Dz. Ma et al., SYNTHESIS AND CHAIN STRUCTURE OF ETHYLENE TEREPHTHALATE EPSILON-CAPROLACTONE COPOLYESTERS, Journal of polymer science. Part A, Polymer chemistry, 36(16), 1998, pp. 2961-2969
A series of ethylene terephthalate-epsilon-caprolactone copolyesters (
TCL) with different hard segment contents were synthesized and charact
erized by GPC, NMR, and DSC. The analysis from high-field H-1-NMR reve
als that the transesterification between ET and CL segments during syn
thesis is unavoidable, so TCL copolyesters are segmented copolyesters
with certain random properties, as shown by the specific chemical and
sequence structure of TCL copolyester chains and as confirmed by their
crystallization behavior. The stress-strain test shows that TCL copol
yesters with different hard segment contents may possess rubberlike or
toughening plastic mechanical properties. (C) 1998 John Wiley & Sons,
Inc.