有机电解液电化学改性PAN基碳纤维的表面性能

Surface Properties of PAN-based Carbon Fibers Modified by Electrochemical Oxidization in Organic Electrolyte Systems

分别采用脂肪醇聚氧乙烯醚磷酸酯、三乙醇胺和脂肪醇聚氧乙烯醚磷酸酯铵盐3种有机电解液对PAN基碳纤维进行电化学氧化改性,通过化学滴定法、单纤维断裂强度测试和场发射扫描电镜考察改性前后碳纤维表面酸性官能团含量、力学性能及表面形貌的变化规律,得到电化学改性的最佳条件:浓度5%(质量分数)的O_3PNH_4乳液为电解液,电流密度为2A/g,恒温50℃电化学氧化2min。针对改性处理后的碳纤维的表面性能,进行X射线光电子能谱和单纤维接触角测试。结果表明:以O_3PNH_4为电解液对碳纤维电化学改性,可以在不影响碳纤维力学性能的前提下,增加碳纤维表面的酸性官能团,提高碳纤维的表面能。

PAN-based carbon fibers were modified by electrochemical oxidization using fatty alcohol polyoxyethylene ether phosphate（O3P）,triethanolamine（TEOA）and fatty alcohol polyoxyethylene ether ammonium phosphate（O3PNH4）as organic electrolyte respectively.Titration analysis,single fiber fracture strength measurement and field emission scanning electron microscopy（FE-SEM）were used to evaluate the content of acidic functional group on the surface,mechanical properties and surface morphology of carbon fiber.The optimum process of electrochemical treatment obtained is at50℃for 2min and O_3PNH_4（5%,mass fraction）as the electrolyte with current density of 2A/g.In addition,the surface properties of modified carbon fibers were characterized by X-ray photoelectron spectroscopy（XPS）and single fiber contact angle test.The results show that the hydrophilic acidic functional groups on the surface of carbon fiber which can enhance the surface energy are increased by the electrochemical oxidation using O_3PNH_4 as electrolyte,almost without any weakening to the mechanical properties of carbon fiber.