丙交酯(L-LA)与PEG600多嵌段共聚物的合成与表征

Synthesis and characterization of multi-block copolymer with L-LA and PEG600

以氧化锌为催化剂,使丙交酯开环与PEG600共聚,得到三嵌段的HO-PLLA-PEG-PLLA-OH预聚物,产物的数均相对分子量为2127。以TDI-80为扩链剂对其进行扩链,得到多嵌段共聚物。采用NMR、IR、GPC等对产物的结构、分子量分布进行了表征。

Triblock prepolymer HOPLLAPEGPLLAOH having the number average molecular weight 2127 was obtained by LLactide ringopening polymerization with PEG600 using ZnO as catalyst. The average Mn and Mw of multiblock copolymer could be increased to 8496, 31078 respectively by chainextending with \{TDI80\}. The chain structure and molecular weight distribution of multiblock copolymer was characterized by IR, NMR and GPC.