溶解体系对聚醚砜纤维膜过滤分离性能的影响

Effect of Dissolution System on Filtration and Separation Property of Polyethersulfone Fiber Membrane

研究静电纺丝液中不同质量比的N-甲基吡咯烷酮(NMP)与N,N-二甲基甲酰胺(DMF)对聚醚砜纤维性能的影响。构建了NMP/DMF质量比分别为0∶4,1∶3,2∶2,3∶1,4∶0的溶解体系,测试了纺成聚醚砜纤维的成形、聚集态结构、力学性能、过滤性能及油水分离性能。结果表明:纯NMP、DMF为纺丝溶解体系时,静电纺丝获得的纤维直径在(1.66±1.28)μm、(0.89±0.53)μm;随着纺丝溶解体系中NMP含量的增加,纤维网中纤维之间出现黏连且纤维直径增加,纤维膜的断裂应力逐渐增大而应变呈现出先增加后减小的趋势,纤维膜内聚醚砜聚集态结构未变化;NMP∶DMF为3∶1时制备的(13.32±1.42)g/m^(2)的聚醚砜纤维膜表现出较高的压降(102 Pa);各纤维膜均具有良好的油水分离性能。认为:NMP∶DMF为3∶1时制备的聚醚砜纤维膜对0.225μm~10.000μm的NaCl气溶胶微粒具有十分优异的过滤效果。

Effects of different mass ratios of N-methylpyrrolidone(NMP)and N,N-dimethylformamide(DMF)in electrospinning solution on property of polyethersulfone fiber were studied.The dissolving systems were constructed by mass ratio of NMP/DMF 0∶4,1∶3,2∶2,3∶1 and 4∶0 respectively.The related properties of the spun polyethersulfone fiber were tested including fiber formation,aggregation structure,mechanical property,filtration property and oil-water separation property.The results showed that the fiber diameters obtained by electrospinning were(1.66±1.28)μm and(0.89±0.53)μm,when pure NMP and DMF were used as spinning solution.With the increase of NMP content in the spinning solution,electrospinning fibers in webs were bonded and the fiber diameters were increased.The stress of the fiber membrane was gradually increased,but the strain was showed a trend of first increasing and then decreasing.The polyethersulfone aggregation structure in the fiber membrane was not changed.When NMP∶DMF was 3∶1,the polyethersulfone fiber membrane with(13.32±1.42)g/m^(2)showed a high pressure drop(102 Pa).Each fiber membrane had better oil-water separation property.It is considered that the polyethersulfone fiber membrane prepared by dissolving solution(NMP∶DMF=3∶1)has excellent filtration effect for 0.225μm~10.000μm NaCl aerosol particles.