Abstract Microwave irradiation was applied to modify the carbon fibers immersed in water. The surface chemical composition and morphology of treated carbon fibers were investigated in detail. It showed that great numbers of oxygen-containing groups were introduced in treated carbon fiber surfaces and nitrogen heterocyclic rings of carbon fiber bulk exposed for the exfoliation of surface layers. The surface roughness of carbon fibers was enlarged by oxidative etching of microplasma excited by microwave irradiation, and some nano humps were formed on carbon fiber surfaces. Although the tensile strength of treated carbon fibers were slightly deteriorated, the interfacial shear strength of treated carbon fibers/epoxy resin composite, as compared with that of untreated carbon fibers/epoxy resin composite, was significantly enhanced. The modification mechanism is that the microplasma and the exfoliation of monolayer graphene oxide sheets lead to the variations of chemical structure and physical morphology in carbon fiber surfaces.

中文翻译：

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微波刻蚀碳纤维表面改性环氧树脂复合材料

摘要 采用微波辐照对浸入水中的碳纤维进行改性。详细研究了处理过的碳纤维的表面化学成分和形貌。结果表明，在处理过的碳纤维表面引入了大量含氧基团，碳纤维块体的氮杂环暴露用于表面层的剥离。微波辐照激发的微等离子体氧化刻蚀使碳纤维表面粗糙度增大，并在碳纤维表面形成一些纳米隆起。虽然经过处理的碳纤维的拉伸强度略有下降，但与未经处理的碳纤维/环氧树脂复合材料相比，经过处理的碳纤维/环氧树脂复合材料的界面剪切强度显着提高。