聚乳酸/芦苇纤维复合材料降解性能研究

Study on degradation properties of poly(lactic acid)/reed fiber composites

采用熔融共混法制备了不同比例的聚乳酸/芦苇纤维(PLA/RF)共混物,并通过吹塑制备了相对应的薄膜。研究了在蛋白酶K的作用下不同RF含量的PLA/RF薄膜的生物降解性能,同时用差示扫描量热法(DSC)和扫描电子显微镜(SEM)测定了样品降解过程中的结晶行为以及表面形貌变化。结果表明,RF对PLA的酶解降解有促进作用,随着RF含量的增加PLA/RF复合材料的酶解速率提升,其中含有30%(质量分数,下同)芦苇纤维的PLA/RF薄膜的降解速率最大,16天内可降解81.11%。研究还表明,加入芦苇纤维可以降低PLA的结晶度,从而影响降解速度。

Poly(lactic acid)(PLA)/reed fiber(RF)blends with different contents of RF were prepared through melt blending,and the corresponding films were prepared by blow molding.The biodegradability properties of PLA/RF blending films were investigated in the presence of proteinase K,and their crystallization behavior and surface morpholo⁃gical evolution during the degradation of the samples were also determined by using differential scanning calorimetry(DSC)and scanning electron microscopy(SEM).The results indicated that the enzymatic degradation of PLA was pro⁃moted by RF,and the enzymatic degradation rate of PLA/RF composites increased with an increase in the RF content.The degradation rate of composite films containing 30 wt%RF was the fastest,resulting in 81.11%degradation in 16 days.The addition of RF could reduce the crystallinity of PLA,affecting the degradation rate.