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Morphology and Melt Crystallization of PCL-PEG Diblock Copolymers

✍ Scribed by Ying Xu; Yong He; Jia Wei; Zhongyong Fan; Suming Li

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
442 KB
Volume
209
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

ROP of PCL was realized in the presence of mPEG with $\overline M _{\rm n}$ = 5 000, using Zn(La)~2~ as a catalyst. The resulting diblock copolymers with molar ratios of the CL/EO repeat units from 0.2–5.0 were characterized by DSC, WAXD, SEC, and ^1^H NMR. Melt crystallization was studied and analyzed with the Avrami equation. The spherulite growth rate G was determined at different crystallization temperatures. The G values were found to range between those of mPEG and PCL homopolymers. The morphology of an isothermally crystallized sample with CL/EO = 0.5 was examined. Spherulites with PCL embedded in PEG were observed, in contrast to concentric spherulites reported in the literature.

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