文献类型：期刊文献

中文题名：芳纶纤维热处理对聚酰亚胺/芳纶纤维复合薄膜性能的影响

英文题名：The Effect of Fiber Heat Treatment on Properties of Polyimide/Aramid Fiber Composite Films

作者：李杨 肖臻 史才雯 潘小丽 王姿懿 刘伟

第一作者：李杨

机构：[1]贵州理工学院材料与能源工程学院,贵阳550003;[2]通标标准技术服务(青岛)有限公司,山东青岛266000

第一机构：贵州理工学院材料与能源工程学院

年份：2023

卷号：51

期号：12

起止页码：112-117

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:【CSCD2023_2024】；

基金：国家自然科学基金项目(52363009);黔科合基础-ZK[2022]一般179。

语种：中文

中文关键词：芳纶纤维;热处理;聚酰亚胺;聚集态结构;力学性能

外文关键词：aramid fiber;heat treatment;polyimide;aggregate structure;mechanical property

摘要：通过高温热处理芳纶纤维的方式提升芳纶纤维的表面极性以改善芳纶纤维与聚酰亚胺的界面相容性,进一步制备出聚酰亚胺(PI)/芳纶纤维(AF)薄膜。以傅里叶变换红外光谱(FTIR)仪和拉曼光谱研究了热处理前后芳纶纤维表面基团的变化,并以FTIR、X射线衍射、扫描电子显微镜和偏光显微镜研究了PI/AF复合薄膜热处理前后的酰亚胺化程度和结晶情况。研究表明,热处理后芳纶纤维表层分子链段中苯环出现了部分氧化,而拉曼光谱面扫描也进一步证实了热处理后纤维表面部分区域分子链C—H的氧化现象,纤维表面极性增强的同时表层分子链能够重排使得氢键重构并有所增强。热处理后PI/AF复合薄膜酰亚胺化程度为92.1%,相对于纯PI膜提升了13.4%;芳纶纤维通过诱导结晶作用提升了PI的结晶度和复合薄膜的酰亚胺化程度,进而提升了与PI的界面相容性;PI/AF复合薄膜拉伸强度和拉伸弹性模量分别为70.24 MPa和584 MPa,比热处理前分别提升了5.7%和12.9%。
The surface polarity of aramid fiber was increased by heat treatment at high temperature,and the interface compatibility between aramid fiber and polyimide was improved,then polyimide(PI)/aramid fiber(AF)films was prepared by modified aramid fiber.The changes of groups on the surface of aramid fiber before and after heat treatment were studied by fourier transform infrared(FTIR)spectrometer and Raman surface scanning.The degree of imide and crystallization of PI/AF composite films after heat treatment were studied by FTIR spectroscopy,X-ray diffraction,scanning electron microscopy and polarizing microscope.The results show that partial oxidation of benzene ring in the surface molecular chain segment of aramid fiber occurs after heat treatment,and Raman surface scanning verified the oxidation of molecular chains in some areas on the surface of the fiber after heat treatment.While the polarity of the fiber was enhanced,the surface molecular chains can be rearranged to restructure and strengthen the hydrogen bond.The imide degree of PI/AF composite film is 92.1%,which is 13.4%higher than that of pure PI film.After heat treatment,the aramid fiber improves the crystallinity of PI and the degree of imide of composite film by inducing crystallization,then improves the interfacial compatibility with PI.The tensile strength and elastic modulus of PI/AF composite film are 70.24 MPa and 584 MPa,respectively,which are increased by 5.7%and 12.9%compared with that before heat treatment.