Electrospun Polymer Composite Membrane with Superior Thermal Stability and Excellent Chemical Resistance for High-Efficiency PM2.5 Capture

To address the challenge of high-temperature air filtration, a novel electreted polysulfonamide/polyacrylonitrile-boehmite (PSA/PAN-B) composite nanofiber based filter was developed via electrospinning for effective high-temperature dust removal. In this study, the spinnability of PSA was greatly improved by adding a small amount of PAN as an auxiliary polymer, and the introduction of a boehmite electret further significantly reinforced the properties of PSA fibers. As a result, the PSA/PAN-B membrane exhibited a high filtration efficiency (up to 99.52 +/- 0.32%), low pressure drop (45.16 +/- 1.39 Pa), excellent flexibility, good mechanical properties, high thermal stability (up to approximately 300 degrees C), and superior chemical resistance. Through data analysis and 3D simulation, the important benefits of the boehmite electret in the optimization of the PSA fibrous membrane performance were determined: it increases the charge storage capacity, constructs a rough surface morphology, improves the specific surface area, and enhances the mechanical properties. More importantly, the PSA/PAN-B film possessed a robust PM2.5 purification capacity, and the particulate matter removal efficiency was kept unchanged after high-temperature, acid, or alkali treatment-a performance derived from the intrinsic molecular structure of PSA. The PSA/PAN-B composite fibrous membrane, with excellent comprehensive properties, is a promising candidate for air filters, especially in harsh environments, further broadening the applications of PSA and providing new insight into the design of high-performance filters with high-temperature and corrosion resistance.

为了解决高温空气过滤的挑战，通过静电纺丝技术开发了一种新型的驻极体聚磺酰胺/聚丙烯腈-勃姆石（PSA / PAN-B）复合纳米纤维基过滤器，以有效地去除高温灰尘。在这项研究中，通过添加少量的PAN作为辅助聚合物，大大提高了PSA的可纺性，而勃姆石驻极体的引入进一步显着增强了PSA纤维的性能。结果，PSA / PAN-B膜显示出高过滤效率（高达99.52 +/- 0.32％），低压降（45.16 +/- 1.39 Pa），出色的柔韧性，良好的机械性能和高的热稳定性（最高约300摄氏度），并具有出色的耐化学性。通过数据分析和3D模拟，确定了勃姆石驻极体在优化PSA纤维膜性能方面的重要优势：增加电荷存储容量，构造粗糙的表面形态，改善比表面积并增强机械性能。更重要的是，PSA / PAN-B膜具有强大的PM2.5净化能力，并且经过高温，酸或碱处理后，颗粒物去除效率保持不变-这种性能源自PSA的固有分子结构。 PSA / PAN-B复合纤维膜具有优异的综合性能，是空气过滤器（特别是在恶劣环境中）的有希望的候选者，这进一步扩大了PSA的应用范围，并为高温高性能过滤器的设计提供了新的见解和耐腐蚀性。

Published: 2019

Journal ：ACS APPLIED MATERIALS & INTERFACES

Impact Factor：9.002

Paper link: https://pubs.acs.org/doi/abs/10.1021/acsami.9b15219