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Structure of poly(vinyl alcohol)‐iodine complex formed in the amorphous phase of poly(vinyl alcohol) films
Author(s) -
Choi YoonSo,
Miyasaka Keizo
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.1993.070480215
Subject(s) - vinyl alcohol , tacticity , amorphous solid , thermal stability , polymer chemistry , phase (matter) , materials science , crystallization , hydrogen bond , chemical engineering , chemistry , polymer , molecule , crystallography , composite material , organic chemistry , polymerization , engineering
Abstract The effect of syndiotactivity of poly(vinyl alcohol) (PVA) both on the formation and thermal stability of the complex formed in the amorphous phase of PVA films is investigated, and then a model of the complex is presented. The amount of the complex formed in syndiotacticity‐rich PVA is much larger than that formed in atactic PVA under a given iodine‐soaking condition, and the former complex has a higher thermal stability in the soaking solution than the latter. The complex formed in the amorphous phase is proposed to have such a structure as that in which a linear polyiodine I 5 − or I 5 − with a 3.1 A˚ periodicity is enveloped by four PVA segments of syndiotactic configuration with extended conformation. In this model, these four PVA chains participating in a complex are supposed to be fixed by interchain hydrogen bonds. The observed X‐ray meridional intensity curve of iodinated PVA film can be explained by a series of two I 5 − . © 1993 John Wiley & Sons, Inc.