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  (12,103)
  • Other Sources
  • Springer  (12,103)
  • 2020-2024
  • 1995-1999  (12,103)
  • 1996  (12,103)
  • Chemistry and Pharmacology  (12,103)
Collection
  • Articles  (12,103)
  • Other Sources
Source
Keywords
Publisher
Years
  • 2020-2024
  • 1995-1999  (12,103)
Year
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    A study on the adsorption of some cationic dyes onto acrylamide/itaconic acid hydrogels (1996)
    Springer
    Polymer bulletin 36 (1996), S. 745-752 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Acrylamide/itaconic acid (AAm/IA) hydrogels prepared by irradiating with γ radiation were used in experiments on the adsorption of some cationic dyes such as basic red 9 (BR 9), basic green 4 (BG 4), cresyl violet (CV), and basic blue 20 (BB 20). Adsorption of the cationic dyes onto AAm/IA hydrogels is studied by batch adsorption technique. In the experiments of the adsorption, Langmiur type adsorption in the Giles classification system was found. Monolayer coverages for AAm/IA hydrogel-dye systems were calculated by using B point method. Adsorption studies indicated that monolayer coverages of AAm/IA hydrogel by these dyes were increased with following order; BB 20〉CV〉BR9〉BG 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338639
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Polymerization of styrene by diphenylzinc-additive systems (1996)
    Springer
    Polymer bulletin 37 (1996), S. 13-19 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Styrene was polymerized using combined systems of diphenylzinc, Ph2Zn, and metallocene compounds activated by methylaluminoxane, MAO. From the various metallocenes employed bis (indenyl) zirconium dichloride, Ind2ZrCl2, [isopropyl (cyclopentadienyl) (1-fluorenyl)] zirconiumdichloride, i-Pr (Flu) (Cp) ZrCl2, and bis (cyclopentadienyl) titanium dichloride, Cp2TiCl2, produced the larger amounts of polymer. Ph2Zn-Cp2TiCl2-MAO system gave polystyrene, PSt, whose DSC analysis indicated a major endotherm peak at 256°C. A butanone insoluble fraction of the polymer was separated from the crude PSt. The proportion of insoluble polymer depends on the metallocene employed and on the conversion to polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313813
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Isotactic polymerization of propylene with zirconocene catalysts in the presence of a lewis base (1996)
    Springer
    Polymer bulletin 37 (1996), S. 29-33 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polymerization of propylene was carried out at 0°C in the presence of methyl methacrylate(MMA) or ethyl benzoate(EB) using rac-Et(Ind)2ZrMe2 or rac-Me2Si(Ind)2ZrMe2/Ph3CB(C6F5)4 as catalyst, which resulted in highly isotactic poly(propylene) with [mmmm]〉98%, Tm=160–161°C and very few 1,3- or 2,1 regioirregular units. With the use of an achiral zirconocene Cp2ZrMe2, a polymer with Tm=139°C was resulted as well. Base on these experimental fact that the zirconocene can form a C1-symmetrical complex with a Lewis base.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313815
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Highly active rare earth catalysts for the solution polymerization of ε-caprolactone (1996)
    Springer
    Polymer bulletin 37 (1996), S. 21-28 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary By using γ-butyrolactone (γ-BL) as the reaction media, highly active catalysts--light rare earth chloride-epoxidy-γ--BL-for the solution polymerization of ε-caprolactone, have been obtained for the first time. With these catalyst, PCL with molecular weight as his as 40x104(Mv) can be prepared at 60°C for 1.5 hr. The amount of epoxide in catalyst solution, catalyst aging temperature and time affect the catalyst activity significantly. The mechanism study shows that in γ-BL, the weakening of Ln-Cl bonds by the donation of coordinated γ-BL with Ln3+ and the homogenous effect promote the reaction between light rare earth chloride and epoxide. The produced rare earth alkoxide initiates CL polymerization via a ‘coordination-insertion’ mechanism with Acyl-oxygen bond cleavage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313814
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Surface modification of ethylene-vinyl alcohol (EVOH) copolymer films by the attachment of triethoxysilane functionality (1996)
    Springer
    Polymer bulletin 37 (1996), S. 51-57 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Triethoxysilane groups were covalently attached onto the surface of ethylene-vinyl alcohol (EVOH) copolymer film via a urethane linkage through reaction between the hydroxyl groups in EVOH and 3-isocyanatopropyltriethoxysilane in the presence of dibutyltin dilaurate as catalyst. This reaction was confirmed by ATR-IR and XPS analysis. XPS results also indicated that this reaction was not surface sensitive and the modified layer was at least 40 Å in depth. The modified film samples were further reacted with tetramethoxysilane (TMOS) for partial hydrolysis and condensation and XPS results showed a significant increase in the contents of oxygen and silicone on the surface which confirmed the above reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313818
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    An analysis of the 1H- and 13C-NMR spectra of poly(6-vinyl-1,4-benzodioxane) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 59-65 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The title monomer was synthesized from the corresponding aldehyde via a Wittig reaction. The monomer was polymerized using free radical initiation and its high field 1H- and 13C-NMR spectra were recorded. When analyzed in terms of stereochemistry the spectra showed poly(6-vinyl-1,4-benzodioxane) is an atactic polymer when synthesized via free radical initiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313819
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Dual sorption of metal-ions on a crosslinked resin of 2-acrylamidoglycolic acid and 4-vinylpyridine (1996)
    Springer
    Polymer bulletin 37 (1996), S. 191-198 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A resin containing 4-vinylpyridine and 2-acrylamidoglycolic acid was synthesized by radical polymerization with subsequent crosslinking by N,N′-methylene-bis-acrylamide. The resin was characterized by elemental analyses and FT-IR spectroscopy. The ability of this resin as well as both crosslinked homopolymers to bind Cu(II), Fe(II), Fe(III) and U(VI) was studied at different pHs depending on the metal ion. From pH=2 U(VI) was sorbed above 96% from an aqueous solution of 1.0 g/L. A dual sorption mechanism to U(VI) depending on the pH is suggested. The elution of the metal ions from the loaded resins was assayed with H2SO4 and Na2CO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Effect of the sulfide group on photopolymerization kinetics of di(meth)acrylates (1996)
    Springer
    Polymer bulletin 37 (1996), S. 199-206 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The photopolymerization of four analogous monomers: 2,2′-thiobisethanol diacrylate and its dimethacrylate plus 2,2′-oxybisethanol diacrylate and its dimethacrylate has been studied by isothermal differential scanning calorimetry (DSC) over a range of incident light intensities. The results obtained prove that the sulfide group accelerates polymerization both in the presence and absence of oxygen and enhances the conversion. The light intensity exponents for each monomer were determined and the mechanism of termination was discussed. The intensity exponents of sulfur-containing monomers are lower than their corresponding oxygen analogues, pointing to a greater participation of the bimolecular termination during their polymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294122
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Size distribution of polymers during the photoinitiated free-radical copolymerization of methyl methacrylate and ethylene glycol dimethacrylate (1996)
    Springer
    Polymer bulletin 37 (1996), S. 207-213 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Photoinitiated methyl methacrylate-ethylene glycol dimethacrylate (MMA/EGDM) copolymerization has been investigated in toluene at a monomer concentration of 35 w/v %. Diphenyl-2,4,6-trimethylbenzoylphosphine oxide (DPTPO) was used as a photoinitiator at 0.3 wt% concentration. Monomer conversions and the size distribution of the polymer molecules were measured as a function of the reaction time up to the onset of macrogelation. Compared to the photoinitiators benzoin or benzoin derivatives, gelation process proceeds at much higher rates in the presence of DPTPO. The size distribution curves obtained by size-exclusion chromatography (SEC) change from monomodal to bimodal distributions as the polymerization proceeds. Strongly bimodal SEC curves were obtained in the close vicinity of the gel point. This finding confirms the coagulation type gelation mechanism of compact primary particles. It also indicates that the present gelation theories cannot describe the structure dependent kinetics of free-radical crosslinking copolymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294123
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    FT-Raman analysis of the effects of γ-radiation on nylon 6–12 filaments (1996)
    Springer
    Polymer bulletin 37 (1996), S. 221-228 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary FT-Raman spectroscopy of commercial amorphous and crystalline nylon 6–12 filaments subjected to various γ-radiation doses are presented. The results show that a difference exists in the interaction of γ-radiation with these polyamides, depending on the crystallinity which can be evaluated by measuring the CH-stretching/CH-bending Raman band intensity ratio as a function of applied γ-dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294125
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Solid-state NMR study of natural rubber blended with EVA and EVA modified with mercaptoacetic acid (1996)
    Springer
    Polymer bulletin 37 (1996), S. 215-220 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Solid-state 13C NMR spectroscopy involving magic angle spinning (MAS) techniques with and without cross-polarization was employed for interaction studies in natural rubber (NR)/EVA and NR/mercapto-modified EVA (EVASH) blends. From arrayed of variable contact time spectra, the proton T1ϱ values were determined at short contact times to analyze the EVA or EVASH domains and longer contact times to investigate the interactions in the NR domains. Substantial changes have been observed when dicumyl peroxide was employed as curing agent in NR/EVASH and NR/EVA/EVASH blends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294124
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Thermogravimetric analysis of starch-based biodegradable blends (1996)
    Springer
    Polymer bulletin 37 (1996), S. 229-235 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Thermogravimetric analysis (TGA) has been shown to be a useful technique to determine the content of starch and other components that are usually present in blends of starch with synthetic polymers. However, some of these blends are composed of elements with an important superposition in their temperature degradation range. In these cases interpretation of the TGA results becomes quite difficult and usually important errors are committed in the determination of blend composition. We present here a method to improve the accuracy of the interpretation of TGA data. The analysis was developed to study blends containing starch, an ethylene-vinyl alcohol copolymer, and water plus glycerin as plasticizers. Using this procedure it is possible to predict blend composition with an error less than 3%, even when there is an appreciable superposition between the temperature degradation range of starch and poly(ethylene-co-vinyl alcohol). As the proposed method of analysis is quite general it may be extended to be used with other types of blends that give thermograms with similar characteristics to those described in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294126
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Synthesis of polysulfone block copolymers containing polydimethylsiloxane (1996)
    Springer
    Polymer bulletin 37 (1996), S. 329-336 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The synthesis of polysulfone-polydimethylsiloxane (PSU-PDMS)linear block copolymers has been carried out in solution by condensation of chloro-terminated bisphenol A, diphenylsulfone and α, ω-di (hydrogensilyl)-polydimethylsiloxane with Si−C bond. 1H-NMR spectra of the block copolymers allow the estimation of siloxane and polysulfone ratio. The molecular weight of the polysulfone and polysiloxane oligomers and the block copolymers was determined by GPC. Thermogravimetric analysis indicates a thermal stability of block copolymers up to 400°C and allows estimation of the process activation energy. Microphase separation of the block copolymers was observed by differential scanning calorimetry (DSC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318065
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Compatibilization of PP/PBT and PP/PA6 blends with a new oxazoline-functionalized polypropylene (1996)
    Springer
    Polymer bulletin 37 (1996), S. 353-359 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Aim of this work was to study the effectiveness of a novel oxazoline-functionalized polypropylene as a compatibilizer for PP/PBT and PP/PA6 blends. This polypropylene-based compatibilizer mixes well with the polypropylene and is capable of reacting with the carboxylic and amine end groups of PBT and PA6. Significant improvements in blend toughness were achieved without reduction in strength and stiffness. These effects were related to stabilized morphology of finely dispersed minor phase well attached to the matrix. The enhanced interfacial interactions between the two phases, in particular at high PBT content were evidenced by increased melt viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318068
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Miscibility of polyamide-6,6 with aromatic polyamides (1996)
    Springer
    Polymer bulletin 37 (1996), S. 361-367 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The polyamides with aromatic rings in the main chain were synthesized by the solution polymerization of 4,4′-diphenylmethane diisocyanate and aliphatic dicarboxylic acid in the presence of catalyst. The thermal properties and the miscibility behaviours with polyamide-6,6 of these aromatic polyamides were studied. The aromatic polyamides synthesized with one kind of dicarboxylic acid had typical thermal properties of crystalline polymers, whereas those synthesized with the mixtures of dicarboxylic acids were not easily crystallized. The observed miscibility behaviours showed some differences from those predicted by binary interaction model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318069
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Miscibility and mechanical properties of aryl-aliphatic polyamides/nylon 6 molecular composites (1996)
    Springer
    Polymer bulletin 37 (1996), S. 369-376 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of aryl-aliphatic polyamides, copoly(4,4′-diaminobenzanilide-adipamide/2,6-naphthalamide)s, with feed mole ratios of adipic acid/2,6-naphthalene dicarboxylic acid of 1/9, 3/7, and 5/5 were synthesized. A new family of molecular composites based on the synthesized aryl-aliphatic polyamides and nylon 6 has been discovered. The molecular composites were found to have at least partial miscibility between aryl-aliphatic polyamides and nylon 6. Well-defined aryl-aliphatic polyamide microfibrils a few nanometers in diameter were observed in the molecular composites. 10 wt% aryl-aliphatic polyamide clearly promoted the toughness of nylon 6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318070
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Preparation of ultrafine metal particles/polyurethane composites (1996)
    Springer
    Polymer bulletin 37 (1996), S. 377-383 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A new type of coordination polyurethane was prepared by incorporating the transition metal ions into the pyridine containing thermoplastic polyurethane films. Then the metal ions dispersed in the polyurethane matrix were reduced by controlling the exposure of the metal sites to NaBH4 under mild condition. The reduction of the polyurethane metal complex films resulted in the production of amorphous ultrafine metal powders. The size of these powders was controlled by the content of the metal ions and the polarity of the polymer matrix. A polar polymer backbone and lower metal ion concentration favored to achieve a smaller particle. It was also found that the polymer chains prohibited the excessive aggregation of the metal atoms and have protective effect on the final metal powders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318071
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Toughening mechanisms in modified epoxy resins with different crosslink densities (1996)
    Springer
    Polymer bulletin 37 (1996), S. 399-406 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Crack-tip deformation has been investigated in pre-cracked samples of core-shell rubber particle modified epoxy resins with different degrees of crosslinking. Light cross linking resulted in cavitation of the modifier, the formation of croids and extensive crack-tip yielding, whereas these deformation mechanisms were suppressed at room T in highly crosslinked specimens. A zone of particle debonding was observed in these latter at high T, but this appeared detrimental to the toughness. Indeed it was possible to increase the toughness in this case by oxygen plasma treatment of the modifier particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318074
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Synthesis and properties of 2,2,6,6-tetramethyl-1-(1-phenethyloxy)piperidine, an initiator for living free radical styrene polymerization (1996)
    Springer
    Polymer bulletin 37 (1996), S. 451-456 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary An initiator for living free radical polymerization may be prepared by trapping the benzylic ethylbenzene radical with the stable 2,2,6,6-tetramethylpiperidinyl-1-oxy (TEMPO) radical. The adduct, 2,2,6,6-tetramethyl-1-(1-phenethyloxy)piperidine (TMPEP), smoothly undergoes thermal fragmentation at temperatures approaching 140° C to afford an active carbon radical capable of initiating polymerization and a passive mediating nitroxyl radical to reversibly cap and preserve the propagating polymer chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556804
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Kinetics of association processes of d-fructose dehydrogenase onto liposome surfaces (1996)
    Springer
    Polymer bulletin 37 (1996), S. 407-414 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Association processes of D-fructose dehydrogenase (FDH) onto surfaces of liposomes which were composed of N-(5-dimethylamino-1-naphthalenesulfonyl)-L-α-dimyristoylphosphatidylethanolamide and L-α-dimyristoylphosphatidylcholine or L-α-dimyristoylphosphatidylglycerol (1:9) were investigated by the fluorescence stopped-flow technique. The association processes were divided into two relaxation processes: the faster process whose apparent rate constant monotonously increased with the concentration of FDH, and the slower process whose rate constant showed a saturation behavior. Taking the number of binding sites on the liposome surface into consideration, the corrected association rate constant of the faster process was 4.4% of the theoretical value for a binary collision, probably due to a disadvantageous surface-searching and dehydration processes on the liposome and protein surfaces. The Arrhenius plots of the rate constants both for the faster and slower steps showed a discontinuous change around the gel to liquid-crystal phase transition temperature of the liposomes. Strong influences of deformability of liposomes, and state of hydrating water molecules around polar heads, on the rate of association processes were suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318075
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    Ruthenium catalyzed copolymerization of 2-acetylphenanthrene and α,ω-dienes (1996)
    Springer
    Polymer bulletin 37 (1996), S. 423-428 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Copolymers with 2-aceto-1,3-phenanthrenylene units in the chain have been directly prepared by Ru catalyzed step-growth copolymerization of 2-acetyl phenanthrene and α,ω-dienes such as 1,3-divinyltetramethyldisiloxane. Copolymers which incorporate 2-aceto-1,3-phenanthrenylene units possess higher TgS and increased thermal stability compared to analogous copolymers which have 2-aceto-5-phenyl-1,3-phenylene(biphenyl) or 2-aceto-1,3-phenylene units. Fluorescence spectra of these copolymers have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556800
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Synthesis and regeneration of reactive polymers bearing triphenylphosphine dichloride functional groups using triphosgene (1996)
    Springer
    Polymer bulletin 37 (1996), S. 415-421 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A new methodology is described for the synthesis of reactive polymers bearing triphenylphosphine dichloride groups by the use of triphosgene. These materials show high reactivity for the room temperature conversion of benzyl alcohol to benzyl chloride. In one hour, yields higher than 90% were achieved using reactive copolymers with up to 25 w% divinylbenzene (DVB). The functional groups can be easily and efficiently regenerated using 1.0 mol of triphosgene for every 2.6 moles of phosphine in the polymer. Preliminary results showed up to 40% conversion of benzyl alcohol in column reactions using regenerated polymers at 5 to 10 min contact times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556799
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Biosynthesis and characterization of poly(β-hydroxybutyrate) produced byBacillus circulans (1996)
    Springer
    Polymer bulletin 37 (1996), S. 429-435 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The biosynthesis of poly (β-hydroxybutyrate) (PHB) byBacillus circulans was carried out through cultivation in nutrient broth in a single step. $$\overline {\text{M}} {\text{v}}$$ of polymer fractions soluble in chloroform were close to 2 x 105. IR,1H and13C NMR spectra of the isolated PHB were in agreement with the assumed structure of this poly-β-hydroxyester. NMR spectroscopy pointed out a high percentage of isotactic polymer, while differential scanning calorimetry showed that the PHB was crystalline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556801
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Polyacrylonitrile-graft-poly(ethylene oxide) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 437-442 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Graft copolymers of polyacrylonitrile (PAN) and poly(ethylene oxide) (PEO) were synthesized by radical copolymerization of acrylonitrile and methacrylate-headed poly(ethylene oxide) macromonomer. The macromonomer was prepared by reaction of methacryloyl chloride with PEO. The effects of solution concentration, initiator concentration and acrylonitrile/macromonomer molar ratio on the conversion, molecular weight and PEO branch content in the graft copolymer were studied. The graft copolymers were characterized by GPC, FTIR,13C-NMR and Kjeldhal method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556802
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Copolymerization of 2,5-dimethyl-3-vinylthiophene with methyl methacrylate, styrene and isobutyl methacrylate (1996)
    Springer
    Polymer bulletin 37 (1996), S. 457-462 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The title vinyl thiophene monomer was synthesized by dehydration of the corresponding secondary alcohol. Free radical initiated copolymerizations with methyl methacrylate, styrene or isobutyl methacrylate were performed and the copolymer compositions were used in the calculation of reactivity ratios. The data was analyzed via a nonlinear least squares error-in-variables method. The 2,5-dimethyl-3-vinylthiophene was shown to have equal or slightly less reactivity than each of the monomers chosen as comonomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556805
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Synthesis and radical polymerization of novel vinyl monomers having the imidazoline and pyrimidine moiety (1996)
    Springer
    Polymer bulletin 37 (1996), S. 443-450 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Alkylation of the methylene bridged tetrahydropyrimidine derivatives by chloromethylstyrene produces the bridged bis(4-vinylbenzyl)-1,4,5,6,-tetrahydropyrimidinium salts in high yields. Similar procedures are used to prepare 2-imidazolinium derivatives. The quaternary salts which support functional side groups of potential biomedical interest are characterized by means of spectroscopic methods. These monomers are readily polymerized free radically in solution of dimethyl formamide at moderate temperatures. The soluble and insoluble polymers containing 2-imidazolinium and 1,4,5,6-tetrahydropyrimidinium salts were found to exhibit antibacterial activites againstEscherichia coli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556803
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Synthesis, characterization of poly(allylamine)chelates with Cu(II), Co(II) and Ni(II) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 463-468 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The parent polymer, poly(allylamine) as ligand polymer was employed to synthesize polychelates of heavy metal ions. The functional poly(allylamine) and its Ni(II), Co(II) and Cu(II) metal chelates were characterized by elemental analysis, FT-IR spectroscopy, TGA, and SEM. For the polychelates magnetic and conductivimetry studies were also carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556806
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Novel chemically amplified imaging materials containing malonate pendant groups (1996)
    Springer
    Polymer bulletin 37 (1996), S. 475-482 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A new chemically amplified polymeric imaging system based on polymers containingt-butylmalonate pendant groups has been demonstrated. Both the homopolymer of di-t-butyl (vinylbenzyl)benzylmalonate and its copolymer with styrene have been tested in coatings containing a photoacid generator. Imaging experiments confirm that the materials have very high sensitivities when exposed to UV radiation near 250nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556808
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Preparation of new gels derived from poly(sucrose acrylate) with immobilized Cibacron Blue and their application in affinity chromatography (1996)
    Springer
    Polymer bulletin 37 (1996), S. 483-488 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New pseudoaffinity chromatography supports were prepared and characterized from poly(sucrose acrylate) crosslinked with MDI or TDI and Cibacron Blue dye as ligand. Blue gels were useful in the retention of albumin and the results are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556809
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    The effect of the ethylene pressure on its reaction with 1-hexene, 1-octene and 4-methyl-1-pentene (1996)
    Springer
    Polymer bulletin 37 (1996), S. 469-474 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Copolymers of ethylene and 1-hexexe, 1-octene and 4-methyl-1-pentene were obtained using Et[In]2ZrCl2/MAO catalyst at various pressures. The increase of 1-hexene and 1-octene concentration in the feed increases catalyst activity(g/nZr.h.bar) and productivity(g/nZr.h). For 4-methyl-1-pentene the activity is independent on comonomer concentration. Increasing the ethylene pressure the productivity of the copolymerization increases and the activity shows a weak decay. Characterization of the copolymer shows that at higher pressure the cristallinity of the copolymers is higher due to lower comonomer incorporation. There is a good linear correlation of cristallinity with comonomer concentration in the feed for 1-hexene and 1-octene at a fixed pressure, but not for 4-methyl-1-pentene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556807
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Block copolymerization of tetrahydrofuran with δ-valerolactone by the samarium iodide-induced transformation (1996)
    Springer
    Polymer bulletin 37 (1996), S. 597-601 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polymerization behavior of δ-valerolactone (VL) with alkylsamarium (RSmI2) was studied, and its application to the block copolymerization of tetrahydrofuran (THF) with VL was examined. Polymerization of VL by butylsamarium gave the corresponding poly(VL) in good yield. The yield increased with increasing the concentration of VL and decreasing the polymerization temperature, resulting from the equilibrium between VL and poly(VL). The decrease in the molecular weight of poly(VL) by prolonging the polymerization time indicated the existence of back-biting reaction to form cyclic oligomers. The polymerization of VL with poly(THF)-macroanion obtained by the two-electron reduction of the propagation center of living poly(THF) with SmI2 led to the block copolymer of THF with VL. The initiation efficiency of VL-polymerization was almost quantitative, and the unit ratio of THF and VL-segments could be controlled by both the polymerization time of THF and the amounts of VL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296604
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Syndiotactic polymerization of styrene with CpTiCl2(OPri)/methylaluminoxane (1996)
    Springer
    Polymer bulletin 37 (1996), S. 719-721 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary CpTiCl2(OPri) was a very active catalyst for syndiotactic polymerization of styrene when activated with methyl aluminoxane (MAO). The catalyst activity and syndiospecificity of CpTiCl2(OPri)/MAO were about 107 g PS / mol Ti·mol S·h and about 95% respectively, both higher than those of CpTiCl3 / MAO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295768
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Cationic polymerization of styrene and indene in iodine/liquid sulfur dioxide system (1996)
    Springer
    Polymer bulletin 37 (1996), S. 729-735 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The cationic polymerizations of indene (Ind) and styrene (Sty) initiated by iodine (I2) in liquid sulfur dioxide (SO2) were investigated. Reactions involving Ind were characterized by termination by neutralization between the growing carbocationic species and the nucleophilic counteranion, at low temperature. Sty polymerization is also termination-dominated and gives low conversion at -20°C. High resolution gas chromatography coupled with mass spectrometry (HGC-MS) analysis of non polymeric material in the Sty polymerization suggested that initiation of Sty polymerization involves the formation of 1,2 diiodide adduct prior to initiation with HI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295770
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of the novel cellulose derivative dansyl cellulose (1996)
    Springer
    Polymer bulletin 37 (1996), S. 743-749 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Novel, soluble 5-dimethylamino-1-naphthalenesulfonyl esters of cellulose (2) with a degree of substitution from 0.67 to 1.59 were prepared by esterification of cellulose dissolved in N,N-dimethylacetamide/LiCl solvent system and characterized by means of FTIR-as well as 1H and 13C NMR-spectroscopy. The remaining OH groups of 2 can be fully acetylated in pyridine using N,N-dimethylaminopyridine as a catalyst. The polymers show typical fluorescence and absorption spectra with absorptions at 217, 250 and 317 nm which are in good agreement with quantum chemical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295772
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    Poly(styrene)s with oligo(ethylene oxide) side chains as catalysts for phase transfer reactions (1996)
    Springer
    Polymer bulletin 37 (1996), S. 759-763 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A very interesting part within the wide field of chemical reactions are-catalyzed reactions. To find an effective low cost catalyst for various applications is a primary goal of many workers. Polymer chemistry is able to provide systems with qualities not known for monomeric catalysts. Especially in heterogenic systems the use of polymeric catalysts has many advantages such as easy separation for reuse or low toxicity. A special type of heterogenic catalysis is the phase transfer catalysis. Comb polymers of poly(styrene) with oligo(ethylene oxide) side chains were investigated for their ability as phase transfer catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295774
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Zn lactate as initiator of dl-lactide ring opening polymerization and comparison with Sn octoate (1996)
    Springer
    Polymer bulletin 37 (1996), S. 771-776 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Zn lactate, 3H2O and dehydrated Zn lactate were used as initiator to polymerize DL-lactide under various conditions. It is shown that the latter does polymerize DL-lactide up to high molecular weight at a slower rate than Sn octoate. Zn lactate being formed when lactic acid is allowed to react with Zn metal, it is believed that the active species in Zn metal initiation is Zn lactate. Comparison was made of the two poly(DL-lactide) initiated with Zn metal and Sn octoate respectively and selected to have almost similar characteristics. It is shown that degradation characteristics of the two polymers are different, especially water uptake and rate of heterogeneous degradation. It is further shown that residual Sn concentrated within the matrix remnants whereas the content in Zn remained constant according to degradation controlled release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295776
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Polytetrahydrofuran macroinimer (1996)
    Springer
    Polymer bulletin 36 (1996), S. 27-34 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polytetrahydrofuran macroinimers were synthesized by means of cationic polymerization of tetrahydrofuran, initiated by azo-oxocarbenium salt, followed by termination with methacrylate anion. The macroinimers were characterized by 1H-NMR analysis and GPC measurements. Self polymerization of macroinimers and copolymerization with methyl methacrylate (MMA) yielded crosslinked and soluble branched block copolymers depending on the MMA concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296004
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Indication of an order-order-transition by a partial disordering in ABC-triblock copolymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 43-50 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Poly(ethylene-alt-propylene)-block-polyethylethylene-block-polystyrene (PEP-b-PEE-b-PS) triblock copolymers were synthesized by anionic polymerization and subsequent hydrogenation of poly-1,4-isoprene-block-poly-1,2-butadiene-block-polystyrene triblock copolymers (1,4PI-b-1,2PB-b-PS). Differential scanning calorimetry and dynamic mechanical spectroscopy reveal an order-order transition which is induced by the mixing of PEP and PEE above their respective order-disorder transition (ODT).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296006
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polymer light conduits (1996)
    Springer
    Polymer bulletin 36 (1996), S. 51-58 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Large diameter polymer light conduits are prepared for the first time by UV-curing. The polymer cores of the polymer light conduits are prepared from the copolymerization of various monomer mixtures in FEP tubes by UV curing, where FEP is used as the polymer cladding. The monomer mixtures consist of a multifunctional monomer for adjusting the heat resistance of the polymer cores and a monofunctional monomer for adjusting the flexibility. Experimental results indicate that the properties of the prepared polymer light conduits can be significantly modified by the formulations of the reactant mixtures. The onset thermal decomposition temperatures of the prepared polymer cores are 50°C to 79°C higher than that of the PMMA core. The glass transition temperatures and the refractive indices of the prepared polymer cores decrease from 78°C to -34°C and 1.490 to 1.474, respectively, when the contents of 2-ethyl-hexyl acrylate in the monomer mixtures increase from 0% to 70%. The prepared polymer light conduits conduits have large numerical apertures suitable for wide angle illumination applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296007
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Radical polymerization and antibacterial activity of copolymers based on N-1-adamantylmaleimide (1996)
    Springer
    Polymer bulletin 36 (1996), S. 59-65 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New copolymers were prepared by radical polymerization starting from N-1-adamantylmaleimide (AMI) and styrene (ST). The copolymerization of AMI with ST proceeded easily to give medium molecular weight of copolymers $$\left( {\overline M _n 〉 {\text{10}}^{\text{4}} } \right)$$ in high yield. The poly(AMI-co-ST)s had high Tg (205–236 °C) and good thermal stability. Moreover, the poly(AMI-co-ST)s exhibited activity against the staphlococcus aureus ATCC 25923. The monomer reactivity ratios(r1,r2) in the copolymerizations of AMI with ST, and Alfrey-Price Q, e values for AMI were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296008
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    The dispersion of polymethylsilsesquinoxane into polyimide (1996)
    Springer
    Polymer bulletin 36 (1996), S. 67-72 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Through the pretreatment of 4, 4′-oxydianiline(ODA) with polyhydrogenmethylsiloxane (PHMS) using sodium hydroxide as a catalyst and subsequent reaction of this pretreated PHMS-ODA with 3, 3′, 4, 4′-benzophenonetetracarboxylic dianhydride(BTDA), polysiloxane can be attached to the polyamic acid by the silyl ester bond. By the thermal treatment of this polysioloxane—polyamic acid compound, well dispersed polymethylsilsesquinoxane(PMSQ) into polyimide can be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    Spontaneous gelation of poly(oligo-oxyethylene methacrylate) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 73-78 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The spontaneous gelation of poly(oligo-oxyethylene methacrylate) was studied. When the solvent of the polymer solution was removed by freeze drying or evaporation under atmosphere, spontaneous gelation occurred. This gelation is caused by the radical generation and chain transfer reaction, which is evidenced by the prevention of gelation during freeze drying and evaporation under atmosphere with adding radical inhibitor into the polymer solution. The soluble residue of the crosslinked gel formed during freeze drying was found to be poly(ethylene glycol) which is the side chain of the polymer. This fact indicates that the cleavage of the side chain accompanies the gelation. The possible mechanism of the gelation is proposed with the idea that induced stress by solvent removal would cause the cleavage of the side chain and the generated radical is transferred to the other chain resulting in gelation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296010
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Rheo-optical Fourier transform infrared spectroscopy of a liquid-crystalline block copolymer (1996)
    Springer
    Polymer bulletin 36 (1996), S. 87-94 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In the present rheo-optical experiments FTIR polarization spectroscopy was used to investigate the orientational behaviour of the different constituents of an LC block copolymer (copolyester imide) during uniaxial elongation at different temperatures. The results exhibit differences in the degree of alignment as well as in the response to the application of the mechanical load. With increasing temperature the level of the applied stress and the induced orientation decrease, while the differences in the orientational behaviour of the mesogen and the flexible spacer are retained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296012
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Spherulite formation in a “noncrystalline” two-dimensional hydrogen-bond assembly (1996)
    Springer
    Polymer bulletin 36 (1996), S. 95-102 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 4-Urazoyl benzoic acid groups 1 are attached as terminal end group to an oligoisobutene. According to wide-angle X-ray scattering the material is amorphous. Differential scanning calorimetry, small-angle X-ray scattering, transmission electron microscopy, and polarizing microscopy show that the polar head groups form ordered two-dimensional assemblies which organize into spherulites. Temperature-dependent SAXS measurements and the d.s.c. analysis give a close insight into the order-disorder (“melting”) process of the two-dimensional clusters which form macroscopic spherulites. The order-disorder transition of the clusters is closely related to the dynamics and order of the polyisobutene chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296013
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Studies on mechanism of phase transformation of carboxylated poly(phenylene oxide) and polystyrene blend by Fourier transform infrared spectrometry (1996)
    Springer
    Polymer bulletin 36 (1996), S. 79-86 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The thermally-induced phase transformation behaviors of carboxylated poly(phenylene oxide)(CPPO)/polystyrene(PS), and PPO/PS blends were studied by using a difference-spectrum method of Fourier Transform Infrared Spectrometry (FTIR). The difference intensities(μ) and vibration frequency shifts(Δν) of the characteristic infrared absorption bands in both CPPO/PS and PPO/PS increased with raising temperature. A linear temperature dependence in the band frequency vs. temperature plots was observed for PPO/PS system, while three slopes corresponding to the three temperature ranges: below 190°C, 190°–215°C, and above 220°C, appeared in frequency-temperature curves for the CPPO/PS blend. These temperature ranges are consistent with the UCST area, the miscible area and the LCST area obtained by our previous works. The mechanism of phase transformation of CPPO/PS was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296011
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    A model for the tensile curve with yield of a polymer fibre (1996)
    Springer
    Polymer bulletin 36 (1996), S. 125-131 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A model is presented for the tensile curve of fibres made of linear extended polymers measured below the glass transition temperature. In this series model the parameters are the chain orientation distribution, the average modulus for shear between the chains, the chain modulus and a simple yield condition based on the critical resolved shear stress. A good agreement between the experimental tensile curves of poly(p-phenylene terephthalamide) and poly(ethylene terephthalate) fibres and the theoretical curves has been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296017
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Effect of intermolecular cross links on drag reduction by polymer solutions (1996)
    Springer
    Polymer bulletin 36 (1996), S. 111-118 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this work we explore the effect of a cross-linking agent on the drag reduction capability of hydroxypropyl guar and guar gum solutions in turbulent flow through horizontal pipes. The results show that the addition of a cross-linking agent (borax) to solutions with concentrations below those required for gel formation enhances drag reduction due to the increased dimensions of the macromolecules in the presence of intermolecular cross links. The flow-induced degradation of the polymers is not appreciably affected by the addition of cross-linking agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296015
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Change of phase behaviour of diblock copolymers upon application of pressure (1996)
    Springer
    Polymer bulletin 36 (1996), S. 103-110 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Poly(styrene-b-paramethylstyrene) block copolymer samples have been prepared in a mechanical press, cooled under pressure below the glass transition temperature and investigated by small angle neutron scattering. We observe a microphase separation transition from an orderd to a disorderd state with ascending pressure. The observed effect is not expected solely due to pressure, but the situation in the press is more complicated: (i) Ascending pressure leads to an increase of the glass transition temperature which slows down relaxations and hinders the evolution of thermodynamic equilibrium, (ii) the uniaxial movement of the piston leads to an uniaxial shear field and samples get oriented. An adiabatic heating during the pressing procedure has been found to be of minor influence. The situation is discussed with respect to common sample preparation conditions and processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296014
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Towards phase transformation toughened semicrystalline polymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 119-124 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Phase transformation toughening (PTT), characterized by a transition from a metastable to a stable crystalline phase and associated with volume expansion, is widely used for toughness improvement of metals and ceramics. The essential prerequisites of this toughening concept are met also for semicrystalline polymers since they are polymorphous and capable to undergo transformation from one crystalline phase to an other under mechanical stresses. The transition is, however, mostly connected to volume contraction, i.e. just the opposite what is being exploited in toughened steels and ceramics. It was argued that an irreversible transformation from a less dense crystalline phase to a more dense one could also be beneficial for toughness upgrading in polymers. This transition is combined with changes in lamellar and molecular level resulting in a “strain-hardened” microstructure, that can be considered as the best possible response of the polymer upon mechanical loading (“adaptive” toughening). The main advantage of the PTT concept is that toughness improvement is achieved without incorporation of foreign materials which is the guarantee of easy recycling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296016
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Content to volume 273 (1996)
    Springer
    Polymer bulletin 36 (1996), S. A5 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296018
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of copolymers obtained from 1,3,5-trioxane and octamethylcyclotetrasiloxane by triflic acid initiator (1996)
    Springer
    Polymer bulletin 36 (1996), S. 173-180 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of poly(oxymethylene-co-dimethylsiloxane) copolymers were synthesized in the molten state by cationic ring opening copolymerization of trioxane and octamethylcyclotetrasiloxane by using trifluoromethanesulfonic acid (triflic acid; CF3SO3H) as initiator. When the concentration of the oxymethylene comonomer units (-OCH2-) in the copolymers are very high, crystalline copolymers are obtained. If the concentration of the dimethylsiloxane co-units (-OSi(CH3)z-) increases, rubberlike materials are obtained. Reaction mechanisms are proposed to explain the growth of the copolymer chains. FTIR and NMR studies suggest the existence of block copolymers and block copolymers with random segments. Thermomechanical characterization of the copolymers was also carried out. This new synthetic method allows us to obtain linear copolymers containing both oxymethylene and dimethylsiloxane comonomer units in the main chain. The copolymerization of these cyclic monomers was demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294903
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Preparation of epoxy acrylate emulsion using mixed surfactants and its polymerization (1996)
    Springer
    Polymer bulletin 36 (1996), S. 141-148 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of epoxy acrylate emulsions were prepared with several surfactants ranging from HLB 12 to 14 at 40°C. For epoxy acrylate emulsion, additives and conditions were established among factors: HLB value of emulsion, agitation speed, water dropping speed, and dropping amount of the deionized water. For emulsion polymereization with water soluble initiator KPS, emulsion was broken during polymerization, because interfacial complex formed by association of surfactant with co-surfactants stabilizing emulsion was weakened by interpenetration of radicals formed at aqueous. Accordingly, the polymerization of epoxy acrylate emulsion was carried out by using oil soluble initiator, AIBN, and the conversion changes with initiator concentration and HLB values were investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294899
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    Syntheses and characterizations of copolymers of dicyanoquinone methides with α-acetoxystyrenes (1996)
    Springer
    Polymer bulletin 36 (1996), S. 149-156 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 7,7-Dicyanoquinone methides (1a-b) copolymerized spontaneously with substituted α-acetoxystyrenes (2a-b) in benzene at 60 °C to give alternating copolymers (poly(1a-b-co-2a-b)) with the molecular weights of 8–60×104 in 42–66% yields. When these copolymers were heated under nitrogen, they eliminated acetic acid quantitatively at around 200 °C to be converted to the copolymers (poly(3a-d)) with olefinic bonds, which were characterized by infrared and nuclear magnetic resonance spectroscopy. Alternating copolymers and the corresponding copolymers with olefinic bonds were amorphous, and capable of being cast from their chloroform solutions into transparent, tough films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294900
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Examples of new synthetic routes to pendant ester-ether derivatives of α-hydroxymethylacrylate polymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 133-140 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Three routes to new ester-ether derivatives of ethyl α-hydroxymethylacrylate (EHMA) and t-butyl α-hydroxymethylacrylate (TBHMA) were investigated. The first approach involved the preparation of chloroacetate derivatives of EHMA and TBHMA as intermediates followed by attempted etherification of the chloroacetate group. All attempted nucleophilic reactions of ethyl α-chloroacetoxymethacrylate (ECAM) and t-butyl α-chloroacetoxymethacrylate (TBCAM) gave Michael-type substitution products with loss of the α-chloroacetyl substituent. Polymer substitution was therefore investigated. Bulk polymerization of ECAM with AIBN gave unexpectedly high molecular weight polymer with a number average value of 1.15 million. This homopolymer was substituted with 4-phenylphenol in excellent conversion. The second approach involved the reaction of ethyl α-chloromethylacrylate (ECMA) with α-ethers of acetic acid sodium salts using phase transfer catalysis. The methoxyacetate derivative was prepared and polymerized to give a polymer with a number average molecular weight of 260,000. The third route to ester-ether derivatives involved three steps: reaction of t-butylchloroacetate with an alcohol to give the ether, conversion of the t-butyl group to the acid chloride, and reaction of the acid chloride with EHMA or TBHMA. The 2-(4-phenylphenoxy)acetate derivative of EHMA was prepared using this method, and converted to high polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294898
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly(2-methylaziridine) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 157-164 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The cationic polymerization of 2-methylaziridine using boron trifluoride etherate as initiator at different monomer/initiator ratios, temperatures, solvents, and times of polymerization was carried out. The effect of these variables on the polymerization yield and viscosity of the polymers was studied. All the polymers were characterized by elemental analysis, FT-IR, 1H-NMR, 13C-NMR spectroscopy, thermogravimetric analyses and differential scanning calorimetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294901
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Analysis of the 13C-NMR and 1H-NMR spectra of poly(2,5-dimethyl-3-vinyl thiophene) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 181-188 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The title monomer was synthesized and polymerized using free radical initiation. The polymerization was facile and proceeded rapidly to high conversion. The high field 13C-NMR and 1H-NMR spectra of the polymer had several signals that displayed sensitivity to polymer stereochemistry. Analysis of these signals showed poly(2,5-dimethyl-3-vinyl thiophene) to be an atactic polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294904
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Swelling behavior of temperature- and pH-sensitive block terpolymers for drug delivery (1996)
    Springer
    Polymer bulletin 36 (1996), S. 221-225 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Hydrogels prepared by block terpolymerization of N-isopropylacrylamide (NIPAAm), acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) exhibit significant temperature sensitivity due to the block structure of the NIPAAm moiety, even at concentrations as low as 10 mol%. pH-Sensitivity was also observed due to the ionizable AA component. The swelling ratio dependence on temperature is significantly more prominent for block terpolymers than for the corresponding random terpolymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294910
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Short aramid-fiber reinforced ultra-high molecular weight polyethylene (1996)
    Springer
    Polymer bulletin 36 (1996), S. 213-220 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Ultra-High Molecular Weight Polyethylene (UHMWPE) is frequently used in artificial joints because of its high wear resistance. To extend the lifetime of these joints even further, it is necessary to decrease the wear rate. The wear rate may be decreased by blending UHMWPE with short aramid fibers. On account of the extremely high viscosity of UHMWPE mixing was accomplished by swirling the UHMWPE powder and the chopped fibers with compressed dry nitrogen, and a composite with fairly uniformly distributed and randomly oriented fibers was obtained by compression moulding. The failure behaviour of the composite changes from ductile for low fiber content to brittle failure for higher fiber content. The deviation of the experimental Young's modulus from the theoretical value can be explained by, among others, the void content. Preliminary results show that the wear rate of UHMWPE indeed decreases with incorporation of the aramid fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    A highly ordered polymeric Langmuir-Blodgett film (1996)
    Springer
    Polymer bulletin 36 (1996), S. 227-232 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A new type of polymeric LB film named “Reversed Duckweed” type LB film was fabricated by use of a new kind of amphiphilic polymer which was composed of a flexible hydrophilic epichlorohydrinethylene diamine crosslinking microgels and several hydrophobic stearic chains. It had highly ordered structure, including a well ordered layer structure and highly oriented hydrophobic alkyl chains in each layer, which was confirmed by low angle X-ray diffraction and polarized FTIR-ATR experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294911
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Synthesis of polymers bearing azo-dye chromophore with photocrosslinkable moiety for nonlinear optics (1996)
    Springer
    Polymer bulletin 36 (1996), S. 407-414 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Novel photocrosslinkable second-order nonlinear optical(NLO) polymers were synthesized from radical homopolymerization of 4-[N-ethyl-N-(2-methacryloyloxyethyl)]amino-4′-(2-cinnamoyloxyethyloxycarbonyl)-2′-nitroazobenzene(MACN) or copolymerization of MACN with 2-(cinnamoxyloxy)ethyl methacrylate(CM), and from polycondensation of 4-[N,N-bis(2-hydroxyethyl)]amino-4′-(2-cinnamoyloxyethyloxycarbonyl)-2′-nitroazobenzene(HACN) with p-phenylenediacyloyl chloride(PD). For the purpose of obtaining an optimized condition of UV irradiation for poling treatment involving photocrosslinking, photoreactivity of these NLO polymer films was investigated. There was observed considerably different photoreaction behavior, especially in photofading of the NLO chromophore, between MACN polymer and HACNPD polycondensate; the latter faded more rapidly than the former. A reason for this phenomenon was considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315056
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Spontaneous copolymerization of N-(2-hydroxyethyl)ethyleneimine with maleic anhydride (1996)
    Springer
    Polymer bulletin 36 (1996), S. 415-422 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The copolymerization of N-(2-hydroxyethyl)ethyleneimine, (HEEI) as nucleophilic monomer and maleic anhydride (MA) as electrophilic monomer in the absence of initiator in acetonitrile was investigated. Copolymers were characterized by IR, 1H-NMR and 13C-NMR spectroscopy. The copolymer composition depends on the monomer ratio in the feed, determined by 1H-NMR spectroscopy. The presence of MA bridges between copolymer chains was established by spectroscopic analysis. At lower temperature the yield and molecular weight of copolymers decrease as well as the MA unit content in the copolymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315057
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Comparison of some 4- and 4,4′-substituted derivatives of stilbene for their reactivities towards the benzoyloxy radical (1996)
    Springer
    Polymer bulletin 36 (1996), S. 423-426 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 4-Fluoro- and 4,4′-difluorostilbene are similar in their reactivities towards the benzoyloxy radical; a similar conclusion has been reached in respect of 4-chloro- with 4,4′-dichlorostilbene and 4-phenyl-with 4,4′-diphenylstilbene. These results have been obtained by consideration of the numbers of benzoate and phenyl end-groups in poly (methyl methacrylate) made using benzoyl peroxide in the presence of the appropriate derivative of stilbene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315058
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Synthesis and free radical polymerization of p-(2-methacryloyloxyethoxy)-N-(4-nitrostilbenzylidene)aniline for nonlinear optical applications (1996)
    Springer
    Polymer bulletin 36 (1996), S. 533-540 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary p-(2-Methacryloyloxyethoxy)-N-(4-stilbenzylidene)aniline 6 was prepared by the reactions of methacryloyl chloride with p-(2-hydroxyethoxy)-N-(4-stilbenzylidene)aniline 5. Monomer 6 was polymerized with radical initiators to obtain polymer with p-oxy-N-4-(stilbenzylidene)aniline, which is presumably effective chromophore for second-order nonlinear optical applications in the side chain. The resulting polymethacrylate 7 showed a thermal stability up to 300 °C in TGA thermogram, and the Tg value obtained from DSC thermogram was 166°C, which is acceptable for NLO device applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342443
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Effective esterification of carboxymethyl cellulose in a new non-aqueous swelling system (1996)
    Springer
    Polymer bulletin 36 (1996), S. 549-555 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Carboxymethyl cellulose (CMC) was treated in a dipolar-aprotic solvent like N,N-dimethylacetamide, or dimethylsulfoxide (DMSO) with p-toluenesulfonic acid yielding a high reactive gel-suspension of the polymer. This mixture allows a direct esterification of free hydroxyl groups of CMC as exemplified by acylation with carbonic acid chlorides, or anhydrides, and with isocyanates as well as by sulphation, phosphating and silylation. The products characterized by elemental analysis and FTIR spectroscopy possess a high degree of functionalization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342445
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Enzyme-catalyzed syntheses of poly(1,6-hexanediyl isophthalate) and poly(1,6-hexanediyl terephthalate) in organic medium (1996)
    Springer
    Polymer bulletin 36 (1996), S. 541-548 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The enzyme-catalyzed synthesis of poly(1,6-hexanediyl terephthalate) and poly(1,6-hexanediyl isophthalate) is described. An unsuccessfull attempt to synthesize poly(1,6-hexanediyl o-phthalate) is also presented and the reactivity of those three monomers is discussed according to the enzymatic nature of the catalyst. The crude polyesters are characterized by 1H and 13C NMR spectroscopy and by differential scanning calorimetry. Macrocycles are isolated from poly(1,6-hexanediyl isophthalate) and characterized by steric exclusion chromatography and by mass spectrometry. The number-average molar masses and the thermal properties of the crude, linear and cyclic polyesters are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342444
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Effect of PVC on low-polar isobutylene polymerization in the presence of BCl3 (1996)
    Springer
    Polymer bulletin 36 (1996), S. 557-562 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The low-polar polymerization of isobutylene (IB) in the presence of BCI3 was carried out in CH2Cl2 ([IB]=7 mol/l) at -78, -20 and +20°C in the presence of vinyl chloride/2-chloropropene (VC/2CP) copolymer, representing PVC resin enriched in structures with chlorine atoms bonded to the tertiary carbons. The polymerization products consist of mixtures of polyisobutylenes (PIB) and grafted VC/2CP-g-PIB copolymer. Attention was focused on evaluation of the extent of the grafting reaction. VC/2CP-g-PIB was analyzed by GPC, 1H-NMR and 13C-NMR spectroscopies and elemental analysis. The results obtained indicate that the rate of polymerization of IB decreases with increasing temperature but that the grafting efficiency increases. The experiments demonstrated that the VC/2CP copolymer induces strong grafting, compared with PVC, and that it might therefore be assumed that the C-Cl bonds with chlorine atoms bound to tertiary carbons directly initiate the polymerization of IB. The effect of the C-Cl bonds is discussed in terms of their catalytic and initiation activities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342446
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Synthesis by metallocene/MAO catalyst and functionalization of poly(ethene-co-4-vinylcyclohexene) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 577-584 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary New functional copolymers consisting of ethene and 4-vinylcyclohexene (4-VCH) were synthesized by a stereorigid metallocene/methylalumoxane catalyst. The content of 4-VCH depends on the polymerization temperature, thus influencing the polymeric properties. Investigations of the microstructure were made using 13C NMR spectroscopy, thus revealing that 4-VCH is inserted regioselectively into the growing polymer chain. Hydroboration of selected copolymers followed by an oxidative workup yielded polyacohols which display different polymeric properties than the precursor
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342449
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Metal polymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 569-576 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Styrene-co-ethyl methacrylate colloids were obtained by codeposition at 77 K of the monomers with several metals such as Pd, Au, Ag, Cu, Zn, Cd, Ga, In, Ge, Sn, Sb and Bi. The colloids were polymerized with different amounts of initiator (BPO) at 65°C for 3.5 h and a wide range of viscosity average molecular weights (MV, 104–105 g/mol) were obtained depending upon the metal used. The metal colloid concentration and stability are reported. The medium particle size of In comonomer colloids was 49 å. The thermal stability and metal composition are also described. The copolymers are stable even at 310°C; Pd-poly(styrene-co-ethyl methacrylate) being the most stable. The metal content ranging between 0.11 and 3.76% w/w for the highest MW fraction and between 0.08 and 0.96% w/w for the lowest MW fraction. Copolymers with different colors were obtained depending on the metal used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342448
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Determination of end groups in poly(methylmethacrylate peroxide) by fast atom bombardment mass spectrometry and IR spectroscopy (1996)
    Springer
    Polymer bulletin 37 (1996), S. 785-790 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A detailed comprehensive investigation has been made to unequivocally analyse the end groups of a vinyl polyperoxide polymer namely, poly(methylmethacrylate peroxide), PMMAP, using Fast Atom Bombardment Mass Spectrometric (FABMS) technique. Further evidence to FABMS analysis has been sought from IR spectroscopic analysis on the same polymer. It has been found that PMMAP contains both hydroxyl and hydroperoxide end groups which has been explained by the chain transfer reaction of growing chain with the degradation product of PMMAP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295778
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Swelling and photoelastic behaviour of ionized hydrogels of poly(acrylic acid) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 791-798 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The photoelastic and swelling behaviour of poly(acrylic acid) gels swollen in 1 M NaCl aqueous solution was studied as a function of crosslinking degree (1–5 wt.% ethylene glycol dimethacrylate) and degree of ionization αg = 0 − 1. The degree of swelling passes through a minimum at αg ≐ − 0.15 regardless of the degree of crosslinking, probably due to the formation of hydrogen bonds between ionized and nonionized carboxyl groups. In the same neutralization region, the equilibrium modulus reaches a maximum; on the other hand, the modulus related to the dry state is independent of α for all crosslinker concentrations. Thus the mechanical behaviour of poly(acrylic acid) gels is in accord with the Gaussian theory and no contribution of permanent physical interactions to the modulus is observed. The optical behaviour is more complex — the sign of the stress-optical coefficient C e changes three times with increasing α due to the orientation of the side groups. The analysis of the optical data shows that the C e value is controlled by the degree of swelling and by the ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295779
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Thermotropic polyester: the influence of the spacer on the physical properties (1996)
    Springer
    Polymer bulletin 36 (1996), S. 369-373 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thermotropic polyesters prepared from series of 4,4′-dihydroxy-α,w-diphenoxy alkanes and 4,4′-dichloroformyl-α,w-diphenoxy alkanes are well known. The substitution of a methylenic spacer by an oxyethylenic spacer in the main chain of these polyesters drastically modifies their physical properties, particularly the mesogenic transition temperatures, as can be observed by DSC and thermooptical analysis. The thermal stability and the polymer solubility in common organic solvents of these polymers did not show a significant change. The physical properties of the two thermotropic polyesters prepared in diphenyl ether were evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319239
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Indexed in current contents (1996)
    Springer
    Polymer bulletin 36 (1996), S. A5 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319242
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Effect of added homopolymer on the microphase separation transition temperature of block copolymer (1996)
    Springer
    Polymer bulletin 36 (1996), S. 375-381 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The change in the microphase separation transition temperature (Tmst) of a diblock copolymer (AB), induced by the addition of homopolymer (HA), is theoretically studied. The calculations based on the modified Meier's theory show that Tmst is dependent on both the volume fraction of added homopolymer and the molecular volume ratio of HA to AB, which is the same as the previous theoretical results and qualitatively in agreement with the experimental results. This theory also predicts that the molecular weight ratio at the crossover of Tmst from elevation to depression is affected by the molecular weight of AB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319240
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    Green electroluminescent diode from poly(2-trimethylsilyl-1,4-phenylene vinylene) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 383-390 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Poly(2-trimethylsilyl-1,4-phenylenevinylene) (TMS-PPV) was synthesized through a organic-soluble precursor polymer, and its properties were characterized by UV-visible, FT-IR spectroscopy and thermal anaylsis. The EL devices were fabricated with TMS-PPV as an emitting layer, and ITO and aluminum as positive and negative electrodes, respectively. Threshold voltage of the device was about 15 V and the emission maximum was at about 540 nm with quantum efficiency of 3.5x10-4% photons per electron in air and room temperature condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319241
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Poly(oligo-oxyethylene methacrylate-co-alkali metal acrylamidocaproate) as a single ion conductor (1996)
    Springer
    Polymer bulletin 36 (1996), S. 427-433 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The new single ion conductors, poly(oligo-oxyethylene methacrylate-co-alkali metal acrylamidocaproic acid) ((CH2CCH3COO(CH2CH2O)9H)x−(CH2CHCONH(CH2)5 COO-M+)1-x), M+=Li+, Na+, K+, were synthesized and the effects of the cation and the temperature on ionic conductivity were investigated. The alkyl spacer in the alkali metal acrylamidocaproate was introduced to increase the flexibility of the side chain for the complex formation between the ionic groups and the oxygens in PEO unit. The room temperature(30°C) conductivity of the K single ion conductor was found to be 5x10-7 S/cm which is the highest value reported for the single ion conductors having carboxylate groups without any additives. The pseudo-activation energy in the VTF equation was not dependent on the type of the cation, which indicates that the ion hopping rate is higher than the string renewal rate in these single ion conductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315059
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Synthesis and properties of poly(dipropargyl-16-crown-5) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 391-398 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary We have synthesized a polyacetylene derivative, poly(dipropargyl-16-crown-5), through the cyclopolymerization of the corresponding monomer by metathesis catalysts. The polymer containing crown-ether units was characterized by spectroscopic and thermal techniques. The polymer structure is believed to be a cyclized from with both five- and sixmembered rings. The polymer exhibits high cation-binding properties and ionochromic effects. The order of the selectivity of alkali- metal cations for both the monomer and the polymer was found to be Na+〉K+〉Li+ and the polymer shows the largest red shift by approximately 40 nm in λmax for Na+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315054
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Preparation and solution properties of uniform three-arm star poly(methyl methacrylate) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 399-405 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Syndiotactic (st-) poly(methyl methacrylate) (PMMA) with a hydroxy group at the chain end (st-PMMA-OH) was prepared by st-living polymerization with t-C4H9Li/(n-C4H9)3Al in toluene at -78°C. The resulting st-PMMA-OH was fractionated into uniform polymers by means of supercritical fluid chromatography. Uniform st-PMMA-OH with degree of polymerization of 26 was reacted with 1,3,5-benzenetricarbonyl trichloride as a coupling agent and the three-arm star polymer uniform with respect to branch length was isolated from the reaction mixture by the aid of gel permeation chromatography (GPC). Viscometric property of the uniform star PMMA was studied in some detail by using a GPC-differential viscometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315055
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Effect of allylic halides on catiomic polymerization of 1,3-pentadiene (1996)
    Springer
    Polymer bulletin 36 (1996), S. 443-447 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The cationic polymerization of 1,3-pentadiene (PD) initiated by AlCl3 in n-hexane was carried out in the presence of allylic halides, i.e., 3-chloro-1-butene, allyl chloride, and allyl bromide. All these allylic halides strongly hindered crosslinking which is a major side reaction during PD cationic polymerization. Cyclization, another side reaction, was also reduced by the addition of the allylic halides. The influences of these halides on polymer yields and molecular weights are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315061
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Investigations into the AIBN initiation steps in the free radical polymerisation of acrylonitrile by the aminoxyl trapping technique (1996)
    Springer
    Polymer bulletin 36 (1996), S. 435-441 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A modification of the radical trapping technique employing the stable nitroxide 1,1,3,3-tetramethyl-2,3-dihydro-1 H-isoindol-2-yloxyl, has been used to study the reaction of cyanoisopropyl radicals with acrylonitrile. By keeping the concentration of the aminoxyl radical very low (strategically added via a syringe pump), the addition of acrylonitrile to cyanoisopropyl radicals becomes competitive with radical trapping. Thus, sufficient quantities of alkoxyamines produced by the trapping of ‘second generation’ carboncentred radicals (cyanoisopropyl plus one monomer unit), and even ‘third generation’ carbon-centred radicals were obtained for identification by HPLC/MS techniques. Trapping by traces of adventitious oxygen was also competitive and the various peroxy radicals thus formed, underwent addition to acrylonitrile followed by further reaction or trapping by the aminoxyl. *** DIRECT SUPPORT *** AEB03077 00003
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315060
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Further studies on styrene polymerization using diphenylzinc-additive systems (1996)
    Springer
    Polymer bulletin 36 (1996), S. 449-454 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Diphenylzinc-water-organic monochloride systems, Ph2Zn-H2O-RCl, with n-, sec- and tert-butyl chloride (t-BuCl) and benzyl chloride (BzCl), were used to induce styrene polymerization. Improvement in polymer conversion is in concordance with the enthalpy of dissociation of the organic chloride employed. Polymerization results suggest that systems with t-BuCl and BzCl proceed by coordinate cationic propagation. Obtained polystyrene was atactic with up to 75% syndiotactic triads detected by 1H-NMR spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315062
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Preliminary analysis of the 1H-NMR and 13C-NMR spectra of poly(5-methoxy-2-vinyl thiophene) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 463-469 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 5-Methoxy-2-vinylthiophene was synthesized from the corresponding aldehyde. The monomer was polymerized under free radical conditions using AIBN as the initiator. High field 1H-NMR and 13C-NMR spectra of the polymer displayed several resonances that were sensitive to polymer stereochemistry. Analysis of these resonances showed that the polymer had an atactic sterochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315064
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Study of bulk chain-coupling reactions (1996)
    Springer
    Polymer bulletin 36 (1996), S. 455-462 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Block copolymers containing polyester and polyamide blocks have been prepared by the bulk reaction of the corresponding carboxy-terminated polymers with 2,2′-bis(2-oxazoline) or 2,2′-bis(5,6-dihydro-(4H)-1,3-oxazine) as chain-coupling reagents (CC). A two-step reaction has been used, involving (i) the reaction of polyamide with CC excess, and (ii) the addition of polyester, leading to a random distribution of blocks in the final block-copolymer. 1H and 13C NMR studies show that the coupling reaction takes place in the expected way. The stability of the resulting polymers is higher than that of the starting oligomers, and DSC indicates a phase separation between polyester and polyamide phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315063
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Estimation of the linear thermal expansion coefficient in friction-deposited, oriented poly(tetrafluoroethylene) films by temperature-dependent lateral force microscopy (1996)
    Springer
    Polymer bulletin 36 (1996), S. 471-476 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Preliminary lateral force microscopy (LFM) results are presented which were obtained at different temperatures on thin films of poly(tetrafluoroethylene) prepared by friction deposition. Chain-chain distances of rodlike poly(tetrafluoroethylene) macromolecules were determined as a function of temperature from LFM images which exhibit molecular resolution. The value of the linear thermal expansion coefficient in the chain-perpendicular direction was estimated to be 3.5x10-3 [1/°C] in the temperature range between+10°C and+40°C. This value is higher than the literature data quoted for the temperature range between 0 °C and 25 °C. Possible reasons for this deviation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315065
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Relationships between nonlinear dynamic viscoelasticity and fatigue behaviors of glassy polymer under various fatigue test conditions (1996)
    Springer
    Polymer bulletin 36 (1996), S. 477-482 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Fatigue behavior of amorphous polystyrene (PS) under various cyclic strain conditions was investigated on the basis of nonlinear dynamic viscoelastic measurement at various ambient temperatures. The degree of nonlinear viscoelasticity under tension-compression type cyclic strain was greater than that under tension or compression type ones. The longest fatigue lifetime and the shortest one were observed under compression and tension type fatigue tests, respectively. The fatigue lifetime decreased with an increase in nonlinear viscoelastic parameter (NVP) in the case of the same type of cyclic strain conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315066
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    The effect of curing on the crystallization of poly(phenylene sulfide) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 489-493 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Poly(phenylene sulfide) (PPS) was cured in the melt and solid states under air and/or nitrogen environments. Crystallization behavior of such cured materials as a function of cure time at 320°C and 255°C was studied via differential scanning calorimetry. It was found, on general, that while “short-time” curing leads to an increase in crystallization rate, prolonged curing leads to a decrease in both crystallinity and crystallization rate. In contrast to the enhanced crystallization rate caused by curing in nitrogen at the melt state, no significant change of crystallization rate is observed while curing is done in the solid state (in nitrogen).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315068
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Characterization of viscoelastic properties of polyacrylamide/Cr(III) hydrogels (1996)
    Springer
    Polymer bulletin 36 (1996), S. 483-487 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The viscoelastic properties of polyacrylamide/Cr(III) hydrogels were characterized with the help of oscillatory shear rheometer. The serrated-plate geometry rather than the cone-plate geometry was used in order to avoid the slip effect. The dynamic storage modulus (G') increased with increasing polyacrylamide and/or Cr(III) concentrations. The mean molecular weight of the chains adjoining adjacent crosslinks (Mc), calculated according to the elastic rubber theory, exhibited the same order of the primary polymer. G' decreased with increasing monovalent salt concentration, owing to the polyelectrolyte effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315067
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Poly(ethylene-co-vinyl alcohol-co-vinyl mercaptoacetate) (EVALSH)-determination of the vinyl mercaptoacetate content by thermogravimetric analysis and FTIR spectroscopy (1996)
    Springer
    Polymer bulletin 36 (1996), S. 593-600 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A quantitative method for the determination of vinyl mercaptoacetate (VMA) in poly(ethylene-co-vinyl alcohol-co-vinyl mercaptoacetate) (EVALSH) based on Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) was developed. A plot of relative absorbance values (A1736/A720) versus esterification degree in EVALSH samples determined by TGA analysis revealed a good linear relationship.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342451
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Stereoisomers composition of 4-[(1′-methylpropyl)-oxycarbonyl]-2-oxetanone and related compounds, as precursors of fuctional polyesters, determined by chiral gas chromatography (1996)
    Springer
    Polymer bulletin 36 (1996), S. 585-592 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The configurational analysis of racemic and optically active stereoisomers of 4-[(1′-methylpropyl)oxycarbonyl]-2-oxetanone has been carried out by using chiral gas chromatography. This technique has been successful in the stereoisomers composition determination of these β-substituted β-lactones prepared by two different routes and used as monomers in the preparation of malic acid stereocopolymers. Result are in good agreement with those obtained from high resolution 1H NMR, in the presence of an Europium salt, as chiral shift reagent. This method has been extended to 3-methyl-4-[(1′,2′,2′-trimethyl propyl)oxycarbonyl]-2-oxetanone. The exact knowledge of precursors configurational structure is very important in regard to the obtention of the corresponding polystereoisomers with a strictly controlled enantiomeric or diastereoisomeric composition and consequently with predictable properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342450
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Plasma polymer thin films of zinc phthalocyanies for NO2 gas sensor device (1996)
    Springer
    Polymer bulletin 36 (1996), S. 601-607 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342452
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    The behavior of interfacial polycondensation on synthesizing of poly(amic-ester)s: homogeneity of the interfacial films (1996)
    Springer
    Polymer bulletin 36 (1996), S. 609-616 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The behavior in interfacial polycondensation of 4,4-methylenedianiline (MDA) or 4,4-oxydianiline (ODA) in water with dimethoxycarbonylterephthaloyl chloride (DCMTC) in dichloromethane with benzyltriethylammonium chloride (BTEAC) as the catalyst was examined with a Raman imaging microscope, and scanning electron microscope. The surfaces of the polymers adjacent to the water phase had higher average molecular weight than the surfaces of the polymers adjacent to the organic phase. Moreover, the morphology of the films also changed from dense to porous along the thickness direction of the films. To obtain an interfacial film more homogeneous in morphology and molecular weight, the reaction time of interfacial condensation should not exceed 5 minutes in this system. The interfacial films were anisotropic. The chain axis of the poly(amic-ester)s mainly oriented perpendicularly to the interface in the direction of membrane growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342453
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    The effect of crosslinking on the glass transition temperature and the density of diethylene glycol bis(allylcarbonate) polymer networks (1996)
    Springer
    Polymer bulletin 36 (1996), S. 617-621 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The effect of crosslinking on the glass transition temperature and the specific volume of poly(diethylene glycol bis(allyl carbonate)) networks was studied using a series of networks with progressively decreasing density of crosslinks. The networks were prepared by a bulk copolymerisation of ethylene glycol bis(allyl carbonate) with an increasing amount of allyl ethoxyethyl carbonate. It was found that their glass transition temperature determined by the Dynamic Mechanical Thermal Analysis decreases linearly with increasing concentration of the monoallyl comonomer whilst the increase in their specific volume is non-linear. This is explained by the non-equilibrium state of the networks at the temperature of the specific volume measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342454
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Rheological investigation of form relaxation and interface relaxation processes in polymer blends (1996)
    Springer
    Polymer bulletin 36 (1996), S. 637-643 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Transmission electron microscopical and rheological investigations have been performed on polymer blend systems of the type A/B, A/A-b-B/B, and A/C-b-B/B, where B is poly(methyl methacrylate) as the continuous and A is polystyrene as the dispersed phase. A-b-B is the corresponding diblock copolymer, and C-b-B is a diblock copolymer with poly(cyclohexyl methacrylate) (C) being thermodynamically miscible with A. The sphere-size distribution was estimated from the TEM data and found to be monomodal for all blends. Smaller sphere sizes in the A/C-b-B/B blends compared with the A/A-b-B/B blends prove the efficiency of the enthalpic acting compatibilizer. The rheological material functions G′ and G″ were used to calculate relaxation time spectra and to determine characteristic relaxation times. The form relaxation time τ1 for the relaxation of the ellipsoidally deformed soft PS-particles back to spheres have been verified for all blends no matter whether they where compatibilized or not. An additional relaxation time τβ was found for both types of compatibilized blends. This time is assigned to a non-isotropic interfacial stress, which may arise from relaxation processes of the block copolymers at the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342457
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Polymer crystal silverware: a fast method for the prediction of polymer crystal structures (1996)
    Springer
    Polymer bulletin 36 (1996), S. 645-652 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A method is presented for the fast prediction of polymer crystal structures. From a stable helical conformation of the polymer chain well packed three dimensional periodic starting structures are generated using an adapted version of M. Blanco's Molecular Silverware algorithm. These structures are then energy-minimised using classical molecular mechanics methods. The method only requires a rough estimate of the crystalline density. No information about crystal class, space group or cell parameters is necessary. Using this method, possible crystal structures of poly(ethylene ketone), Nylon-6,6 and poly(ethylene terephthalate) are calculated. Both the α- and β-structures of poly(ethylene ketone) are correctly predicted. For Nylon-6,6 the lowest-energy structure obtained corresponds to the experimental α-structure. For poly(ethylene terephthalate) a large number of structures are generated using the algorithm. Besides the experimental structure four structures are found with a lower energy than the experimental structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342458
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of aPP/aPS graft copolymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 687-694 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Graft copolymers of atactic polypropylene (aPP) and polystyrene (PS) were synthesized and characterized by 13C NMR analysis. The 13C NMR spectra of the grafts exhibited changes with respect to physical blends of identical compositions. The most important occurred in the meso sequences of the aPP blocks of the copolymer. These changes suggest that some grafting took place during the synthesis. SEM micrographs indicate greater interfacial interaction between phases in the copolymers than in the physical blends. Thermal Analysis showed that the Tg of the copolymers is higher than that of the PS homopolymers prepared under the same conditions. This could be the result of an apparent increased in molecular weight caused by the grafting of the aPS into the aPP chains. TGA results indicated that the thermal stability of the copolymer decreases as the aPP content in the copolymer increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338631
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of liquid crystalline polystyrenes with disiloxane linkage in the spacer (1996)
    Springer
    Polymer bulletin 36 (1996), S. 653-658 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Novel polystyrenes with mesogenic groups as p-substituents connected through disiloxane-containing spacer are synthesized by anionic and radical polymerization and characterized. Some polymers are found to show smectic phases. Influences of the position of the siloxane linkage in the spacer, molecular weight and molecular weight distribution of the polymer on liquid crystallinity are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338626
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    The synthesis and characterization of polyethylene succinamide (polyamide 24) (1996)
    Springer
    Polymer bulletin 36 (1996), S. 659-665 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The current paper presents the synthesis of a new polyamide, polyethylene succinamide (polyamide 24), via interfacial and solution-solid phase polycondensation. The resulting product was characterized by means of elementary analysis, infrared spectrometry, 1H-nuclear magnetic resonance, intrinsic viscosity and differential carolimetry. The effects of polymerization conditions on molecular weight of the product and the solubility of polyamide 24 in a number of commonly used solvents were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338627
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Isotactic copolymerization of methyl methacrylate (MMA) with alkyl acrylates (1996)
    Springer
    Polymer bulletin 36 (1996), S. 667-671 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Copolymerization of methyl methacrylate(MMA) and alkyl acrylates [t-butyl(tBA) and 2-ethylhexyl(OA)] was realized from a short living pre-PMMA. The poly(MMA-co-tBA) and poly(MMA-co-OA) obtained with rac-Me2Si(Ind)2ZrMe2 were characterized as random isotactic copolymers. Whereas, corresponding syndio-rich atactic random copolymers were obtained with Cp2ZrMe2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338628
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Preparation of soluble and fluorescent poly(arylene)s by 1,3-dipolar polycycloaddition and properties of the polymers (1996)
    Springer
    Polymer bulletin 36 (1996), S. 673-679 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary 1,3-Dipolar polycycloadditions of 2,3,5,6-tetramethylterephthalodinitrile oxide with 3,6-diethynyl-9-hexylcarbazole or 2,6-diethynylpyridine afford novel soluble poly(arylene)s. The polymers show strong fluorescence in solutions as well as in cast films with peaks at 340–490 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338629
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Chitin/poly(methyl methacrylate) hybrid materials (1996)
    Springer
    Polymer bulletin 36 (1996), S. 681-686 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Graft copolymerization of methyl methacrylate onto mercapto-chitin has been examined. The copolymerization reaction proceeded efficiently in dimethyl sulfoxide at 80°C to give chitin-graft-poly(methyl methacrylate)s. The grafting percentage increased with the amount of the monomer and reached above 1200% under appropriate conditions. The resulting graft copolymers exhibited remarkable affinity for various common organic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338630
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Copolymerization of aromatic polyamide macromonomers with methyl methacrylate (1996)
    Springer
    Polymer bulletin 36 (1996), S. 703-707 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Graft copolymers of end methacrylate-functionalized[MacroAM] or styrene-functionalized[MacroAS] polyamide macromonomers with methyl methacrylate(MMA) were prepared by radical copolymerization, and their thermal, dynamic properties, and miscibility with matrix PMMA have been investigated. The glass transition temperature(Tg)s of the copolymers were significantly elevated with the increase of the macromonomer content in the copolymer. Storage modulus E′ of the graft copolymers began to decrease at around 85°C, which is close to Tg of PMMA, irrespective of the macromonomer content in the copolymers. As the macromonomer content and its degree of polymerization became higher, the drop in E′ became significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338633
    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...