Copolymer of lactide and ε-caprolactone catalyzed by bimetallic Schiff base aluminum complexes  

作　　者：Jingwei Yang Zhiqiang Sun Ranlong Duan Lili Li Xuan Pang Xuesi Chen 

机构地区：[1]Department of Materials Science and Engineering, Jilin University [2]Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

出　　处：《Science China Chemistry》2016年第11期1384-1389,共6页中国科学（化学英文版）

摘　　要：A series of copolymers of lactide(LA) and e-caprolactone(ε-CL) with different monomer feed ratios were achieved using three kinds of bimetallic Schiff aluminum complexes as catalysts. The ratios of LA and ε-CL units in different copolymers and the average segments length were determined by NMR analysis. The comparative kinetic study of L-LA/ε-CL and rac-LA/ε-CL copolymerization systems showed that the polymerization rate of LA was faster than ε-CL, and L-LA showed polymerization rate slightly faster than rac-LA. It was inferred that the copolymers achieved by these complexes were gradient copolymers with gradual change in distribution of LA and e-CL 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 pro-portion change of two structural units.A series of copolymers of lactide（LA） and e-caprolactone（ε-CL） with different monomer feed ratios were achieved using three kinds of bimetallic Schiff aluminum complexes as catalysts. The ratios of LA and ε-CL units in different copolymers and the average segments length were determined by NMR analysis. The comparative kinetic study of L-LA/ε-CL and rac-LA/ε-CL copolymerization systems showed that the polymerization rate of LA was faster than ε-CL, and L-LA showed polymerization rate slightly faster than rac-LA. It was inferred that the copolymers achieved by these complexes were gradient copolymers with gradual change in distribution of LA and e-CL 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 pro-portion change of two structural units.

关 键 词：bimetallic catalyst lactide ε-caprolactone ring opening copolymerization 

分 类 号：O641.4[理学—物理化学] O631.5[理学—化学]