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Photo-oxidative degradation of polyvinyl alcohol and measurement of thermally stimulated current

✍ Scribed by H. Aoki; M. Uehara; T. Suzuki; A. Yoshida

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
283 KB
Volume
16
Category
Article
ISSN
0014-3057

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✦ Synopsis

An investigation was made of the correlation between changes in the chemical structure of polyvinyl alcohol during photo-oxidation and a thermally stimulated current. Photo-oxidation was initiated by dehydration and greatly accelerated as a result of chain scission, which resulted from the formation of carbonyl groups of ester, aldehyde, ketone and carboxylic acid types. Two main peaks of thermally stimulated current were observed at 220 and 250 K in photo-oxidized polyvinyl alcohol. It became clear that these two peaks, resulting from depolarization of dipoles, correspond to an increase in the content of carbonyl groups and a decrease in the content of hydroxyl group, respectively.

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