碳纤维表面氧化的研究

Oxidation on the Surface of Carbon Fibers

采用浓硝酸作为氧化剂氧化碳纤维，研究碳纤维表面含氧基团（包括羧基、羟基和酸性基团）与氧化时间和氧化温度的关系，并用扫描电镜和傅立叶红外光谱对碳纤维的表面含氧基团进行表征．结果发现，随着氧化时间的延长和氧化温度的升高，碳纤维表面的含氧基团均增加．当用热空气氧化时，碳纤维表面的酸性基团随温度的升高有所增加，但温度超过３５０℃时，碳纤维表面的羧基反而减少．

For studying the oxidation on the surface of carbon fibers,concentrated nitric acid is adopted as oxidant;scanning electron microscope and Fourier infrared spectrum are applied to the characterization of oxygen containing groups including carboxyl groups and hydroxyl groups and acidic groups.The study focuses on the relation between oxygen containing groups on the surface of carbon fibers and oxidation time and oxidation temperature.As shown by the results,along with the prolongation of oxidation time and the rise of oxidation temperature,the oxygen containing groups increase;when the carbon fibers are oxidized by hot air,the acidic groups on their surface increase with the rise of oxidation temperature,and contrarily,the carboxyl groups on their suface decrease in case the temperature exceeds 350 ℃