Abstract
Dichroism analysis of polyenes produced in PVA films was carried out for films stretched (at 80°C) after heat treatment (at 170°C) and films heat-treated after stretch. The relation between R s (stretch ratio of the film) and R d, n (dichroic ratio of n conjugated polyene) in the former case fitted the theoretical curves, but in the latter, high R d, n values regardless of R s were observed. Stretching of the film might promote both polyene formation and cross-linking dehydration, especially on the segments oriented in the stretch direction.
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