This work studied the surface, interface state and physicochemical properties of HNO3-treated and KOH-treated carbon fiber. Poly(methyl methacrylate) (PMMA) composites were prepared by the autoclave molding process using surface-treated carbon fiber as reinforcements. The physical and chemical states of the carbon fiber surfaces and the micro-interface properties and interlaminar shear properties of the composites were studied. The results show that the surface of the HNO3-treated carbon fiber has more groove structure and higher surface roughness and thus forms a better physical bond with the resin matrix. Although the oxygen-containing functional groups of the two carbon fibers are equivalent, the surface oxygen of the HNO3-treated carbon fiber is relatively high, which is beneficial to form a better chemical bond with the matrix resin, and the interfacial shear strength is about 14% higher than that of the KOH-treated carbon fiber composite.
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Carbon fiber (CF) and MXene were filled in polyimide (PI) to prepare the CF/MXene/PI composite by compression molding. High-resistance meter, thermal conductivity tester, and scanning electron microscope were used to study the antistatic performance, thermal performance, and mechanical performance of the CF/MXene/PI composite, and the effect of heat treatment on the composite’s mechanical properties is discussed. The results show that when the mass fractions of CF and MXene increase, the tensile strength and impact strength of CF/PI and CF/MXene/PI composites all show a trend of first increasing and then decreasing. And when the mass fractions of CF and MXene are 15% and 3%, respectively, the performance of the CF/MXene/PI composite is better. The thermal conductivity of the CF/MXene/PI composite shows an increase with increase in the mass fraction of MXene. Heat treatment affects the mechanical properties of the CF/MXene/PI composite. When the treatment temperature is >240°C, the tensile strength and impact strength of the composite do not change much.
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