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
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