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Polyether-polyester block copolymers by non-catalysed polymerization of ɛ-caprolactone with poly(ethylene glycol)

✍ Scribed by Piero Cerrai; Mario Tricoli; Fulvio Andruzzi; Maurizio Paci; Massimo Paci

Book ID
107846158
Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
553 KB
Volume
30
Category
Article
ISSN
0032-3861

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## Abstract Biodegradable copolymers were prepared by ring‐opening polymerization of sequentially added __ε__‐caprolactone and DL‐lactide in the presence of ethylene glycol or poly(ethylene glycol), using zinc metal as catalyst. Polymerization was performed in bulk and yielded block copolymers with

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## SYNOPSIS Blends of poly(L-lactide) (PLLA) and poly(e-caprolactone) (PCL) were prepared in a corotating twin screw miniextruder (40 rpm, 200"). It was attempted to prepare multiblock copolymers by allowing a controlled number of transesterification reactions. Various catalysts (n-Bu,SnOMe, Sn(Oc