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Study of the crosslinking of polyvinyl alcohol by light‐sensitive tetrazonium salts
Author(s) -
Tsunoda Takahiro,
Yamaoka Tsuguo
Publication year - 1964
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.1964.070080328
Subject(s) - polyvinyl alcohol , materials science , polymer science , polymer chemistry , chemical engineering , composite material , engineering
It has been reported that some diazonium compounds make polyvinyl alcohol insoluble to water under ultraviolet irradiation. We found that tetrazonium salts have even stronger light‐hardening effects on polyvinyl alcohol than diazonium salts. We have studied by means of infrared spectra sensitive films consisting of polyvinyl alcohol and o‐dianisidinetetrazonium chloride‐zinc chloride double salts. After exposure of the film to ultraviolet rays, new absorption appeared at the 1250 and 1030 cm. ‐1 bands; these absorptions were considered to be the asymmetric ν(COC) and the symmetric ν(COC), respectively, in the infrared spectra. In ultraviolet spectra, new bands in the 260–270 mμ region appeared. Consequently it was concluded that the light‐hardening effect of tetrazonium salts to polyvinyl alcohol was accomplished by a mechanism in which tetrazonium salts reacted with the OH groups of polyvinyl alcohol and crosslinked linear polyvinyl alcohol by phenyl ether bonds to form a network structure.