文献类型：期刊文献

英文题名：Supercritical carbon dioxide assisted impregnation and graft of polyamide acid into aramid fiber for formation of polar interface

作者：Li, Yang Xie, Gaoyi Li, Rong Wu, Yujie Chen, Changqin Luo, Zhu

第一作者：李杨;Li, Yang

通信作者：Luo, Z[1]

机构：[1]Guizhou Inst Technol, Sch Mat Sci & Energy Engn, Guiyang 550003, Peoples R China;[2]Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China;[3]Wuyi Univ, Sch Biotechnol & Hlth Sci, Jiangmen 529020, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Dept Polymer Mat & Engn, Guiyang 550025, Peoples R China.

年份：2022

卷号：21

起止页码：1-11

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：;EI(收录号：20225213311284);Scopus(收录号：2-s2.0-85144628904);WOS:【SCI-EXPANDED(收录号:WOS:000859354800001)】；

基金：This work was financially supported by PhD start-up fund of Guizhou Institute of Technology and Guizhou Province Science and Technology Planning Project ( (2019) 2845) .

语种：英文

外文关键词：Aramid fiber; Polyamide acid; Graft reaction; Supercritical carbon dioxide; Interfacial adhesion

摘要：Contrapose the high inertness of para-aramid fiber (AF) with high strength modulus, surface modification in a green and effective way is one of the main challenges currently faced by fiber reinforced composites engineers. In this study, AF was treated by a two-step process combining hot air treatment (250 ?, 1 h) and graft reaction of polyamide acid (PAA) assisted with supercritical carbon dioxide (scCO(2)). The ester group displayed on the fiber surface suggested the successful graft reaction between AF and PAA. Additionally, the auxiliary effect of scCO(2) increases the surface roughness, resulting in a more uniform grafted layer on the modified fiber surface. Specifically, in the process of graft modification of AF with 5% PAA assisted by scCO(2), the thickness of the grafted layer was about 100 nm. Meanwhile, a 50.15% increment of the interfacial shear strength indicated an obvious enhancements of surface adhesion. This study provides a feasible method for interfacial modification of AF, and further widens the application of scCO(2) as an auxiliary process in the surface modification of AF. (C) 2022 Published by Elsevier B.V.