Co-polarized electret fibers tailored by in-situ microphase separation for high-performance oil mist filter

Abstract

Oily particulate matter has emerged as a critical environmental and occupational hazard, significantly posing risks to both worker health and industrial machinery. Although glass fiber nonwovens are widely used to tackle this issue, they usually show inadequate efficiency while filtering small oil mists limited by their micro-sized large fiber diameter and single mechanical filtering mechanism. Herein, electret nanofibrous membranes with co-polarized property are in situ synthesized via electrospinning, which derives from the precisely tailoring of dual-polymers microphase separation along with the charge injection. Benefitting from the enhanced co-polarized effect of two polymers with completely different polarization, the electret performance of composite membranes can increase by 238 % compared to single-polymer membranes. What's more, the resulting membranes exhibited a dense, porous structure, achieving an oil mist filtration efficiency of 98.77 % and an air resistance as low as 38.92 Pa. This new strategy offers a novel solution for the design and development of next-generation oil mist filtration materials.