碳纤维/环氧树脂界面的强韧化设计方法研究  

Strengthening-toughening design method of carbon fiber/epoxy resin interface

作　　者：王沁宇 卓家桂 李新顶 杜鹏程 王文 朱大雷 谈建平[4] WANG Qinyu;ZHUO Jiagui;LI Xinding;DU Pengcheng;WANG Wen;ZHU Dalei;TAN Jianping(Fujian Fuqing Nuclear Power Co.,Ltd.,Fujian 350318,China;Shanghai Yihe Valve Co.,Ltd.,Shanghai 201823,China;Beijing Satellite Manufacturing Co.,Ltd.,Beijing 100094,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]福建福清核电有限公司,福建350318 [2]上海一核阀门股份有限公司,上海201823 [3]北京卫星制造厂有限公司,北京100094 [4]华东理工大学机械与动力工程学院,上海200237

出　　处：《复合材料科学与工程》2023年第8期14-18,84,共6页Composites Science and Engineering

基　　金：国家自然科学基金(52075174)。

摘　　要：为了同时提升碳纤维/环氧树脂复合后的界面强度和韧性,设计了新型“刚-柔”界面层。该方法采用超声分散将刚性的多壁碳纳米管(MWCNT)与柔性的热塑性聚氨酯(TPU)在N,N-二甲基甲酰胺溶液中均匀分散,随后采用浸涂法将MWCNT与TPU同时沉积在碳纤维表面对其进行改性。采用扫描电子显微镜、原子力显微镜、红外光谱和拉曼光谱对改性后碳纤维表面进行表征,并采用纤维束拔出实验测试了碳纤维/环氧树脂的界面剪切强度和拔出位移。结果表明:利用上述碳纤维/环氧树脂界面的强韧化设计方法可将MWCNT和TPU均匀沉积在碳纤维表面;与对照组相比,由于该方法实现了化学的氢键作用和物理的机械连锁作用的协同,改性后的碳纤维/环氧树脂界面剪切强度提升了163.3%,拔出位移提升了52.8%,表明本文所设计的“刚-柔”界面层对提升碳纤维/环氧树脂界面的强度和韧性有积极作用。To improve the interfacial strength and toughness of carbon fiber/epoxy resin composites simultane⁃ously,a novel“rigid-soft”interface layer was constructed via dispersing rigid multi-walled carbon nanotubes(MWCNT)and soft thermoplastic polyurethane(TPU)in N,N-Dimethylformamide solution by ultrasonic and de⁃positing them on carbon fiber surface by dip-coating technique.Scanning electron microscopy,atomic force micro⁃scopic,fourier transform infrared spectroscopy and Raman spectroscopy were used to characterize the surface of CF.The interfacial shear strength(IFSS)and pull-out displacement of CF/epoxy resin composites were tested by fiber pull-out testing.The results show that:MWCNT and TPU can uniformly distributed on the surface of CF by above method.Compared with pristine CF,the IFSS and pull-out displacement of modified CF were respectively improved by 163.3%and 52.8%due to the hydrogen bonding and mechanical interlocking between MWCNT and TPU,which indicates the“rigid-soft”interface layer have a positive effect on the enhancement for the interfacial strength and toughness of carbon fiber/epoxy resin composites.

关 键 词：复合材料 强韧化设计 界面剪切强度 界面韧性 

分 类 号：TB332[一般工业技术—材料科学与工程]