Abstract
NMR spectra of poly(ethylene terephthalate–sebacate–fumarate) and poly(ethylene terephthalate–sebacate–malonate) terpolyesters, which are obtained by ordinary molten-state polycondensation under reduced pressure, are studied. Ethylene glycol protons show six kinds of dyad sequences and their areas are measured by a curve resolver. Their relative intensities are in good accord with the calculated values for random (or Bernoullian) terpolymers. The relationships of three kinds of combination of two acid groups are plotted in the triangular coordinate system by normalizing the three kinds of dyad sequences. It is found that these three acid groups are randomly distributed.
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