ISSN:
1573-9171
Keywords:
H-complex
;
polyimide
;
diester of 3,3′,4,4′-benzophenonetetracarboxylic acid
;
diamine
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The kinetics of thermal imidization of various H-complexes of semiesters of bis(o-phthalic) acids with diamines was studied. The activation energy of the imidization was shown to increase with increasing pKa value of the diamine andE a value of the dianhydride and with decreasing nucleophilicity of the alcohol used for the synthesis of H-complexes. The experimental kinetic data and the results of quantum chemical calculations of the heats of formation of the initial H-complexes and transition states made it possible to propose a mechanism for the imidization reaction. This mechanism takes into account the catalytic effect of the carboxylic group of the semiester in theo-position with respect to the ester group.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00707046
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