Processing Nomex Nanofibers by Ionic Solution Blow-Spinning for Efficient High-Temperature Exhausts Treatment,Advanced Fiber Materials

当前位置： X-MOL 学术 › Adv. Fiber Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Processing Nomex Nanofibers by Ionic Solution Blow-Spinning for Efficient High-Temperature Exhausts Treatment
Advanced Fiber Materials ( IF 17.2 ) Pub Date : 2022-12-08 , DOI: 10.1007/s42765-022-00231-x
Zekun Cheng ₁ , Haiyang Wang ₁ , Ziwei Li ₁ , Chong Yang ₁ , Baopu Zhang ₁ , Yiqian Zhou ₁ , Yuxuan Wang ₁ , Chao Jia ₂ , Lei Li ₃ , Hui Wu ₁

Affiliation

Hard-to-dissolve polymers provide next-generation alternatives for high-performance filter materials owing to their intrinsically high chemical stability, superior mechanical performance, and excellent high-temperature resistance. However, the mass production of hard-to-dissolve nanofibers still remains a critical challenge. A simple, scalable, and low-cost ionic solution blow-spinning method has herein been provided for the large-scale preparation of hard-to-dissolve Nomex polymeric nanofibers with an average diameter of nearly 100 nm. After rapidly dissolving Nomex microfibers in the lithium chloride/dimethylacetamide (LiCl/DMAc) solution system, the conductive solution can be stably and conductivity-independently processed into nanofibers. The method optimizes electrospinning and avoids spinnability degradation and potential safety hazards caused by high electrical conductivity. Owing to nanofibrous structure and high dipole moment, Nomex nanofibrous filters show a stable high filtration efficiency of 99.92% for PM_0.3 with a low areal density of 4.6 g m⁻², as well as a low-pressure drop of 189.47 Pa. Moreover, the flame-retardant filter can work at 250 °C and 280 °C for a long and short time without shrinking or burning, respectively, exhibiting a high filtration efficiency of 99.50% for PM_0.3−10.0. The outstanding properties and low cost enable the efficient capture of PM from various high-temperature exhausts, making Nomex nanofibrous membrane an even more ideal industrial-grade air filter than polypropylene, polytetrafluoroethylene, polyimide, and ceramic nanofibrous filters.

Graphical abstract

Hard-to-dissolve nanofibers provide alternatives for high-efficiency and low-resistant air filtration but are limited by the universality and economics of fabrication methods. A scalable and efficient ionic solution blow-spinning strategy has herein been proposed in preparing hard-to-dissolve nanofibrous filters.

中文翻译：

通过离子溶液吹纺加工 Nomex 纳米纤维，用于高效的高温废气处理

难溶聚合物由于其固有的高化学稳定性、卓越的机械性能和出色的耐高温性，为高性能过滤材料提供了下一代替代品。然而，难以溶解的纳米纤维的大规模生产仍然是一个严峻的挑战。本文提供了一种简单、可扩展且低成本的离子溶液吹纺方法，用于大规模制备平均直径接近 100 nm 的难溶解 Nomex 聚合物纳米纤维。将 Nomex 微纤维快速溶解在氯化锂/二甲基乙酰胺 (LiCl/DMAc) 溶液体系中后，导电溶液可以稳定地加工成与导电性无关的纳米纤维。该方法优化了静电纺丝，避免了高导电性导致的可纺性下降和安全隐患。由于纳米纤维结构和高偶极矩，Nomex 纳米纤维过滤器对 PM 表现出 99.92% 的稳定高过滤效率_0.3，低面密度4.6 g m ⁻²，低压降189.47 Pa。此外，该阻燃滤芯可在250℃和280℃下长期和短时间工作而不收缩或分别燃烧，对 PM _0.3−10.0表现出 99.50% 的高过滤效率。出色的性能和低成本使得能够从各种高温废气中高效捕获 PM，使 Nomex 纳米纤维膜成为比聚丙烯、聚四氟乙烯、聚酰亚胺和陶瓷纳米纤维过滤器更理想的工业级空气过滤器。