Preparation of a polyurethane electret nanofiber membrane and its air-filtration performance

Pollution by atmospheric particulate matter (PM) is a serious threat to human health, and traditional window screens are unable to intercept fine particles. Therefore, it is urgent to develop anti-haze window screens to effectively protect the public. We prepared a polyurethane/silicon nitride (PU/Si3N4) electret nanofiber membrane with a minimum diameter (350 nm) and narrower diameter distribution than those of PU-Boehmite, PU-SiO2, and PU-TiO2 membranes by electrospinning. The PU-Si3N4 fiber membrane has good mechanical properties with stress of 18.05 MPa and strain of 170%. Moreover, PU/Si3N4 exhibits a maximum current peak (2.63 pA) at 90 degrees C. Importantly, PU/Si3N4 membranes applied to window screens still maintain high filtration efficiency (79.36%) and low resistance (25 Pa) to air flow at a low areal density of 1.22 g/m(2). Furthermore, they show good light transmittance (40%) and air permeability (46.42 mm s(-1)). Therefore, PU/Si3N4 electret nanofiber window screens have broad application prospects. (C) 2019 Elsevier Inc. All rights reserved.

大气颗粒物（PM）污染严重威胁着人类健康，传统的玻璃窗无法拦截细小颗粒。因此，迫切需要开发防雾窗纱窗以有效保护公众。我们通过静电纺丝制备了最小直径（350 nm）且直径分布比PU-勃姆石，PU-SiO2和PU-TiO2膜更小的聚氨酯/氮化硅（PU / Si3N4）驻极体纳米纤维膜。 PU-Si3N4纤维膜具有良好的机械性能，应力为18.05 MPa，应变为170％。此外，PU / Si3N4在90摄氏度时表现出最大电流峰值（2.63 pA）。重要的是，应用于玻璃窗的PU / Si3N4膜在室温下仍保持高过滤效率（79.36％）和低阻力（25 Pa）。低的面密度1.22 g / m（2）。此外，它们显示出良好的透光率（40％）和透气性（46.42 mm s（-1））。因此，PU / Si3N4驻极体纳米纤维窗纱具有广阔的应用前景。 （C）2019 Elsevier Inc.保留所有权利。

Published: 2019

Journal ：JOURNAL OF COLLOID AND INTERFACE SCIENCE

Impact Factor：7.837

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S0021979719310082