BLOCK SEGMENTED POLYMERS - A NEW METHOD OF SYNTHESIS OF COPOLY(AMIDE-ESTER) ESTER POLYMER

A new method of preparation of segmented copolymer amide-ester type is described here starting from two oligomers, one hard crystallizable (A) having a glass transition temperature (T(g)) above room temperature and the other soft, amorphous (B) having T(g) well below room temperature. A, an oligo amide-ester terminated with hydroxyl groups has been synthesized from bis (hydroxy acylo amide) alkane, a reaction product of a lactone and diamine and dicarboxylic acid. B, an oligoester hydroxyl terminated was synthesized by the conventional method. The two oligomers A and B were transesterified removing diol as byproduct to obtain segmented (amide-ester) -ester copolymer. The polymer showed mostly two T(g)s one at -40 to -50-degrees-C and other at +40 to +50-degrees-C; and one melting temperature 200-degrees-C. Max(m) inherent viscosity was recorded at 1.75 dL/gm.