常压氩气等离子体对碳纤维表面亲水改性研究

Hydrophilic Modification of Carbon Fibers by Argon Plasma at Atmospheric Pressure

该文采用常压氩气等离子体对水溶液中的碳纤维进行表面改性处理,以去除碳纤维表面浆料,并实现碳纤维的亲水功能化改性。通过扫描电子显微镜、红外光谱、X射线光电子能谱、水静态接触角测试及力学性能测试对改性后的碳纤维进行研究分析。结果表明,等离子体改性处理既可以去除纤维表面的浆料和杂质污染物,保持纤维原有的凹凸沟槽形貌特征,又可以引入大量含氧极性基团。进一步分析表明,等离子体改性处理120 s可以使纤维获得最优的浸润性能,水静态接触角可以降至45.1°。力学性能测试结果表明,这种等离子体改性方法对纤维的力学性能几乎没有影响,处理300 s后仍可保持碳纤维的抗拉强度在3.23 GPa。

In this paper, atmospheric argon plasma was utilized to achieve surface cleaning and wettability modification of carbon fibers in aqueous solution. The morphology of fiber was characterized by scanning electron microscopy, surface chemical structure and composition were determined by fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, and water contact angle and tensile strength were also tested. The results show that plasma treatment can not only remove the size and impurities on the fiber surface, but also maintain the original surface morphology, and introduce a large number of oxygen-containing polar groups. Further analysis indicates that fibers exhibit the best performance when they are treated with plasma for 120 s, and the water contact angle of fiber can be reduced to 45.1°. Moreover, little influence has been found for the plasma modification on the mechanical properties of fibers, and the tensile strength of carbon fiber can still be kept at 3.23 GPa after 300 s plasma treatment.