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On the poly(vinyl alcohol)–iodine complexes
Author(s) -
Takamiya Hiroyuki,
Tanahashi Yumi,
Matsuyama Tosiki,
Tanigami Tetsuya,
Yamaura Kazuo,
Matsuzawa Shuji
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070501017
Subject(s) - vinyl alcohol , polymer chemistry , tacticity , boric acid , annealing (glass) , absorbance , materials science , polarizability , iodine , elongation , chemical engineering , chemistry , organic chemistry , molecule , composite material , polymer , polymerization , ultimate tensile strength , chromatography , engineering , metallurgy
The color development due to the complex formation of poly(vinyl alcohol) (PVA) with iodine increased with increasing syndiotacticity of PVA. Isotactic PVA showed no color development. The color development of syndiotacticity‐rich PVA film decreased with increasing annealing temperature for films before complexization, whereas that of atactic (commercial) PVA increased with it. Lower temperatures, the elongation of complex film, and the presence of boric acid enhanced the absorbance at 600 nm due to I − 5 . The complexes are assumed to be made by incorporation of polyiodines into aggregates of syndiotactic sequences in PVA. The polarizability and electric conductivity of complex films are investigated. © 1993 John Wiley & Sons, Inc.