Improving the interfacial property of carbon fibre/epoxy resin composites by grafting amine‐capped cross‐linked poly‐itaconic acid

Abstract

To improve the interfacial properties of carbon fibre-reinforced polymer composites, a surface treatment was used to cap cross-linked poly-itaconic acid onto carbon fibres via in-situ polymerization after itaconic acid grafting. The chemical composition of the modified carbon fiber (CF) surface was characterized by X-ray photoelectron spectral and Fourier-transform infrared spectroscopy. Scanning electron microscopy and atomic force microscopy images showed that the poly-itaconic acid protective sheath was uniformly capped onto the CF surface and that the surface roughness was obviously enhanced. Chemical bonds also played a key role in the interfacial enhancement. The results showed that the interfacial shear strength of the composites with poly-itaconic acid on the carbon fibres (72.2 MPa) was significantly increased by 89.5% compared with that of the composites with pristine CF (38.1 MPa). Moreover, the poly-itaconic acid sheath promoted a slight increase in mono-fibre tensile strength. In addition, the interfacial mechanisms were also discussed. Meanwhile, the mechanical property of the functionalized CF/epoxy resin composites was also significantly improved. KEYWORDS carbon fibre, CFRP, in-situ polymerization, interfacial shear strength, itaconic acid

Enhanced properties of PAN‐derived carbon fibres and resulting composites by active screen plasma surface functionalisation

“…Extensive research has been conducted on the physico‐chemical interaction between CFs and the matrix, [ 4–6 ] and a range of surface‐engineering methods have been studied with the aim to enhance CF/substrate interfacial strength, such as chemical/electrochemical oxidation, plasma treatment, polymer grafting, sizing and nanoparticle coating. [ 3,7–12 ] All these techniques aim to modify the surface morphology of CFs, to introduce new chemical groups to the CF surface, and to change the surface free energy and hence improve the CF/matrix interfacial bonding.…”

Panoramic View of Interface-Related Thermo-oxidative Aging of Carbon Fiber-Reinforced Epoxy Composites

“…This disintegration of interfacial cohesion precipitates a precipitous degradation in the material’s mechanical properties. Consequently, the enhancement of interfacial binding interactions is imperative, and methods such as CF surface grafting have been posited as viable strategies to fortify this interconnection. ,− …”

Improved interfacial shear strength of CF/PA6 and CF/epoxy composites by grafting graphene oxide onto carbon fiber surface with hyperbranched polyglycerol

“…The mechanical and thermal properties of the resulting composites can thus deteriorate during use. Consequently, various approaches such as electrochemical modification, 5,6 chemical grafting, [7][8][9][10][11][12][13][14][15] and coupling agent coating, 16,17 have been developed to alter the interfacial adhesion properties between resins and carbon fibers. These existing techniques focus on carbon fiber surface modification, which aim to enhance the interfacial adhesion strength of composites via increasing surface roughness, wettability of carbon fiber or chemical bonding at fiber-matrix interfaces.…”