针片辊式溶液微分电纺批量制备PVA纤维研究

Research on efficient preparation of PVA fiber by needle roller solution differential electrospinning

为实现批量制备性能优异的纤维膜,设计了一种针片辊式微分静电纺丝装置,以聚乙烯醇(PVA)静电纺丝为例,讨论了PVA溶液浓度和针片间距对纤维直径分布和纤维产能的影响。研究结果表明:随着PVA溶液浓度的增大(8%～11%,wt,质量分数),纤维平均直径越粗,直径分布范围也越大;针片间距主要影响针片尖端的电场强度分布,随着针片间距的增大,针片间电场强度分布更加均匀,当针片间距为10mm条件下,各个针片尖端的电场强度分布均匀性明显改善,制备的纤维膜直径分布范围较小,PVA溶液浓度为8%(wt,质量分数)条件下的纤维直径为(161±67)nm;纤维膜产量随PVA溶液浓度的增大逐渐升高,针片间距10mm,PVA溶液浓度为11%(wt,质量分数)条件下,获得最高的纺丝产能为12.8g/h。

In order to efficiently prepare high quality fiber membrane,a new type of needle roller differential electrospinning device was designed.The effect of spinning solution concentration and the needle piece spacing on fiber diameter distribution and fiber productivity were examined by taking PVA as a model polymer.The results showed that with the increase in the concentration of spinning solution（8 wt%～11 wt%）,the average diameter of fibers was larger and the range of diameter distribution was wider.The electric field intensity distribution at the tip of the needle piece was mainly affected by the spacing of needle piece.With the increase in the needle piece spacing,the uniformity of electric field intensity distribution at each tip of needle piece were obviously improved,and the range of fiber diameter distribution was narrower.When the needle piece spacing was 10 mm,spinning solution concentration was 8 wt%,the fiber diameter was（161±67）nm.The fiber productivity increased with the increase in the concentration of spinning solution.The maximum spinning efficiency was 12.8 g/h when the needle piece spacing was 10 mm and the spinning solution concentration was 11 wt%.