Polyimides from 4,4′‐(alkylene‐α,ω‐dioxy) bis(phenylsuccinic anhydride)s and bis(phenylglutaric anhydride)s

Abstract

Abstract4,4′‐(Alkylene‐α,ω‐dioxy)bis(phenylsuccinic anhydride)s and bis(glutaric anhydride)s were obtained by the condensation of 4,4′‐diformyl‐α,ω‐diphenoxyalkanes with ethyl cyanoacetate followed by the addition of potassium cyanide or meldrum acid (2,2‐dimenthyl‐1,3‐dioxane‐4,6‐dione), hydrolysis with concentrated hydrochloric acid, and dehydration with acetic anhydride. Alkylene groups were ethylene, trimethylene, and tetramethylene. Polyimides were prepared from these anhydrides with 4,4′‐diaminodiphenyl ether, 4,4′‐diaminodiphenyl sulfide, and 4,4′‐diaminodiphenylmethane through thermal ring closure of polyamic acids obtained by solution polymerization in dimethylacetamide, and thermal stability of these polyimide film was examined by thermogravimetric analysis.