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Title of Journal: Sci China Chem

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Abbravation: Science China Chemistry

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Science China Press

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1869-1870

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Copolymer of lactide and εcaprolactone catalyzed

Authors: Jingwei Yang Zhiqiang Sun Ranlong Duan Lili Li Xuan Pang Xuesi Chen
Publish Date: 2016/10/24
Volume: 59, Issue: 11, Pages: 1384-1389
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Abstract

A series of copolymers of lactide LA and εcaprolactone εCL with different monomer feed ratios were achieved using three kinds of bimetallic Schiff aluminum complexes as catalysts The ratios of LA and εCL units in different copolymers and the average segments length were determined by NMR analysis The comparative kinetic study of LLA/εCL and racLA/εCL copolymerization systems showed that the polymerization rate of LA was faster than εCL and LLA showed polymerization rate slightly faster than racLA It was inferred that the copolymers achieved by these complexes were gradient copolymers with gradual change in distribution of LA and εCL units The thermal properties of these copolymers were characterized by DSC analysis which showed that the glass transition temperature Tg of these copolymers changed regularly according to the proportion change of two structural units

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