SYNTHESIS AND REACTIONS OF 4,4'-ISOPHTHAL OYLBISPHTHALIC ANHYDRIDE BASED POLYISOIMIDE WITH NUCLEOPHILIC-REAGENTS

The laws of cyclization of polyimide acids based on 4,4-isophthaloylbi sphthalic anhydride and m-phenylenediamine in N-methylpyrrolidone in t he presence of N,N'-dicyclohexylcarbodiimide and polymer-analogous tra nsformations of the resulting polyisoimide in reactions with tertiary amines and 2-hydroxyethyl methacrylate were studied. Isoimide-imide re arrangement occurs in the presence of tertiary amines: the higher the basicity of nucleophilic reagent, the higher its efficiency in this re action. It was shown that polyisoimide almost quantitatively converts to the corresponding polyimide in the presence of 1,8-diazabicyclo[5.4 .0]undec-7-ene in solution under mild conditions. Reaction of polyisoi mide with 2-hydroxyethyl methacrylate yields unsaturated poly(amidoest er), which can be used as a polymeric basis for microlithographic mate rials.