Processing Nomex Nanofibers by Ionic Solution Blow‑Spinning for Efficient High‑Temperature Exhausts Treatment  

作　　者：Zekun Cheng Haiyang Wang Ziwei Li Chong Yang Baopu Zhang Yiqian Zhou Yuxuan Wang Chao Jia Lei Li Hui Wu 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]National Engineering Research Center of Electric Vehicles,Beijing Institute of Technology,Beijing 100081,China [3]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China

出　　处：《Advanced Fiber Materials》2023年第2期497-513,共17页先进纤维材料（英文）

基　　金：support of the Basic Science Center Program of the National Natural Science Foundation of China(NSFC)under Grant no.51788104 and Beijing Natural Science Foundation under Grant no.JQ19005;China Postdoctoral Science Foundation Grant no.2021M691713.

摘　　要：Hard-to-dissolve polymers provide next-generation alternatives for high-performance filter materials owing to their intrin-sically 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 solu-tion 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 nanofi-brous membrane an even more ideal industrial-grade air filter than polypropylene,polytetrafluoroethylene,polyimide,and ceramic nanofibrous filters.

关 键 词：Nomex nanofibers Solution blow-spinning High-temperature filtration FLAME-RETARDANT 

分 类 号：TB383[一般工业技术—材料科学与工程] X701[环境科学与工程—环境工程]