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论文类型：期刊论文

发表时间：2008-10-01

发表刊物：POLYMER BULLETIN

收录刊物：SCIE、EI、Scopus

卷号：61

期号：4

页面范围：407-413

ISSN号：0170-0839

摘要：Poly(epsilon-caprolactone)-poly(L-lactide) (PCL-PLLA) block copolymers were synthesized via melt or solution sequential copolymerization of epsilon-caprolactone (epsilon-CL) and L-lactide (L-LA) using nontoxic dibutylmagnesium as initiator. The formation of block structure was confirmed by (1)H-, (13)C NMR, GPC, and FT-IR, it can be concluded that the block copolymers PCL-PLLA have been successfully synthesized by both melt and solution sequential copolymerization methods. Two melting endothermic peaks (T(m)) during heating and two crystallization exothermal peaks (T(c)) during cooling were observed in DSC curves. XRD patterns of the copolymers were approximately the superposition of both the PCL and PLLA homopolymers. The results indicated the coexistence of both PCL and PLLA crystalline microdomains, and the microphase separation took place in the block copolymers.