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Cresylic soluble polyimides
Author(s) -
Sheffer Howard
Publication year - 1981
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.1981.070261130
Subject(s) - bpda , diamine , polyimide , solubility , polymer chemistry , thermal stability , pyromellitic dianhydride , condensation polymer , materials science , phenylene , chemistry , organic chemistry , polymer , layer (electronics)
Polyimides are prepared by reaction of dianhydrides with aromatic diamines under dehydrating conditions to insure conversion of the polyamic acids to polyimides. Cresylic acid solubility is observed only for cyclopentane dianhydride and benzophenone dianhydride. Most of the batches are made from BPDA, since it is the preferred dianhydride for thermal stability. Of 19 aromatic diamines only 2,4‐ and 2,6‐diaminotoluene, 2,4‐diaminoanisole, 4,5‐dimethyl‐1,2‐phenylene diamine and 1,5‐diamino‐4,8‐dihydroxyanthraquinone contribute a great deal toward making soluble polyimides of BPDA. 2,4‐Diamino‐acetanilide when used as the only diamine also gives a soluble polyimide with BPDA. The solubility of polyimides can be correlated with their solubility parameters, their symmetry, and their tendency to hydrogen bond.