New well-defined macrodiols were prepared by ring-opening copolymerization of lactones and cyclic diesters with a low molecular weight diol. Suitable monomers are diglycolide, L,L-dilactide, ε-caprolactone, and rac-β-butyrolactone. With exception of rac-β-butyrolactone, the reaction can be performed with or without a catalyst. The use of a catalyst influences the sequence structure of the telechelics. Copolyesterdiols from ε-caprolactone, diglycolide, and ethylene glycol with random, blocky, and intermediate structure were synthesized and characterized. The analogous copolyesterdiols from L,L-dilactide, ε-caprolactone, and ethylene glycol were also prepared. The sequence structure of the random chains with diglycolide corresponds to a random distribution of glycolate units, that of the corresponding chains with L,L-dilactide exhibit a random distribution of L,L-dilactate units.
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Lendlein et al. (2000) studied this question.