聚乳酸/茶多酚复合纳米纤维膜制备及力学性能研究

Preparation and mechanical performance of PLA/TP composite nanofiber films

采用静电纺丝技术,分别制备了聚乳酸(PLA)与茶多酚(TP)质量混比为100/0、90/10、80/20、70/30、60/40、50/50、40/60、30/70和20/80的复合纳米纤维膜。分别借助扫描电子显微镜(SEM)和KDⅡ-0.05微机控制电子万能试验机观察薄膜表面形貌及测试力学性能。SEM图分析结果表明:当PLA与TP的质量混比从100/0变化到50/50时,均能纺出较连续、光滑的纤维。随着纺丝液中PLA含量的减少,TP含量的增加,所纺纤维直径逐渐变小。超出这个范围,纤维断裂现象加剧,甚至出现纳米级颗粒团聚的现象。复合纳米纤维膜的拉伸强度逐渐减小,断裂伸长率先增加后减小。

Polylactic acid（PLA）/Tea polyphenol（TP） composite nanofilms were prepared using an electrospinning process. Various blends of PLA/TP solutions including 100/0,90/10,80/20,70/30,60/40,50/50,40/60,30/70, and 20/80 were formed. The morphology of the fibers was investigated by scanning electron microscope（SEM） and the mechanical property was tested using KD microcomputer control electronic universal test machine. The results of SEM indi- cated that the smooth continuous nanofibers were obtained when the blend ratio of PLA and TP varied from 100/0 to 50/ 50. It was found that the fiber diameter was decreased as increaseing the content of TP, however the fibers may become brittle and the nano paticles agglomerated were even appeared,when the blend ratio of PLA and TP exceeded this scope. The tensile strength was decreased and the elongation at break was increased firstly and then decreased.