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Polyimides from diisocyanates, dianhydrides, and tetracarboxylic acids
Author(s) -
Alvino William M.,
Edelman Leonard E.
Publication year - 1975
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.1975.070191103
Subject(s) - polyimide , diamine , reagent , polymer chemistry , amine gas treating , materials science , catalysis , polymer , organic chemistry , condensation polymer , moisture , chemistry , composite material , layer (electronics)
High molecular weight polyimide resins have been prepared by the reaction of diisocyanates and a mixture of dianhydrides and their acids in the presence of a tertiary amine catalyst. The polyimides thus formed can be made into tough flexible films similar to those polyimides prepared by the conventional method of reacting a dianhydride with a diamine. The preparation of high molecular weight polymer is affected by the purity of reagents, the anhydride‐acid ratio, temperature, and moisture. Evidence from model compound studies is presented regarding the nature of the reaction mechanism.