Abstract
AbstractThe paper deals with the effect of intrinsic viscosity on thermal behaviour of polyimides prepared from 3,4,3′,4′‐benzophenone tetracarboxylic acid dianhydride and 4,4′‐diamino diphenyl ether. The polyamic acids with different intrinsic viscosities were synthesized by low temperature solution polycondensation in dimethylformamide. The polyimides were prepared by chemical or thermal cyclodehydration from polyamic acids. Thermal stability of the polyimides was evaluated by using dynamic thermogravimetric analysis in air and nitrogen atmosphere. Significant improvement in thermal stability was observed above a critical value of [η].
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