Molten Ring-Open Copolymerization of L-Lactide and Cyclic Trimethylene Carbonate

摘要

The biodegradable poly(L-lactide-co-trimethylene carbonate)[poly(LLA-co-TMC)] was synthesized by molten ring-open copolymerization and the structure and properties of the copolymer were investigated by GPC,NMR,FTIR,DSC,and Instron testing.The copolymer with a higher LLA content had a higher initial molecular weight (M_n),but a lower final M_n.In contrase,the copolymer with a higher TMC content had a lower initial M_n,but its M_n increased with increasing reaction time and TMC content.The glass transition temperature (T_g),the melting teperature (T_m) and the crystallinity of the copolymer decreased with increasing TMC content.The elongation of the copolymer significantly increased with increasing TMC content while the toughness passed through a maximum.