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Outline
The interfacial structure of carbon fiber-reinforced polymer （CFRP） is crucial to the performance of composites， which represents a fundamental aspect of composite materials science research. The research on carbon fiber surface treatment is an important part of the research on composite material interfaces. By changing the physicochemical structure of the carbon fiber surface， better interface properties can be imparted to the composites. In this paper， an anodic oxidation surface treatment method based on acidic medium is adopted. Dilute sulfuric acid solutions of different concentrations are used as electrolytes to construct functional groups on the carbon fiber surface at different current densities. The results show that the carbonyl functional group （CO） plays an important role in the interface properties of CFRP. In anodic oxidation treatment， a lower current density is conducive to generating more CO on the surface of carbon fiber. There is an optimal value for the influence of sulfuric acid concentration on CO. Moreover， adjusting the sulfuric acid concentration can achieve more accurate construction of CO on the carbon fiber surface. When the current density is 0.31 mA/cm2 and the sulfuric acid concentration is 0.3%（mass fraction）， the CO content on the carbon fiber surface reaches the maximum value of 6.49%， and the interfacial shear strength with epoxy resin also reaches the maximum value of 76.9 MPa. Compared with untreated carbon fibers， it is increased by 111.3%， reflecting a strong correlation. This is because the dispersion interaction between CO and the groups in epoxy resin enhances the bonding ability between carbon fiber and epoxy resin.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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