Poly(vinylidene fluoride) (PVDF)‐based nanofibrous mats were produced via electrically assisted solution blowing (electroblowing). Morphology and filtration properties of the nanofibrous mats were investigated as a function of polymer concentration and applied voltage. The average fiber diameter was reduced from 727 ± 366 nm to 408 ± 143 nm and from 424 ± 233 nm to 328 ± 105 nm, using 16 wt% and 12 wt% concentrations, respectively, with an increase of electric voltage from 0 to 30 kV. In addition, the pore size of the mats produced from 12 wt% concentration decreases with the increase of electric voltage. Results showed that electroblown mats possess high filtration properties and performance. Enhancement of mechanical capturing efficiency is attributed to the reduction in fiber diameter and pore size. The enhancement of electrostatic capturing efficiency is thought to be from the improved electret property of the mats, which eliminates the need for a second step to polarize nanofibrous mats. As a result, both mechanical and electrostatic capture efficiency of the mats is enhanced compared to solution blown PVDF mats. The emerging electret property might be due to the accumulation of the electrostatic charges at high voltage and the enhanced polarized β phase, which is the result of the high drawing ratio applied to the polymer jet during the spinning process.

中文翻译：

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基于电吹PVDF的纳米纤维驻极体过滤器的结构和性能

聚偏二氟乙烯（PVDF）基纳米纤维垫是通过电辅助溶液吹制（电吹）生产的。研究了纳米纤维垫的形貌和过滤性能随聚合物浓度和施加电压的变化。分别使用16 wt％和12 wt％的浓度分别将平均纤维直径从727±366 nm减小到408±143 nm和从424±233 nm减小到328±105 nm，并且电压从0增加到30千伏。另外，由12重量％浓度产生的垫的孔径随着电压的增加而减小。结果表明，电吹毡具有很高的过滤性能和性能。机械捕获效率的提高归因于纤维直径和孔径的减小。静电捕获效率的提高被认为是由于垫的驻极体性能提高，从而消除了第二步极化纳米纤维垫的需要。结果，与溶液吹塑的PVDF垫相比，垫的机械和静电捕获效率均得到提高。出现的驻极体性能可能是由于高压下静电荷的积累和极化β相的增强所致，这是在纺丝过程中对聚合物射流施加高拉伸比的结果。