聚L-乳酸/二氧化硅纳米复合材料的降解性能研究

Studies on degradability of poly(L-lactide)/surface-grafting silica nanocomposites

为了研究乳酸齐聚物接枝改性SiO2(g-SiO2)对聚乳酸降解行为的影响,采用熔融共混法制备得到了聚乳酸/g-SiO2纳米复合材料。重点研究了PLLA/g-SiO2纳米复合材料和PLLA在PBS缓冲溶液中的降解行为,通过其表观形貌观察、吸水率、失重率研究发现g-SiO2能够加速PLLA的降解,并且随着g-SiO2含量的增加,其降解速率明显加快。降解过程的DSC测试显示PLLA/g-SiO2纳米复合材料的Tg随着降解时间的延长而逐渐减小。

In order to investigate effection of the silica nanoparticles surface-grafted with L-lactic acid oligomer（g-SiO2）to degradability of poly（L-lactide）（PLLA）.PLLA/g-SiO2 nanocomposites were prepared by melt blending.Degradation behavior of PLLA/g-SiO2 nanocomposites and PLLA in PBS buffer solution was investigated by the apparent morphology,water absorption,weight loss,the result showed that g-SiO2 can increase degradation rate of PLLA,and degradation rate of PLLA had accelerated noticeably with increasing content of g-SiO2.DSC analysis showed that Tg of PLLA/g-SiO2 composites decreased with prolongation of degradation time.