화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.39, No.20, 3498-3504, 2001
Synthesis and characterization of new soluble poly(amide-imide)s derived from 2,2-bis[4-(4-trimellitimidophenoxy)phenyl]hexafluoropropane
A series of new soluble poly(amide-imide)s were prepared from the diimidedicarboxylic acid 2,2-bis[4-(4-trimellitimidophenoxy)phenyl]hexafluoropropane with various diamines by direct polycondensation in N-methyl-2-pyrrolidinone containing CaCl2 with triphenyl phosphite and pyridine as condensing agents. All the polymers were obtained in quantitative yields with inherent viscosities of 0.52-0.86 dL . g(-1). The poly(amide-imide)s showed an amorphous nature and were readily soluble in various solvents, such as N-methyl-2-pyrrolidinone, NN-dimethylacetamide (DMAc), N,N-dimethylformamide, pyridine, and cyclohexanone. Tough and flexible films were obtained through casting from DMAc solutions. These polymer films had tensile strengths of 71-107 MPa and a tensile modulus range of 1.6-2.7 GPa. The glass-transition temperatures of the polymers were determined by a differential scanning calorimetry method, and they ranged from 242 to 279 degreesC. These polymers were fairly stable up to a temperature around or above 400 degreesC, and they lost 10% of their weight from 480 to 536 degreesC and 486 to 537 degreesC in nitrogen and air, respectively.