Novel Organosoluble Poly(amide‐imide)s Derived from Kink Diamine Bis[4‐(4‐trimellitimidophenoxy)phenyl]‐diphenylmethane. Synthesis and Characterization

A new kink diimide-dicarboxylic acid, 2,2-bis[4-(4-trimellitimidophenoxy)phenyl]diphenylmethane (BTPDM), was synthesized by the condensation reaction of bis[4-(4-aminophenoxy)phenyl]diphenylmethane (BAPDM) with trimellitic anhydride. A series of new poly(amide-imide)s were prepared by direct polycondensation of BTPDM and various aromatic diamines in N-methyl-2-pyrrolidinone (NMP) using triphenyl phosphite and pyridine as condensing agents. The polymers were produced in high yield revealing moderate to high inherent viscosities of 0.80-0.89 dL.g -1 . Wide-angle X-ray diffractograms revealed that the polymers are amorphous. Most of the polymers exhibit good solubility and could be readily dissolved in various solvents such as NMP, N,N-dimethylacetamide (DMAc), N,N-dimethylformamide, dimethyl sulfoxide, pyridine, cyclohexanone and tetrahydrofuran. These poly(amide-imide)s have glass transition temperatures between 244-248°C and show 10% weight loss in the range of 453-469°C under a nitrogen atmosphere. The tough polymer films, obtained by casting from DMAc solution, had tensile strengths ranging between 82 and 95 MPa and tensile moduli ranging between 1.7 and 1.9 GPa.