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Date of Publication:2009-01-01

Journal:功能材料

Affiliation of Author(s):化工学院

Volume:40

Issue:1

Page Number:123

ISSN No.:1001-9731

Abstract:Poly(DL-lactide-co-epsilon-caprolactone) copolymers were prepared by
   copolymerization of DL-LA and epsilon-CL using nontoxic magnesium
   octoate as catalyst in bulk.Microstructure analyses of the resulting
   copolymers were performed by means of 13CNMR spectroscopy.Two modes of
   transesterification occurred during the copolymerization process and
   played an important role in the redistribution of comonomer sequences
   toward randomness.The copolymer composition has a profound influence on
   the average block length of lactidyl and caproyl units(LeLL and
   LeC).Both LeLL and LeC increased as the relative proportions of their
   respective monomers increased.The thermal properties and crystallization
   of the copolymers were investigated by DSC and XRD.The results showed
   that a close relationship between copolymer crystallinity and the length
   of the copolymer sequences.All the copolymers exhibited a single Tg.The
   experimental Tgs were in agreement with the calculated values from Fox
   equation.It can be concluded that the copolymers are random,or comprise
   a mixture of compatible block copolymers.

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