Abstract
AbstractTwo 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.
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