Poly(ester amide)s derived from glycine, even-numbered diols, and dicarboxylic acids: Considerations on the packing

A new sequential poly(ester amide) derived from 1,12-dodecanediol, sebacic acid, and glycine was synthesized and characterized, its crystalline struct ure was studied with transmission electron microscopy and X-ray diffraction . The results were compared with results for a related polymer, derived fro m glycine, 1,6-hexanediol, and succinic acid, that produced a lower methyle ne/carbonyl ratio. The crystalline structures of both polymers corresponded to a periodic arrangement of two layers of hydrogen-bonded molecular chain s, whose polymethylene sequences mimicked the packing of polyethylene and t he majority of polyesters. (C) 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 1036-1045, 2001.