静电纺聚乳酸纳米纤维复合滤料的过滤性能研究

将聚乳酸颗粒加入到质量比为8:2的三氯甲烷与N-N-二甲基甲酰胺的混合溶剂中,室温下配置质量分数为10%的纺丝液,采用静电纺丝法制备了平均直径在620nm左右的聚乳酸纤维。以聚乳酸熔喷非织造布为基布,通过控制纺丝时间的不同得到了负载不同厚度纳米纤维层的可生物降解的复合过滤材料。通过对各试样的孔隙率、孔径及孔径分布、过滤效率的测试发现:随着纺丝时间的增加,复合材料孔隙率不断下降,孔径不断减小,纺丝3h时,孔径基本减小到原先的一半,且分布相对集中,大大地提高了普通过滤材料的过滤效率。

Filtration properties of electrospun PLA nano-fiber composite membrane

Spinning solution of 10wt% PLA was prepared by dissolving the particles of polyactic acid in 8:2(w/w) mixed solvent of trichloromethane and N,N-dimethylformamide at room temperature.The spinning solution was electrospun into polyactic acid nanofibers which had the average diameter of 620 nm.PLA melt-blown nonwoven fabrics were used as collecting substrates during the electrospinning.The excellent biodegradable composite filtering materials with different thickness of the electrospun PLA nanofiber layers were made through controlling different electrospinning time.The porosity,pore diameter,pore size distribution and filtration efficiency of the composite were tested.The experimental results indicated that the porosity and pore diameter of the composite were reduced with the increase of electrospinning time.When the spinning time increased to 3 hours,the pore diameter was decreased to the half of the original and the pore size distribution was more centralized.The filtration efficiency was greatly enhanced.