Electret nanofibrous membrane with enhanced filtration performance and wearing comfortability for face mask

Airborne particulate matter (PM) pollution has become a serious threat to human health, thus it is highly desired for a high-filtration-performance and good-wearing-comfort face mask. Herein, a highly breathable and thermal comfort filter medium consisting of electret polyethersulfone/barium titanate nanofibrous membrane (PES/BaTiO3 NFM) integrated on a nonwoven polypropylene substrate was developed. Benefiting from the high porosity and optimized injection charge energy, the PES/BaTiO3 membrane was endowed with a good air permeability of 743 mm s(-1), a modest water vapor permeability of 6.24 kg m(-2) d(-1), and an enhanced charge storage stability. In addition, the electret PES/BaTiO3 NFM1.5 medium with a low basis weight of 4.32 g m(-2) still shows a high filtration efficiency of 99.99% and a low pressure drop of 67 Pa after being treated at 200 degrees C for 45 min, which is better than that of commercial media. Moreover, 3D simulation based on the characters of composite membrane was processed to graphically express the airflow distribution during the filtration process. Significantly, the NFM1.5 with a high infrared (IR) transmittance of 93.4% led to an effective radiative cooling to human body radiation. This multifunctional fibrous medium design may provide new insights into the development of environmental adaptive protection materials.

空气中的颗粒物（PM）污染已严重威胁人类健康，因此非常需要高过滤性能和佩戴舒适的口罩。在此，开发了由驻极体聚醚砜/钛酸钡纳米纤维膜（PES / BaTiO3 NFM）集成在非织造聚丙烯基材上构成的高度透气和热舒适的过滤介质。得益于高孔隙率和优化的注入电荷能量，PES / BaTiO3膜具有743 mm s（-1）的良好透气性，6.24 kg m（-2）d（-1）的适度水蒸气透过性以及增强的电荷存储稳定性。此外，低基重为4.32 gm（-2）的驻极体PES / BaTiO3 NFM1.5介质在200℃下处理45分钟后仍显示99.99％的高过滤效率和67 Pa的低压降。分钟，比商业媒体要好。此外，根据复合膜的特性进行了3D模拟，以图形方式表示了过滤过程中的气流分布。值得注意的是，具有93.4％的高红外（IR）透射率的NFM1.5导致对人体辐射的有效辐射冷却。这种多功能的纤维介质设计可以为开发环境适应性保护材料提供新的见解。

Published: 2018

Journal ：JOURNAL OF COLLOID AND INTERFACE SCIENCE

Impact Factor：7.837

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S002197971830777X