Effects of surface morphology of electrospun polystyrene fiber on its air filtration performance

A series of membranes, made from polystyrene microfibers and with different morphologies, were fabricated via electrospinning method in this study. In addition, not only porous fibers but also beaded fibers were obtained by adjusting the experimental temperature in a reasonable and appropriate way. Assisted by a high-speed camera, the images of jet behaviors at different experimental temperatures were captured for the purpose of in-depth and comprehensive understanding of formation mechanism of different fiber morphologies. Mono-disperse sodium chloride aerosol particles with different sizes and cigarette smoke were used, for the attainment of the objective of evaluation on the filtration performance of fabricated membranes. The experimental results showed that straight fiber with narrow pores on its surface can be obtained at 20 degrees C spinning temperature because of the rapid jet motion and solvent evaporation, and also, beaded fibers can be fabricated in the situation of spinning temperature higher than 25 degrees C due to the sudden change of surface tension resulted from the fast solvent evaporation. The porous straight fibers exhibited excellent filtration performance to cigarette smoke and aerosol containing particles of all sizes (99.76%, 99.92%, and 99.99% filtration efficiency for particles with sizes of 0.3 mu m, 0.5 mu m, and 1 mu m, respectively).

本研究通过静电纺丝法制备了一系列由聚苯乙烯微纤维制成的，具有不同形态的膜。另外，通过以合理和适当的方式调节实验温度，不仅获得了多孔纤维，而且获得了串珠纤维。借助高速相机，可以捕获不同实验温度下的射流行为图像，以深入，全面地了解不同纤维形态的形成机理。为了达到评价所制备的膜的过滤性能的目的，使用了具有不同尺寸和香烟烟雾的单分散氯化钠气雾剂颗粒。实验结果表明，由于快速的喷射运动和溶剂蒸发，在20℃的纺丝温度下可获得表面细孔较窄的直纤维，在纺丝温度高于25℃的情况下也可制成串珠纤维。 C是由于溶剂快速蒸发而引起的表面张力的突然变化。多孔直纤维对各种尺寸的香烟烟雾和气雾剂均表现出优异的过滤性能（对于尺寸分别为0.3μm，0.5μm和1μm的颗粒，过滤效率为99.76％，99.92％和99.99％） 。

Published: 2020

Journal ：Journal of Industrial Textiles

Impact Factor：2.455

Paper link: https://journals.sagepub.com/doi/abs/10.1177/1528083720909462