and simultaneously transfer reactions to polymer take place. This last phenomenon restricts the upper value of the polymerization temperature.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820421
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Oxydation photocatalytique des polypropylènes isotactique et atactique (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1229-1241 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By photooxidation of isotactic and atactic polypropylene (PP), irradiated at wavelengths 〉300 nm in air, alcoholic, acidic, ester, lactonic, and unsaturated functions are formed as shown by IR spectrophotometry. The primarily formed hydroperoxy and ketone groups are rapidly photolyzed and their concentrations are kept low. In presence of UV absorbing pigments like TiO2 or ZnO, the same photoproducts are formed with lower rates than in the transparent polymers. In atactic PP, ZnO and TiO2 (rutile or anatase) show different photoactivities. When the light is absorbed in ZnO, accumulation of ketone and lactonic groups is observed. When TiO2 is the absorbing species, oxidation is going further and acidic, ester, and lactonic functions may be observed; TiO2 appears to be able to photocatalyze the disappearance of ketone groups. In isotactic PP of high cristallinity, direct photooxidation and photocatalyzed oxidation are superimposed and differences between ZnO and TiO2 cannot be observed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820422
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Effect of solvent on 13C NMR chemical shifts of tetrad methylene carbons of poly(vinyl chloride) (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1243-1251 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The 13C NMR chemical shifts of tetrad CH2 carbons of poly(vinyl chloride) are observed in solvents covering a wide range of relative dielectric constants and show extreme sensitivity to the solvent. The chemical shifts are interpreted theoretically by means of the solvaton-CNDO/2 MO theory.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820423
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Synthesis and tumor-inhibiting activity of new heparin-bound nitrogen mustard analogues (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1679-1683 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: New nitrogen mustard analogues in which bis(2-chloroethyl)-amino groups are separated by oxyethylene groups, 1,14-dichloro-3,12-bis(2-chloroethyl)-3,12-diaza-6,9-dioxatetradecan (3c) and 1,17-dichloro-3,15-bis(2-chloroethyl)-3,15-diaza-6,9,12-trioxaheptadecane (3d), were synthesized by reaction of bis(2-hydroxyethyl)amine (2) with bis(2-chloroethyoxy)ethylene (1a) and with 1,11-dichloro-3,6,9-trioxaundecane (1b), respectively, followed by treatment with thionyl chloride. The analogues were then complexed with heparin. The resulting heparin-complexes show inhibiting activity against transplanted Sarcoma-180 A in mice.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820608
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Cosolvents of PMMABased on a Communication presented to the IUPAC International Symposium on Macromolecules, Florence (Italy), September 7 - 12, 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1705-1714 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Several cosolvent mixtures for PMMA are reported. Their cosolvency has been confirmed by studying phase separation temperatures as a function of solvent composition. The results show that they are very powerful cosolvents. Acetonitrile forms such cosolvent mixtures with compounds containing different chemical groups (ester, ketone, alcohol, chloroalkane). The mixtures of acetonitrile with alcohols are nonsymmetrical with respect to the solubility parameter value of PMMA. They cannot be explained by simple δ theory. The mixture of formamide with ethanol is also nonsymmetrical and constitutes a true cosolvent pair for PMMA. The associating tendency of the polymer in the single solvent, plus the somewhat ordered structure of the pure liquids, are invoked to suggest that cosolvency is attained by breaking such order and association (in addition to the existence of unfavourable interactions between the cosolvents).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820611
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Ion-trapping in cationic polymerization, 2.Part 1: cf.1. Relative rates of trapping and relative chemical shifts for structurally differing phosphines as trapping agentsPresented in part at the IUPAC Macromolecular Symposium in Mainz, September 1979. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1735-1742 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The reaction of ethyl trifluoromethanesulfonate with phosphines to form phosphonium salts was used as a model reaction for the “trapping” of the various propagating species by phosphines in the polymerization of THF and other cyclic ethers. In dichloromethane at 25°C, the values of the bimolecular rate constant ktr were determined for various phosphines. For (C6H5)3P:5.10-3 mol-1.l.s-1, for (C6H5)(CH3)2P:0,22 mol-1.l.s-1, for (C6H5)(n-C3H7)-(CH3)P:0,13 mol-1.l.s-1, and for (n-C4H9)3P: 1,3 mol-1.l.s-1. It was found that the ratio ktr/ka (ka is the rate constant of the ethylation of THF by ethyl trifluoromethanesulfonate) changes from 40 for triphenylphosphine to 104 for tributylphosphine. Differences of chemical shifts, measured for various quaternary phosphonium cations differing in one substituent, were observed for ions with various substituents (e.g. based on parent methylpropylphenylphosphine).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820614
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    Einfluß des temperns auf die negative thermische ausdehnung von polyethylen (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1787-1799 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The linear thermal coefficient of expansion for high density polyethylene, extended to draw ratios λ = 8 to 16 is α = -24·10-6 K-1 at 20°C. This value results from the orientation of crystallites with an expansion coefficient αc = -12·10-6 K-1 and from stresses in the amorphous phase. Using the model of series coupling of crystalline and amorphous parts the value αam ≤ -50·10-6 K-1 is calculated for a crystallinity xv = 70%. From measurements of Young's modulus the fraction of tie-molecules χtie = 0,4% of the sample is assessed and the expansion coefficient αtie = -90·10-6 K-1. Annealing of the samples leads to shrinkage while the density ρ increases slightly and the expansion coefficient α increases considerably. Samples annealed at temperatures closely below the melting point show a slight decrease of the density at 20°C but a value of α exceeding that of isotropic samples. This effect can be explained by preferred orientation of the crystal a-axis in fibre direction as soon as orientation starts to break down.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820619
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Long-term change in conformation of macromolecules in solution, 2.Part 1: cf.1. Poly(acrylamide-co-sodium acrylate)sPaper in part presented at the International Symposium on Macromolecules (IUPAC), Florence (Italy) on Sept. 7 - 12th (1980). (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2277-2287 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The solution viscosity of aqueous poly(acrylamide-co-sodiumacrylate)s decreases with time in the scale of weeks. This unusual viscosity loss has been investigated by viscometry and by light scattering on high purity copolymer samples with different ratios of the components.  -  No viscosity loss can be observed in NaCl solution of high enough salt concentration. From the experiments it is concluded that a conformational change causes the viscosity decrease. No chain scission occurs. Light scattering measurements were used to directly confirm this hypothesis.  -  The viscosity loss may be caused by a conformational change of single molecules involving hydrogen bonds and can be interpreted as a transition from a partly stiffer, higher viscous structure to a more flexible one. As the driving force for the conformational change the entropy is discussed. The pronounced time dependence may be interpreted by a cooperative effect of loosening and combining of hydrogen bonds.  -  A similar behaviour has been observed earlier in aqueous poly(acrylamide) solutions. Thus, for some water soluble polymers one has to be aware of a time dependent parameter.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820817
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Carbon-13 relaxation study of crosslinked gels of poly(methyl methacrylate) (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2289-2295 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The motion of covalently crosslinked gels of poly(methyl methacrylate) (PMMA) swollen by benzene-d6 was studied by means of 13C NMR spectroscopy. The dependence of the segmental motion of PMMA on stereosequence was not affected by the presence of the covalently crosslinked part in the chain; isotactic sequence was more mobile than syndiotactic sequence. The spin-lattice relaxation times, T1's, for all the 13C nuclei of PMMA swollen with benzene (benzene content, 90 wt.-%, 0,01 mole-% of crosslinking) were considerably longer than those observed for the linear PMMA (benzene content, 75 wt.-%). Moreover, all the T1 values decreased with increasing of the degree of crosslinking, regardless of the crosslinking agent and reached to the values of T1 observed for uncrosslinked PMMA or to slightly larger values when the content of crosslinking agent was 1 mole-%. However, the nuclear Overhauser enhancement data were essentially independent of the degree of crosslinking within experimental error.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820818
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Polymérisation anionique de l'acroléine, 3.Partie 2: cf.9. Analyse des microstructures par 1H NMR et 13C NMR et mécanisme de polymérisation (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2321-2342 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have synthesized anionic polyacroleins using various initiators (naphthalene complex, tert-butyllithium) in different solvents (tetrahydrofuran, toluene). We have studied the 1H NMR and 13C NMR spectra of the polymers and assigned monomeric units and diads by comparison with spectra of four compounds corresponding to the different microstructure arrangements. By this method, we have clearly proved the presence of 1,4- as well as 3,4- and 1,2-units. But numerous cyclisations occur on the 1,2-units. Using only the 1H NMR method, a first estimation of the microstructure was obtained. 13C NMR gave further information and permitted the estimation of the (1,4-cis)/(1,4-trans) ratio. Furthermore the presence of hydroxyl groups along the chains has also been established. A satisfactory determination of the 1,2,3,4- and 1,4-structure percentages of several polyacroleins has been obtained using 1H NMR and 13C NMR simultaneously. A mechanism of acrolein polymerization, based on two different living ends is proposed. The microstructure indicates the existence of several complexation phenomena. When the living end/metal and monomer/metal complexations are weak (with Na+ e.g.), the polymer consists mainly of 1,4- and 3,4-units. On the other hand, with Li+, the microstructure has a high 1,2-content. Moreover, the living end/Li+ complexation would decrease with the chain length, because of the increasing attraction of the cation by the other complexing sites on this chain.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820821
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Linear oligopeptides, 78.Part 77: cf.1. The effect of the insertion of the proline residue on the solution conformation of host peptides (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2007-2014 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The conformational properties of three series of monodispersed, chemically and optically pure, PEGThe following abbreviations have been used in the text: PEG, poly(ethylene glycol); -NHPEG, “amino-PEG”; -NHPEG-M, “amino-PEG” -monomethyl ether; t-Boc, tert-butyloxycarbonyl; Z, benzyloxycarbonyl; Ala, alanine; Met, methionine; Gly, glycine; Glu, glutamic acid; Pro, proline; OBzl, benzyloxy; OEt, ethoxy; CD, circular dichroism; MeOH, methanol; TFE, 2,2,2-trifluoroethanol; HFIP, 1,1,1,3,3,3-hexafluoro-2-propanol.-bound linear host oligopeptides of the general formula \documentclass{article}\pagestyle{empty}\begin{document}$ t{\rm - Boc\rlap{--} (L - Met\rlap{--} )}_n {\rm NHPEG} $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ t{\rm - Boc\rlap{--} (L - X\rlap{--} )}_n {\rm NHPEG - M} $\end{document} [X = Ala, Glu(OBzl)] containing a single guest L-Pro residue at different positions in the main chain have been investigated in aqueous and alcoholic solutions as a function of concentration, temperature, and added salts using CD. The corresponding N-deblocked peptides have also been examined. The incorporation of the L-Pro residue into a host petide chain blocks the extension of the α-helical conformation at the level of the segment containing the guest residue at its N-terminal end. The investigations reveal asymmetric helixnucleation properties of the L-Pro residue as predicted by theory. In β-structure-forming oligopeptides, the insertion of a L-Pro residue results in a significant destabilization of the ordered conformation. Thus, aggregation of peptide chains is less pronounced in these co-oligopeptides.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820713
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Styrene-divinylbenzene copolymers, 3.Part 2: cf H. Jacobelli, M. Bartholin, A. Guyot, Angew. Makromol. Chem. 80, 31 (1979). Revisited IR analysisThis work is part of a research project. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2075-2085 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A critical analysis of the styrene-divinylbenzene resin infra-red spectra was made using previous works and new results. A method for the determination of pendent double bonds and also crosslinking degree and composition of the resin is drawn. A few examples of application are given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820719
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    Eine neue methode zur ermittlung kinetischer und kalorischer daten einer radikalischen copolymerisation durch differentialthermoanalyse (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2095-2103 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The heats of copolymerization of styrene and methyl methacrylate were measured by means of differential thermal analysis (DTA). Extrapolating the DTA curves to time zero, monomer reactivities and the ratio of the rate constants of termination can be obtained by a new method of evaluation. Calibration is not necessary for this procedure. With calibration, however, the rates and the heats of polymerization can also be measured. The data agree well with those reported in the literature.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820721
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    A novel synthetic route to all-ortho novolac resins (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2151-2159 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A facile synthesis of ortho-linked novolacs was achieved by reaction of selected metal phenolates with paraformaldehyde. Both solvent and phenolate counter-ion play a leading role in the ortho-specific methylene-bridging of the phenolic nuclei. The combined use of highperformance liquid chromatography and 13C NMR spectroscopy proved to be successful in the characterization of these resins.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820804
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Succinic half-esters of poly(ethylene glycol)s and their benzotriazole and imidazole derivatives as oligomeric drug-binding matrices (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2183-2192 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: α-Hydroxysuccinyl-ω-hydroxysuccinyloxypoly(oxyethylene)s (succinic half-esters of poly-(ethylene glycol)s) (2) of different molecular weights were prepared, and transformed into the corresponding benzotriazole and imidazole derivatives 3 and 4. The benzotriazolyl or the imidazolyl residues in these polymers can easily be exchanged. This was proved with model compounds bearing hydroxyl or amino groups. Polymers of this type may be considered as potential oligomeric drug-binding matrices.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820807
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Temperature effect on the stereoelective polymerization of methylthiirane in homogeneous phase (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2225-2231 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chiral cadmium thiolates of cysteine with cyclohexyl or (-)menthyl ester groups were prepared and compared with similar compounds (with isopropyl or methyl ester groups) as initiators for stereospecific polymerization of methylthiirane in homogeneous phase. The resulting polymers are highly isotactic and in all cases stereoelection can be reversed with a small change in polymerization temperature. This temperature effect permitted to differentiate two stages in the polymerization corresponding to the formation of a precursor and to that of a high polymer, respectively.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820812
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Asymmetric-selective polymerization of (R,S)-α-methylbenzyl acrylate initiated with Grignard reagent/(--)-sparteine and its modified systems (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2737-2746 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Asymmetric-selective (or stereoelective) polymerization of racemic α-methylbenzyl acrylate (2a) was studied with Grignard reagent/(-)-sparteine and its modified catalyst system in toluene. All catalyst svstems polymerized preferentially the (R)-monomer over the (S)-monomer. The Grignard reagent/(-)-sparteine system showed very low activity and gave the polymer only in a few per cent yield at -78°C. The addition of secondary amines such as piperidine and diethylamine to the catalyst system improved not only the activity but also the selectivity. The optical purity of the polymer initially formed with the cyclohexylmagnesium bromide/(-)-sparteine/diethylamine system at - 78°C was 84%, and at about 80% polymer yield almost optically pure monomer was recovered. Asymmetric selectivity decreased with an increase of temperature. The dyad tacticity of the polymer was determined by 1H NMR spectroscopy. There was no clear correlation between the selectivity and tacticity. The role of the amines in the catalyst systems was investigated by 1H NMR spectroscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821020
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    Flow properties of ethylene/vinyl acetate copolymers (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2789-2800 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of linear and branched fractions of an ethylene/vinyl acetate (EVA) copolymer is characterized by viscometry and gel permeation chromatography (GPC) exclusively. Characterization results are applied to the study of the influence of branching on flow properties of concentrated solutions of EVA fractions. Newtonian viscosity-concentration-molecular weight relationships are obtained for both linear and branched samples. Graessley's theory of entanglements for linear polymers is tested with a set of fractions. Experimental flow curves come out to be independent of the linear or branched nature of the samples.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821024
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    The effect of monomer crystal structure on the solid-state polymerization of N-vinylcarbazole (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2351-2357 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The solid-state polymerization of N-vinylcarbazole initiated by γ-rays was studied by X-rays, IR and GPC techniques to understand the role of the monomer crystal structure on the polymerization mechanism. From the X-ray diffraction results it was possible to explain the chain growth mechanism and limiting conversion. The molecular weight distribution and the role of oxygen was explained from the GPC results. Liquid chromatography and IR results were used to explain the nature of unpolymerized monomer after reaching the limiting conversion. It was proved that the unpolymerized monomer retains its crystal structure and does not react to any other compounds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820823
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Oxidative polymerization of 2,6-bis(3-methyl-2-butenyl)phenolDedicated to Professor, Dr. Georg Manecke on his 65th birthday (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 2361-2369 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Oxidative polymerization of 2,6-bis(3-methyl-2-butenyl)phenol (1) was carried out by copperpyridine catalyst. 1 was oxidatively polymerized to yield poly[oxy-2,6-bis(3-methyl-2-butenyl)-1,4-phenylene] (2) in a similar manner as it has been observed for 2,6-dimethylphenol (3a). 2 is an oily material with a degree of polymerization of 6,2. 1 and 3a copolymerized with similar reactivity to form the copolymer 4 (degree of polymerization 16 to 29). The 3-methyl-2-butenyl groups in the polymer show enough chemical reactivity for an addition of bromine or graft-polymerization.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820901
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Untersuchung der grignard-wurtz-reaktion von partiell hydrobromiertem 1,4-polybutadien und partiell α-bromiertem polyoctenylen durch metathese-abbau der polymere und identifizierung der niedermolekularen produkteHerrn Prof. Dr. Dr. h. c. F. Patat zum 75. Geburtstag gewidmet (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3041-3052 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Partially hydrobrominated 1,4-polybutadiene and α-brominated polyoctenylene were treated with pentyl, isopropyl, cyclohexyl, benzyl, 4-methylbenzyl, phenyl, 4-methylphenyl, 4-ethylphenyl, 3,4-dimethylphenyl, 2,4,6-trimethylphenyl, 4-chlorophenyl, 4-fluorophenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, and 2-thienyl magnesium bromide. In addition partially hydrobrominated 1,4-polybutadiene was treated with 2-methylbenzyl, 3-methylbenzyl and 4-isopropylphenyl magnesium bromide. Polymers were degraded by metathesis with 4-octene using WCl6/(CH3)4Sn as a catalyst. The low molecular products were separated by gas chromatography and identified by mass spectrometry. Mass spectra of products with 4-alkyl(aryl)octanediylidene units (from modified polybutadiene) and 2-alkyl(aryl)octanediylidene units (from polyoctenylene) were compared.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    13C NMR sequence analysis, 20Part 19: H. R. Kricheldorf, H. Sekiguchi, B. Coutin, J. Polym. Sci., Polym. Chem. Ed. submitted.. Stereospecificity of the polymerization of D,L-Leu-NCA and D,L-Val-NCAN-Carboxyanhydrides (Oxazolidine-2,5-diones). (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3077-3098 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The copolymerization of D- and L-Leu-NCA as well as that of D- and L-Val-NCA was studied under various conditions. Even nonpolar solvents, such as diethyl ether or ligroin, used for the precipitation of the poly(D,L-amino acid)s, were found to have an influence on yield and tacticity of the isolated polypeptides indicating that atactic polypeptides of low molecular weight may be soluble in these solvents. 13C NMR spectra of the isolated poly(D,L-amino acid)s were measured in trifluoroacetic acid and the carbonyl signals were used for the evaluation of the teacticity. Under all reaction conditions only a moderate degree of stereospecificity was found. D,L-Leu-NCA initiation with protic nucleophiles, such as benzylamine or diethylamine, favors the formation of isotactic blocks. In the case of D,L-Val-NCA again isotactic blocks are slightly favored if benzylamine is used as initiator, while diethylamine, like other strong bases, causes preferred formation of syndiotactic sequences. With strong aprotic bases and electrophilic cocatalysts, i.e. under conditions favoring the “activated monomer mechanism”, the highest degrees of stereospecificity were observed. However, in the case of D,L-Leu-NCA isotactic blocks are predominantly formed, while in the case of D,L-Val-NCA syndiotactic blocks are favoured. Changing the solvent may result in a reversal sense of the stereospecificity. The absence of long isotactic blocks in all samples of this work was also demonstrated by the good solubility of all samples in various organic solvents.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021821115
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...