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  • 1
    Electronic Resource
    Electronic Resource
    Isothermal cis-trans isomerization behavior of polyacetylene films (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 581-585 
    Details
    ISSN: 0887-6266
    Keywords: polyacetylene ; isothermal cis-trans isomerization ; DSC ; stretched exponential function ; activation energy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Isothermal cis-trans isomerization behavior was studied by differential scanning calorimetry for conventional Shirakawa polyacetylene (S-PA) film and highly stretchable polyacetylene (hs-x) films synthesized using catalysts aged at high temperature. The rate of isomerization is slower for S-PA than for hs-x. Kinetic results of isomerization are analyzed by a stretched exponential function with exponent n (0 〈 n 〈 1), which is different from the previously assumed single exponential function. An activation energy of 31 kcal/mol was obtained for all the samples. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330407
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal isomerization and morphology of various polyacetylene films (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 587-593 
    Details
    ISSN: 0887-6266
    Keywords: polyacetylene ; higher-order structure ; cis-trans thermal isomerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two DSC exotherms for cis-trans thermal isomerization of polyacetylene (PA) films were found near 145 and 170°C. These exotherms are related to the higher-order structure of PA films, depending on the sample preparation conditions. The high-temperature peak corresponds to ordered crystallites (A state), which is prominent in conventional Shirakawa polyacetylene (S-PA) and moderately stretchable PA (ms-PA) films. The low-temperature peak corresponds to disordered crystallites (B-state) found in highly stretchable PA (hs-x) films. The distribution of crystalline order in the B state depends on the materials. The A state is transformed to B state upon stretching of ms-PA, but the B state is not transformed to A state by stretching. The supermolecular structure is discussed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330408
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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