含碳纳米管上浆剂上浆改性碳纤维及其界面研究

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (8): 64-69.

含碳纳米管上浆剂上浆改性碳纤维及其界面研究

柴进¹, 孔海娟^1*, 张新异¹, 余木火²

1.上海工程技术大学材料工程学院,上海201620;
2.东华大学轻质结构复合材料上海市重点实验室,上海201620

收稿日期:2019-11-25 出版日期:2020-08-28 发布日期:2020-08-28
通讯作者: 孔海娟(1985-),女,讲师,博士,主要研究方向为高性能纤维及其复合材料,konghaijuan@sues.edu.cn。
作者简介:柴进(1992-),男,研究生,主要研究方向为碳纤维复合材料。
基金资助:
国家自然基金青年基金项目(51603120);纤维材料改性国家重点实验室资助课(LK1602)

STUDY ON THE INTERFACE OF CARBON FIBER MODIFICATION THROUGH SIZING AGENT CONTAINING CARBON NANOTUBES

CHAI Jin¹, KONG Hai-juan^1*, ZHANG Xin-yi¹, YU Mu-huo²

1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2. Shanghai Key Lab of Lightweight Composite, Donghua University, Shanghai 201620, China

Received:2019-11-25 Online:2020-08-28 Published:2020-08-28

摘要/Abstract

摘要： 碳纤维(CF)是一种高强度、高模量的高性能纤维,被广泛应用于复合材料中,但是纤维表面的活性官能团含量低,与基体之间的界面结合性能较差。本文利用含氨基化碳纳米管(NH₂-CNTs)上浆剂对光威GQ4922/12K型碳纤维表面进行改性,改善碳纤维与环氧树脂之间的界面结合性能。通过傅里叶红外光谱、扫描电镜、X射线光电子能谱、接触角和微脱粘对改性后的纤维表面组成、表面形貌、表面自由能和界面剪切强度进行分析,发现NH₂-CNTs可成功接枝到碳纤维表面,改性后纤维表面的氧(氮)元素含量增加,与水接触角从67.1°降低到50.5°,表面自由能从32.2 mN/m增加到了41.1 mN/m;界面剪切强度在氨基化碳纳米管质量浓度为0.6%时达到最大,相比未改性纤维从62.3 MPa提高到76.8 MPa,提高了23.3%。结果表明通过在上浆剂中引入氨基化碳纳米管,可以增加碳纤维表面活性,提高碳纤维与基体树脂的界面结合性能。

关键词: 碳纤维, 上浆剂, 碳纳米管, 界面结合性能, 复合材料

Abstract: Carbon fiber (CF) is a high-strength, high-modulus, high-performance fiber widely used in composite materials. However, the interfacial bonding property with the substrate is poor due to the low content of reactive functional groups on the surface of the fiber. In this paper, the surface of GQ4922/12K carbon fiber was modified by using sizing agent containing aminated carbon nanotubes (NH₂-CNTs) to improve the interfacial bonding performance between carbon fiber and epoxy resin. The surface functional group and element composition, surface morphology, surface free energy and interfacial shear strength of the modified fiber were analyzed by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, contact angle measuring instrument, respectively. The results showed that, NH₂-CNTs were successfully grafted onto the surface of carbon fiber, the content of oxygen (nitrogen) element on the surface of the fiber increased, the contact angle with water decreased from 67.1° to 50.5°, and the surface free energy increased from 32.2 mN/m to 41.1 mN/m. The shear strength reached a maximum at an aminated carbon nanotube concentration of 0.6%, which was 23.3% higher than that of the unmodified fiber, from 62.3 MPa to 76.8 MPa. As a result, the surface of carbon fiber can increase the surface activity by introducing the amino carbon nanotubes in the sizing agent, and improve the interfacial bonding property between the carbon fibers and the matrix.

Key words: carbon fiber, sizing agent, carbon nanotube, interface property, composites

中图分类号:

TB332

柴进, 孔海娟, 张新异, 余木火. 含碳纳米管上浆剂上浆改性碳纤维及其界面研究[J]. 复合材料科学与工程, 2020, 0(8): 64-69.

CHAI Jin, KONG Hai-juan, ZHANG Xin-yi, YU Mu-huo. STUDY ON THE INTERFACE OF CARBON FIBER MODIFICATION THROUGH SIZING AGENT CONTAINING CARBON NANOTUBES[J]. Composites Science and Engineering, 2020, 0(8): 64-69.

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