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  • Wiley-Blackwell  (19)
  • 1985-1989  (2)
  • 1975-1979  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Ring opening polymerization of L-methyl 2-(2-methyl-1-aziridinyl)acetate and its racemic stereoisomer: 13C NMR study (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2849-2859 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly[L(und D,L)-N-(methoxycarbonylmethyl)iminopropylen] (5) wurden durch kationische Polymerisation von Methyl-2-(2-methyl-1-aziridinyl)acetat (4) mit Dimethylsulfat als Initiator dargestellt. Die Stereoregularität des Polymers, das aus dem L-Aziridin 4 dargestellt wurde, wurde durch 13C NMR-Untersuchungen des L- und D,L-Polyesters 5 bestimmt. Es konnte gezeigt werden, daß die Öffnung des Aziridin-Rings hauptsächlich am unsubstituierten Methylenkohlenstoffatom stattfindet, unter Erhaltung der Konfiguration des asymmetrischen Kohlenstoffs zu mindestens 85%.
    Notes: Poly[L(and D, L)-N-(methoxycarbonylmethyl)iminopropylene] (5) were synthesized by cationic polymerization of methyl 2-(2-methyl-1-aziridinyl)acetate (4) in the presence of dimethyl sulfate as initiator. The stereoregularity of the polymer obtained from the L-aziridine 4 was determined by 13C NMR study of the L- and D,L-polyesters 5. It could be shown that the opening of the aziridine ring proceeds mainly at the unsubstituted methylene carbon atom, retaining the configuration of the asymmetric carbon to at least 85%.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021771004
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymerization reactivity ratios of p.vinylbenzophenone and p.dimethylamino styrene (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 229-232 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1986.140240507
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology and modulus-temperature behavior of semicrystalline poly(ethylene terephthalate) (PET) (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 591-602 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The influence of the thermal history on the morphology and mechanical behavior of PET was studied. The degree of crystallinity (density measurements) and the morphological structure (electron microscopy and small-angle x-ray diffraction) depend on the crystallization temperature. The viscoelastic parameters obtained from the modulus-temperature curves are mainly determined by the morphology of the samples. The glass-transition temperature, Ti, is a function of the crystallinity and the crystallization temperature. It is maximum for a crystallinity between 0.34 and 0.39 for a sample crystallized isothermally between 120 and 150°C. This dependence on crystallization conditions is ascribed to the conformation of the amorphous chain segments between the crystalline lamellae as well as the concentration and the molecular weight of the polymer material rejected during isothermal crystallization. Both factors are supposed to be temperature-dependent.The value of the rubbery modulus is a function of both the volume concentration of the crystalline lamellae and the structure of the interlamellar amorphous regions (chain folds, tie molecules, chain ends, and segregated low molecular weight material). Annealing above the crystallization temperature of isothermally crystallized samples has a marked influence on their morphology and mechanical behavior. The morphological structure and the viscoelastic properties of annealed PET samples are completely different from those obtained with samples isothermally crystallized at the same temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140402
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  • 4
    Electronic Resource
    Electronic Resource
    Radical block polymerization of vinyl chloride. I. Ozonized polypropylene oligomers as heterofunctional initiator (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 3077-3090 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isotactic polyproplyene has been peroxidized in the solid state by treatment with ozone at room temperature, eventually followed by treatment with oxygen at 100°C. The total active oxygen content - peroxides and hydroperoxides - was determined iodometrically, and the hydroperoxide content with triethyl arsine, following the method of Horner and Jürgens. Post-treatment with oxygen causes a very strong increase in total active oxygen content; the relative amount of hydroperoxides compared with that without oxygen treatment is, however, markedly decreased. The stability and rate of decomposition of PPO2 have been considered in relation to the solubility parameter of the different monomers and solvents. It was used at 30-40°C for initiating the emulsion polymerization of styrene, methyl-, and butyl methacrylate and methyl, ethyl, n-butyl, and 2-ethyl-hexyl acrylate. These polymers contain an average number of peroxide links per macromolecule, ranging between 7 and 23; they can be used for the block polymerization of a second vinyl monomer, e.g., vinyl chloride.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170161203
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of the reaction medium on the composition and the microstructure of styrene-acrylic acid copolymers (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 1879-1887 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two series of acrylic acid-styrene copolymers of various composition have been prepared in benzene and dimethylformamide in order to study their sequence distribution by using 13C NMR spectroscopy. The reactivity ratios in benzene were rA = 0.13, rA = 0.30 and in dimethylformamide rA = 0.05, rS = 1.60. Copolymers with the same overall composition but prepared in different media display marked differences in sequence distribution, the copolymers obtained in dimethylformamide always having longer sequences. For the series of copolymers prepared in dimethylformamide, the experimental percentages of acrylic acid-centered triads (SAS, SAA, AAA) disagree with the values calculated from the monomer reactivity ratios.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130812
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  • 6
    Electronic Resource
    Electronic Resource
    Photochromic behavior of copolymers of indolinospirobenzopyrane methacrylic derivatives (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 2415-2415 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170131025
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  • 7
    Electronic Resource
    Electronic Resource
    Photochemistry of nonconjugated bichromophoric systems: Photoreduction and photoreductive polyrecombination kinetics (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 215-225 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the photoreduction of benzophenone and the reductive photopolymerization of diaryl ketones are closely interrelated. The photoreductive polyrecombination presents the characteristics of a polycondensation, namely, an increase in molecular weight with reaction time. In the absence of side reactions, benzophenone and diketone Ia show identical behavior toward hydrogen abstraction, as is reflected in the di-bis rate constants of hydrogen abstraction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130120
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  • 8
    Electronic Resource
    Electronic Resource
    Photochemistry of nonconjugated bichromophoric systems: Photoreductive polyrecombination of diaryl ketones (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 227-252 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The irradiation of nonconjugated bichromophoric systems, diaryl ketones, with ultraviolet light in the presence of hydrogen donors, such as isopropanol or bisbenzhydrol, yields high polymers. Two series of arylketones were investigated, namely bisbenzophenones and bisketotriazoles. The cage reaction, which arises from the cross combination between the acetone ketyl and bisbenzophenone ketyl radicals, was estimated to be very small but may constitute a chain termination reaction in the photopolymerization in isopropanol. The photopolymerization of bisdiketone-dihydrol systems was found to yield polymers with much higher molecular weights than those obtained from the photopolymerization of bisdiketone-isopropanol systems. The photolysis of some binary mixtures of aromatic diketones in the presence of isopropanol yielded statistical copolypinacols. In some favorable cases, the NMR spectrum of the copolymer obtained showed three distinct linkages and from the infrared spectrum intensities the copolymers composition and the number average length of the sequences may be determined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130121
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  • 9
    Electronic Resource
    Electronic Resource
    1H and 13C NMR study of the prototropic tautomerism of 4(5)-vinyl-1,2,3-triazole in dimethylformamide as solvent (1978)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 578-579 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon-13 NMR study of 4(5)-vinyl-1,2,3-triazole in dimethylformamide at -55°C allows direct observation of the three separate tautomers. The 13C chemical shift values of the three forms, as well as their percentages in the tautomeric mixture, are given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270111110
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of reversible recombination of aromatic C-centered radicals (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 17 (1985), S. 735-747 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the reversible recombination of the 2-phenyl- (I), 2-p-methoxyphenyl-(II), and 2-p-nitrophenyl-3-oxo-2,3-dihydrobenzothiophene-2-yl (III) radicals have been investigated. Recombination rate constants of R(I-III) have been determined in different solvents (2k1 ∼ 109 M-1 s-1). The rate of reaction (I) with R(I-III) decreases with increasing solvent viscosity η. In the toluene-vaseline oil mixture (2 ≲ η ≲ 120 cP) the recombination of R(I-III) is molecular mobility limited. The thermodynamic parameters of reaction (I) have been determined: ΔH0 = 20-30 kcal/mol. Activation volumes ΔV1≠ for recombination of R(II) have been measured. In n-propanol ΔV1≠ is equal to the viscous flow activation volume of the solvent ΔVd≠. In toluene and chloroform ΔV1≠ 〈 ΔVd≠. For the last two solvents the activation volumes of the cage reaction have been estimated ΔV1≠(r) = -(2-3) cm3/mol. Visible-range absorption spectra and ESR spectra have been recorded for R(I-III). The role of cage effect in the reactivity anisotropy averaging of R(I-III) is discussed. The potential of the high-pressure tests for deriving information about the elementary act of a fast bimolecular reaction is considered.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550170704
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