文献类型：期刊文献

英文题名：Influence of Supercritical Carbon Dioxide-Assisted Polyamide Acid Modification of Aramid Fibers on the Properties of Aramid Fiber-Reinforced Styrene Butadiene Rubber

作者：Li, Yang Shi, Caiwen Pan, Xiaoli Yang, Le

第一作者：Li, Yang;李杨

通信作者：Yang, L[1];Yang, L[2]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[2]Guizhou Coll & Univ Proc Ind New Proc Engn Res Ctr, Guiyang 550003, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;corresponding author), Guizhou Coll & Univ Proc Ind New Proc Engn Res Ctr, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2024

卷号：25

期号：6

起止页码：2117-2130

外文期刊名：FIBERS AND POLYMERS

收录：;EI(收录号：20242116138790);Scopus(收录号：2-s2.0-85193799969);WOS:【SCI-EXPANDED(收录号:WOS:001229250600004)】；

基金：The authors gratefully acknowledge the National Natural Science Foundation of China (grant No. 52363009), Guizhou Institute of Technology high-level talent launch project, Guizhou Colleges and Universities Process Industry New Process Engineering Research Center (Qian Jiao Ji [2022] 034).

语种：英文

外文关键词：Aramid fiber; Polyamide acid; Supercritical carbon dioxide; Styrene butadiene rubber; Interfacial bonding

摘要：Modified aramid fibers (AFs) were prepared through grafting modification of polyamide acid (PAA) assisted by supercritical carbon dioxide (scCO2). The scCO2-assisted diffusion, penetration, and grafting reaction of PAA not only enhanced the graft rate but also produced a uniformly grafted layer on the modified fibers. After scCO2-assisted grafting with 5 wt% PAA, the grafted amount was 10.23%, the surface crystal spacing increased, and the crystallinity increased by 8.64%. Moreover, the tensile strength of the uniformly layered fibers increased by 9.66%. Next, short modified AF-reinforced carbon black/styrene butadiene rubber (SBR) was prepared with an AF/CB/SBR ratio of 2/50/100 parts per hundred rubber. As an acidic substance in the grafted coating layer, PAA was found to delay the vulcanization process and increase the positive vulcanization time. After modification with scCO2-assisted 5 wt% PAA, the -COOH groups in the grafted layer participated in the curing process of the curing agent. The rough and uniformly grafted layer enhanced the dispersibility of the modified fibers through the SBR matrix. The modification increased the tensile strength and modulus at 100% of the composites by 16.01 and 32.47% and accordingly improved the cutting resistance.