화학공학소재연구정보센터
Journal of Polymer Science Part A: Polymer Chemistry, Vol.33, No.7, 1039-1046, 1995
Synthesis and Characterization of Soluble Aromatic Polyurea-Amides from New N,N’-Dimethyl-N,N’ bis(Aminophenyl)Ureas and Aromatic Dicarboxylic-Acid Chlorides
Aromatic polyurea-amides having inherent viscosities of 0.36- 0.67 dL/g were synthesized by the low temperature solution polycondensation of new N,N’-dimethyl-N,N’-bis(aminophenyl)ureas with various aromatic dicarboxylic acid chlorides. All the polymers were amorphous, and most of them were soluble in a variety of organic solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide (DMAc), m-cresol, and pyridine. Some of the polymers could be cast from the DMAc solutions into transparent and flexible films having good tensile properties. The glass transition temperatures of the polyurea-amides obtained from the bis(4-aminophenyl)-substituted ureas were 244-272 degrees C. The temperatures of 10% weight loss under nitrogen of the polymers were in the range of 430 and 480 degrees C.