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

Abstract

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

CLC Number:

TB332

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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