静电纺聚乳酸纳米纤维微观结构的调控

Microstructure Control of Electrospun Polylactic Acid Nanofiber

利用溶剂相分离法制备了表面具有平行沟槽结构和多孔结构的聚乳酸纳米纤维,采取控制变量法分析了溶剂配比、溶液浓度、接收装置转速分别对聚乳酸纤维结构的影响。结果表明:聚乳酸纤维表面结构主要受到二元溶剂配比的影响,随着高挥发性溶剂占比的增加,纤维表面呈现光滑-沟槽-多孔结构的变化趋势;增加高速转辊转速可以调控纤维排列状态,在2200rpm的转速下可以获得高取向度的聚乳酸静电纺纳米纤维膜。

Polylactic Acid nanofiber(PLLA)with parallel groove structure and porous structure on the surface was prepared by solvent phase separation method.The effects of solvent ratio,solution concentration and receiver speed on the structure of PLLA nanofibers were analyzed by the control variable method.The results showed that the surface structure of PLLA fiber was mainly affected by the ratio of binary solvents.The fiber surface showed the change tendency of smooth-groove-porous structure with the increase proportion of highly volatile solvent.The fiber arrangement could be improved by increasing the rotating speed of the high-speed shaft,and a high orientation PLLA electrospun nanofiber membrane could be obtained at 2200rpm rotating speed.