SYNTHESIS, MISCIBILITY, AND PROPERTIES OF RODLIKE FLEXIBLE POLYMER COMPOSITES VIA IN-SITU ROD CHAIN FORMATION

Abstract

Flexible, solube poly(amic diethyl ester) precursors of rodlike poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA) and poly(4'4-oxydiphenylene biphenyl-tetracarboximide) (BPDA-ODA), which are more stable than the respective poly(amic acid)s and are not in the equiliration with the constituent anhydride and amine monomers so that chemical exchange reactions are prevented in their solution blending, were synthesized. Homogeneous precursor/precursor solutions with various compositions were obtained in N-methyl-2-pyrrolidinone with appreciably high solid contents. The dried precursor blend films and resulting polyimide composite films thermally imidized were optically transparent, regardless of compositions and film process conditions. The composites showed single T(g) behavior. Conclusively, rodlike BPDA-PDA/flexible BPDA-ODA molecular composites were achieved from the blend of the respective flexible poly(amic diethyl ester) precursors through conventional drying and imidization process. In addition, film properties of composites were characterized.