Abstract
Reoplex® 346, a low number-average molecular weight (M̄n) poly 1,3-butylene adipate—frequently used as plasticizer in PVC-based cling-films—was studied by 1H and quantitative 13C NMR. It was found that Reoplex® results from the linear polyesterification of adipic acid (A) by an excess of butane 1,3-diol (B) with a (A/B) molar ratio of 0.88 giving a polyester having a number-average degree of polymerization (DPn) and an absolute M̄n of 15.7 and 1600g/mol, respectively. As primary alcohol function is more reactive than secondary alcohol, Reoplex® chain-ends are made up of 28.6% of primary alcohol and 71.4% of secondary alcohol.
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