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Thermal degradation of polymers. Part XVIII. The synthesis and characterization of quinazolone pre‐polymers
Author(s) -
Chan H. S. O.,
Still R. H.
Publication year - 1978
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.1978.070220810
Subject(s) - polymer , condensation polymer , vapor pressure osmometry , polymer chemistry , decarboxylation , polyester , differential scanning calorimetry , materials science , thermal analysis , osmometer , dehydration , chemistry , vapor pressure , organic chemistry , thermal , thermodynamics , biochemistry , physics , catalysis
A series of quinazolone pre‐polymers have been prepared from 4,4′‐diaminodiphenyl‐3,3′‐dicarboxylic acid and aromatic diacetamido compounds by melt polycondensation. The pre‐polymers have been characterized by combustion analysis, viscometry, vapor pressure osmometry, and thermal analytical methods (TG, DTA, and DSC). Structures have been elucidated by spectroscopic methods (IR and NMR). The thermal cyclization of these pre‐polymers to the partial ladder polyquinazolone has been studied and optimized using IR, DSC/DTA, TG, and evolved gas analysis. The cyclization behavior of these systems has been resolved in terms of concurrent dehydration and decarboxylation.