Downy feather-like para-aramid fibers and nonwovens with enhanced absorbency,air filtration and thermal insulation performances  

作　　者：Kangli Xu Jixia Deng Guangliang Tian Lei Zhan Jiajia Ma Lijun Wang Qinfei Ke Chen Huang 

机构地区：[1]Engineering Research Center of Technical Textiles,Ministry of Education,College of Textiles,Donghua University,Shanghai 201620,China [2]Changshu Weicheng Nonwoven Equipment Co.,Ltd.,Suzhou215539,China

出　　处：《Nano Research》2022年第6期5695-5704,共10页纳米研究（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(No.CUSF-DH-D2020021).

摘　　要：Fiber morphology with off-standing branches,as found in nature,e.g.,in goose downy feather,provides exquisite functions that can be barely achieved by man-made fiber systems.In this work,we develop a simple and scalable method for generating downy feather-like para-aramid fibers and assemblies.Through treating commercial para-aramid microfibers with mild alkaline solution(low concentration of NaOH),a synergistic effect of chemical hydrolysis and physical shearing is successfully triggered to generate abundant nanofiber branches on the surface of para-aramid fibers.When compared with conventional monotonous structures,nonwovens composed of downy feather-like fibers exhibit a typical multiscale fiber morphology,larger specific surface area and smaller pore size,thus showing enhanced particles adsorption capacity(over twice of the pristine nonwoven),excellent oil absorption capacity(increased by~50%),improved air filtration performances(doubled the filtration efficiency)and effective thermal insulation(thermal conductivity=26.1 mW·m^(−1)·K^(−1)).More attractively,the intrinsic flame-retardant nature of para-aramid is well inherited by the downy feather-like fibers,and the fabrication process requires neither sophisticated equipment,nor tedious procedures,making us believe the strong competitiveness of these fibers and assemblies.

关 键 词：downy feather-like fibers NANOFIBRILS para-aramid nonwoven surface fibrillation oil absorption air filtration 

分 类 号：TB3[一般工业技术—材料科学与工程]