聚(ε-己内酯-L-丙交酯)无规共聚物与聚乳酸共混材料的制备与性能

Preparation and Properties of Blends from Poly( ε-caprolactone-ran-L-lactide) Random Copolymer and Amorphous Poly (lactic acid)

通过开环聚合,合成不同比例的ε-己内酯(ε-CL)与L-丙交酯(L-LA)的无规共聚物P(CL/LLA)。将上述共聚物P(CL/LLA)与聚乳酸(PLLA)共混,制备了PLA/P(CL/LLA)共混材料。并对其相容性、热性能、力学性能进行了研究。结果表明,共聚物P(CL/LLA)与PLA相容性与共聚物中LA单元含量和链段的平均长度有密切关系,P(CL/LLA)中LA链段平均长度达到3.4以上时,可以与PLA很好的相互作用。同时共聚物P(CL/LLA)中—CL—链段有很好的柔性,可以很好的改善PLLA的韧性,使PLLA材料的断裂伸长率达到500%以上。

Different proportions of PCL / PLLA random copolymers made from ε-caprolactone（ ε-CL） and Llactide（ L-LA） were synthesized by ring-opening polymerization. Copolymers were added to PLA by melt blending to afford PLA / P（ CL / LLA） blends. The compatibility,thermal and mechanical properties of the blends were studied. The results show that the compatibility of PLA and P（ CL / LLA） is closely related to the average length of the lactide unit in copolymer. When the number-average length of lactide in P（ CL / LLA） is longer than 3. 4,the copolymer can interact with PLA very well. Caprolactone sequences can provide flexible units for the copolymer,and improve the toughness for the blends. The elongation at break of the blends can reach as high as 500%.