Abstract. Maleic anhydride functionalized graphene oxide (MAH-GO) was synthesized and then introduced into carbon fiber (CF) reinforced bismaleimide (BMI) composites, with the aim of improving the interfacial adhesion strength between CF and BMI resin. Various characterization techniques including Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectra (XPS) and thermogravimetric analysis (TGA) demonstrated that the maleic anhydride has been successfully grafted onto the GO surfaces. The study showed that the interlaminar shear strength (ILSS) and flexural properties of CF/BMI composites were all improved by the incorporation of GO and MAH-GO, and the MAH-GO showed the substantially improved effect due to the strong interaction between the MAH-GO and the resin matrix. The maximum increment of the ILSS, flexural strength and flexural modulus of composites were 24.4, 28.7 and 49.7%, respectively. Scanning electron microscope (SEM) photographs of the fracture surfaces revealed that the interfacial bonding between CF and resin matrix was significantly strengthened by the addition of MAH-GO. The results suggest that this feasible method may be an ideal substitute for the traditional method in the interfacial modification of composites.
Organo-montmorillonite (OMMT) modified bismaleimide (BMI) nanocomposites were used as the matrix of glass fibre and carbon fibre reinforced composites. The effects of OMMT on the mechanical properties of BMI resin and fibre composites were investigated. Fourier transform infrared spectroscopy (FT-IR) analysis revealed that there exist interactions between OMMT and resin, which is useful for the delamination and dispersion of the silicate layers within the BMI matrix. Owing to the incorporation of OMMT, the impact strength, flexural strength and modulus of BMI resin were substantially improved. Moreover, the interlaminar shear strength (ILSS), flexural strength and modulus of fibre composites were enhanced. Scanning electron microscopy (SEM) photographs exhibited that the destruction modes of fibre composites were changed from interfacial destruction into the matrix destruction after the introduction of OMMT. In addition, it was found that the interfacial adhesion of glass fibre composite was improved more significantly than that of carbon fibre composite.
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