Preparation of High Molecular Weight Poly（L-lactide-co-caprolactone）（75/25）  

作　　者：Xiongjun Shen Xiaofeng Chen Xian Li 

机构地区：[1]School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China [2]School of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China

出　　处：《Journal of Chemistry and Chemical Engineering》2014年第5期470-475,共6页化学与化工（英文版）

摘　　要：P（LLA-CL）（75/25） （poly（L-lactide-co-caprolactone）（75/25）） was synthesized from high purity L-lactide and e-caprolactone using tin octoate as initiator by ring-opening polymerization, and characterized by infrared spectrum and ^1-NMR （^1H proton spectrum of nuclear magnetic resonance） spectrum. The synthesized P（LLA-CL）（75/25） is a random copolymer. The influences of polymerization temperature, polymerization time and dosage of initiator on the weight average molecular weight and the polydispersity index of P（LLA-CL）（75/25） were investigated. The optimum preparation condition of P（LLA-CL）（75/25） was： the polymerization pressure is less than 0.5 Pa, the polymerization temperature is 125℃, the n（M）/n（I） ratio is 8,000/1, the polymerization time is 36 h. Under the condition, the weight-average molecular weight of prepared P（LLA-CL）（75/25） is 45.3×10^4, and molecular weight distribution coefficient is 1.24.

关 键 词：Poly（L-lactide-co-caprolactone）（75/25） COPOLYMERIZATION high molecular weight characterization. 

分 类 号：TQ253[化学工程—有机化工] TQ323.4