This paper gives a short review of our findings related to the copolymerization of γ‐butyrolactone (B) and L,L‐lactide (L) with ϵ‐caprolactone (C) at or below B and L equilibrium concentrations in homopolymerization. We show, contrary to the commonly established opinions, that: (i) B effectively undergoes ring‐opening reaction and therefore is able to high molar copolymers formation containing up to 50 mol‐% repeating units derived from B and (ii) in conditions eliminating transesterification living poly(L) does initiate polymerization of C leading to poly(L)‐block‐poly(C) copolymer.
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Duda et al. (2005) studied this question.