高分子质量聚(L-丙交酯-co-己内酯)无规共聚物的制备及性能

Preparation and Properties of Poly(L-Lactide-co-Caprolactone)Random Copolymer with High Molecular Weight

以L-乳酸和ε-己内酯为原料,采用L-丙交酯与ε-己内酯在辛酸亚锡(Sn(oct)2)催化下开环共聚,制备了高分子质量的3种不同的聚(L-丙交酯-co-己内酯)(P(LLA-CL))无规共聚物,即P(LLA-CL)85/15、P(LLA-CL)75/25和P(LLACL)65/35无规共聚物;并用红外光谱和核磁共振对其结构进行了确认。采用纤维取向模压成型,对3种P(LLA-CL)材料中己内酯含量与材料性能之间的关系进行了研究。研究发现,P(LLA-CL)85/15、P(LLA-CL)75/25和P(LLA-CL)65/35都是部分结晶的,它们的力学强度、结晶度、玻璃化转变温度和熔融温度随着己内酯含量的增加而降低,并发现3种P(LLA-CL)原材料经加工后,结晶度都有所降低。

Three kinds of poly(L-lactide-co-caprolactone)[i.e.P(LLA-CL)]random copolymer with high molecular weight,i.e.P(LLA-CL)85/15 random copolymer,P(LLA-CL)75/25 random copolymer,and P(LLA-CL)65/35 random copolymer,were prepared by ring-opening polymerizing from the L-lactide andε-caprolactone(ε-CL),and Sn(oct)2was used as catalyst.The constructure of three copolymers were confirmed by FT-IR and 1H-NMR.The results indicate that three kinds of P(LLA-CL)materials are partially crystalline and their mechanical strength,crystallinity,glass transition temperature and melting temperature descend with increase of the CL component.And the crystallinity of raw materials is larger than that of processed materials.