The analysis of the triad sequence of a poly(ethylene/butylene terephthalate) copolymer using 600 MHz 1 H NMR is reported in a solvent system of o -chlorophenol/deuterated chloroform mixture (75/25 v/v) at 80 °C. The well-resolved alcoholic CH 2 proton peak of the glycol units made the detailed sequence analysis possible. Exact peak assignment was performed with two special NMR experiments: a 13 C-labeling experiment and a two-dimensional heteronuclear multiple bond correlation (HMBC) observation. The number-average sequence lengths calculated from the triad sequences by 1 H NMR were in good agreement with those from the dyad sequences by 13 C NMR. From the triad sequence information, it can be shown that the transesterification of the copolymer is controlled according to Bernoullian statistics.
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Matsuda et al. (2002) studied this question.
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