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Synthesis of diazoresin and its photocrosslinking reaction
Author(s) -
Cao Shuguang,
Zhao Chao,
Cao Weixiao
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199802)45:2<142::aid-pi856>3.0.co;2-q
Subject(s) - polymer science , materials science
Diazoresins with different specific viscosities were prepared from diphenylamine‐4‐diazonium salt and paraformaldehyde in concentrated sulphuric acid with different ratios of CH 2 O/−N 2 + X ‐ . In order to obtain a diazoresin with a specific viscosity in a given time at 0–5°C, more than a stoichiometric ratio was necessary. The photocrosslinking reaction of the diazoresins with various binder resins in solid film was investigated. The results show that the photocrosslinking reaction took place only in a system composed of diazoresin and binder resin containing −OH side‐chain groups. The photodecomposition of diphenylamine‐4‐diazonium salt and its diazoresin in alcohol was studied. It was demonstrated that the diphenylamine aryl cation formed on decomposition is the dominant intermediate. The photocrosslinking mechanism between diazoresin and binder resin is discussed in a preliminary way. © 1998 SCI.