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  • 1
    Electronic Resource
    Electronic Resource
    Thermotropic homopolyesters. III. Preparation and properties of polymers based on 4′-hydroxyphenyl-4-hydroxycinnamate (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 21 (1983), S. 1851-1872 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Low-molecular-weight 4′-acetoxyphenyl-4-acetoxyoinnamate, as well as several polyesters synthesized from this monomer and aliphatic dibasic acids, exhibit thermotropic nematic phases. DSC heating curves for all of the polymers exhibit multiple transitions. The amount of crystallinity of these polymers at room temperature is small and the degree of order along the chain axis in the crystalline phase is poor. For the lower homologues the nematic phase exists over a broad temperature range of approximately 100°C. The polyester from chiral (+)-3-methyl adipate forms a thermotropic cholesteric phase. Both the diacetoxy monomer and azelate polymers of low molecular weight adopt the homeotropic texture on glass slides, but with increasing molecular weight the planar texture becomes preferred. Investigation of the effects of electric fields in the conduction regime upon the nematic phase of the diacetoxy monomer revealed that Williams domains are formed only with difficulty. In most cases, a stationary pattern appeared instead. At higher voltage the dynamic scattering mode (DSM) was obtained, and above this a field-induced transition to the isotropic phase. The azelate polyesters exhibited Williams domains and the DSM in the conduction regime. The formation time for Williams domains was fairly short for polymers having ηinh 〈 0.44 dL/g, but increased to 80 min when ηinh = 0.68 dL/g. The DSM was only observed for polymers having ηinh 〈 0.61 dL/g. For these polymers the critical frequency separating the conduction and dielectric regimes exhibits a stronger temperature dependence than that of low-molecular-weight nematogens. A new instability pattern is reported for the azelate polyesters in the dielectric regime.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.180210920
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  • 2
    Electronic Resource
    Electronic Resource
    Light scattering study of the swelling process of poly(acrylonitrile-co-butene)-graft-poly(acrylonitrile-co-methylacrylate) film (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 219-224 
    Details
    ISSN: 0959-8103
    Keywords: copolymer ; film ; light scattering ; swelling ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The time evolution of the size and density of the swollen domains during the swelling of poly(acrylonitrile-co-butene)-graft-poly(acrylonitrile-co-methylacrylate) film in methanol was studied by light scattering measurements. The observed scattered light intensity was analyzed by the Guinier plot. The time evolution of the mean radius R(t) and number density N(t) of the swollen domains was given by R(t)3 ∼ t0.12 and N(t) ∼ t1.42.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210350301
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  • 3
    Electronic Resource
    Electronic Resource
    Photoacoustic study of lysozyme in water (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 2951-2953 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360231217
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  • 4
    Electronic Resource
    Electronic Resource
    Laser light scattering of PBLG in DMF (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 1461-1487 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report measurements of static and dynamic properties of poly(γ-benzyl-L-glutamate) (PBLG) in dimethyl formamide at 25 °C using laser light scattering. Correlation-function profile analyses were performed using the histogram method. The resultant average linewidth and dispersion were reconfirmed using the cumulants method. We were able to determine the molecular-weight distribution of PBLG using the histogram method and to confirm the polydispersity for rod polymers in solution to be roughly Mw/Mn ∼ 1 + μ2/Γ2. In our analysis of the Rayleigh linewidth, we used both the rigid-rod model and the Fujime approach involving rod flexibility. We obtained very reasonable agreement between the Fujime theory and our experiments and concluded that for most stiff polymers of interest, it would be more appropriate to use the Fujime approach, which could also yield a rod-flexibility parameter. In semidilute solutions, we observed two effects, namely, a maximum in the diffusion coefficient and a broadening of the linewidth distribution function at both low and high frequencies, which were not predicted by the Doi-Edwards theory.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220604
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  • 5
    Electronic Resource
    Electronic Resource
    Resonance inverse Raman spectra of β-carotene and carotenoid in photosynthetic bacteria (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 2701-2705 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360201216
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