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.

中文翻译：

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HNO3和KOH碳纤维表面处理对PMMA树脂复合材料界面结合的影响

这项工作研究了 HNO3 处理和 KOH 处理的碳纤维的表面、界面态和物理化学性能。采用表面处理的碳纤维作为增强材料，通过热压罐成型工艺制备了聚甲基丙烯酸甲酯（PMMA）复合材料。研究了碳纤维表面的物理化学状态以及复合材料的微界面性能和层间剪切性能。结果表明，经HNO3处理的碳纤维表面具有更多的沟槽结构和更高的表面粗糙度，从而与树脂基体形成更好的物理结合。虽然两种碳纤维的含氧官能团相当，但经HNO3处理的碳纤维表面氧含量较高，有利于与基体树脂形成更好的化学键，界面剪切强度约为比经KOH处理的碳纤维复合材料高14%。