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L,L-Lactide and ε-Caprolactone Block Copolymers by a ‘Poly(L,L-lactide) Block First’ Route

✍ Scribed by Marcin Florczak; Jan Libiszowski; Jaroslav Mosnacek; Andrzej Duda; Stanislaw Penczek

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
178 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

L,L‐lactide (LA) and ε‐caprolactone (CL) block copolymers have been prepared by initiating the poly(ε‐caprolactone) (PCL) block growth with living poly(L,L‐lactide) (PLA*). In the previous attempts to prepare block copolymers this way only random copolyesters were obtained because the PLA* + CL cross‐propagation rate was lower than that of the PLA–CL* + PLA transesterification. The present paper shows that application of Al‐alkoxide active centers that bear bulky diphenolate ligands results in efficient suppression of the transesterification. Thus, the corresponding well‐defined di‐ and triblock copolymers could be prepared.

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