An optically active bulky aromatic diacid chiral monomer,(2S)-4-[(4-methyl-2-phthalimidylpentanoyl-amino) benzoylamino]isophthalic acid(1),containing a rigid ph
A series of new optically active poly(amide-imide)s were synthesized by direct polycondensation reaction of 4,4’-diaminochalcone with several N-trimellitylimid