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以不同光学特性的丙交酯和己内酯为单体,辛酸亚锡为催化剂,对苯二甲醇(BDM)为引发剂,合成一系列不同PLA/PCL链段比的PLA-PCL-PLA三嵌段共聚物。采用1H-NMR、GPC、DSC对其大分子结构、分子量以及结晶熔融行为进行分析表征。同时,研究了不同PLA/PCL链段比和不同光学性质的PLA末端对嵌段共聚物力学性能的影响,结果表明:三嵌段共聚物的断裂伸长率超过1 000%,拉伸强度约为30 MPa,两端为无定型的PDLLA的嵌段共聚物的力学性能高于半结晶型的PLLA和PDLA的嵌段共聚物。
A series of PLA-PCL-PLA triblocks with different optical properties of lactide and caprolactone as monomers, stannous octoate as catalyst and terephthalyl alcohol (BDM) as initiator were synthesized. Section copolymer. The structure, molecular weight and melting behavior of the macromolecules were characterized by 1H-NMR, GPC and DSC. At the same time, the effect of different PLA / PCL segment ratio and different optical properties on the mechanical properties of the block copolymer was studied. The results showed that the triblock copolymer had an elongation at break of over 1 000% and a tensile strength of about The mechanical properties of PDLLA block copolymer with 30 MPa and PDLLA amorphous at both ends were higher than that of the PLLA and PDLA block copolymers with semi-crystalline type.