文献类型：期刊文献

中文题名：PPTA表面超临界CO_(2)处理时间对EP/PPTA界面粘结性能的影响

英文题名：Effects of Supercritical CO_(2) Treatment Time of PPTA Surface on Interfacial Adhesion Properties of EP/PPTA

作者：周琴 陈昌琴 高雪梅 徐梓俊 罗筑

第一作者：周琴

机构：[1]贵州理工学院工程训练中心,贵阳550003;[2]贵州理工学院材料与能源工程学院,贵阳550003;[3]贵州大学材料与冶金学院,贵阳550025

第一机构：贵州理工学院工程训练中心

年份：2021

卷号：49

期号：12

起止页码：96-102

中文期刊名：工程塑料应用

外文期刊名：Engineering Plastics Application

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：贵州省科技厅基金项目(黔科合基础[2019]1134号);贵州省教育厅科技拔尖人才支持计划项目(黔教合KY字[2018]059);贵州理工学院创新创业项目(x202014440057)。

语种：中文

中文关键词：对位芳纶纤维;超临界CO_(2);表面改性;环氧树脂;界面粘结性能;

外文关键词：para-aramid fiber;supercritical CO_(2);surface modification;epoxy resin;interfacial adhesion property

摘要：以傅里叶变换红外光谱、热重分析、扫描电子显微镜(SEM)、原子力显微镜、界面剪切强度(IFSS)测试和复合材料层间剪切强度(ILSS)测试等手段,研究了超临界CO_(2)处理时间对对位芳纶纤维(PPTA)表面结构和性能的影响,以及PPTA超临界CO_(2)理时间对环氧树脂(EP)/PPTA界面粘结性能的影响。研究表明,在相对较低的压强和温度(10 MPa,50℃)条件下,超临界处理30 min后,PPTA表层分子链间的氢键减弱,PPTA的热性能降低,PPTA表面出现"原纤化"的结构使表面粗糙度增加。与未处理PPTA原丝相比,经30 min超临界CO_(2)处理PPTA的单丝拉伸强度为22.6 cN/dtex,下降了5.0%。SEM分析和IFSS测试结果表明,PPTA表面的相对"疏松"结构和粗糙度的增加提升了PPTA与EP之间的界面粘结性能,经30 min超临界CO_(2)处理后,PPTA单丝与EP间的IFSS提升了9.7%,处理30,45 min后,制备的EP/PPTA复合材料试样的ILSS为65.2,68.3 MPa,与未处理PPTA原丝制备试样相比,分别增加了6.4%和11.4%。
The effects of supercritical CO_(2) treatment time on the surface structure and properties of para-aramid fiber(PPTA)were investigated by Fourier transform infrared spectroscopy,thermogravimetric analysis,scanning electron microscopy(SEM),atomic force microscopy,interfacial shear strength(IFSS)test and interlaminar shear strength(ILSS)test,as well as the effects of supercritical CO_(2) treatment time of PPTA on interfacial adhesion properties of epoxy resin(EP)/PPTA.The results show that at relatively low pressure and temperature(10 MPa,50℃),the hydrogen bonds between molecular chains on the surface of PPTA wea-ken after 30 min of supercritical treatment,the thermal properties decrease,and the"fibrillated"structure on the surface of PPTA increases the surface roughness.Compared with untreated PPTA,the tensile strength of PPTA monofilament treated with supercritical CO_(2) for 30 min is 22.6 cN/dtex,which decreases by 5.0%.SEM analysis and IFSS test results show that the relatively"loose"structure of PPTA surface and the roughness improve the interface bonding performance between PPTA and EP.After 30 min supercritical CO_(2) treatment,the interfacial shear strength between modified PPTA and EP increases by 9.7%.After 30 min and 45 min treatment,the interlaminar shear strength of the prepared EP/PPTA composite is 65.2 MPa and 68.3 MPa,which is 6.4%and 11.4%higher than that of the samples prepared without PPTA.