Structural data on the packing of poly(ester amide)s derived from glycine,hexanediol, and odd-numbered dicarboxylic acids

The crystalline structure of a series of Poly(ester amide)s derived from gl ycine, hexanediol, and odd-numbered dicarboxylic acids has been studied usi ng transmission electron microscopy and X-ray diffraction. Polymers crystal lize in an orthorhombic lattice with parameters a = 4.80, b = 22.68 Angstro m, and c in the 45-55 Angstrom interval, depending on the number of methyle nes of the chemical repeat unit. The structure of the glutaric derivative c an be interpreted as a singular packing of six hydrogen-bonded sheets. Amid e and ester interactions between neighboring layers favor two different she et arrangements that give rise to the observed superstructure. (C) 1999 Joh n Wiley & Sons, Inc.