1975 Volume 32 Issue 11 Pages 672-677
Synthesis of poly (anidamic acid Schiff bases) is carried out by low temperature solution polycondensation of aromatic diamines with 4-chloroformyl phthalic anhydride and aromatic dialdehyde. In the polycondensation, the effects of the species of monomers and molar ratio of dialdehyde and 4-chloroformyl phthalic anhydride on the solubility of the polymers are studied. Soluble prepolymer, poly (amidamic acid Schiff base) is obtained from polycondensation of 4, 4′- methylenedianiline, 4, 4′-oxydianiline, or 4, 4′-thiodianiline with isophthalaldehyde and 4-chloroformyl phthalic anhydride in case that molar ratio of isophthalaldehyde, and 4-chloroformyl phthalic anhydride is lower than 50: 50. These soluble prepolymer can be converted to thermally stable poly- (amidimide Schiff bases) by suitable heating.
