Block/segmented polymers. A new method of synthesis of copoly(amide‐ester)‐ester polymer

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Abstract
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 (Tg) above room temperature and the other soft, amorphous (B) having Tg 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 by‐product to obtain segmented (amide‐ester)‐ester copolymer. The polymer showed mostly two Tgs one at −40 to −50°C and other at +40 to +50°C; and one melting temperature 200°C. Maxm inherent viscosity was recorded at 1.75 dL/gm. © 1993 John Wiley & Sons, Inc.