酸碱电解质对碳纤维表面电化学活化的影响  

Effect of acid and alkaline electrolytes on electrochemical activation of carbon fiber surfaces

作　　者：马崇攀 张洋[1] 孙忠霄 刘云芳[1,2] 王宇 MA Chongpan;ZHANG Yang;SUN Zhongxiao;LIU Yunfang;WANG Yu(School of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Key Laboratory of Carbon Fiber and Functional Polymer,Ministry of Education,Beijing 100029,China)

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《石油化工》2023年第5期637-644,共8页Petrochemical Technology

基　　金：国家自然科学基金项目(52102033);国家重点研发计划(2022YFB3706502)。

摘　　要：以超高惰性表面沥青基碳纤维为研究对象,采用XPS、Raman光谱、动态接触角、单丝拉伸强度和层间剪切强度(ILSS)等方法考察了H_(2)SO_(4)和NH_(4)HCO_(3)电解质对碳纤维表面电化学活化的影响。实验结果表明,以1%(w)的H_(2)SO_(4)为电解质时最优电流强度为1 A,碳纤维的拉伸强度保留率为86%,ILSS为39.7 MPa,较未处理碳纤维提高了64%;以4%(w)的NH_(4)HCO_(3)为电解质时最优电流强度为2 A,处理后碳纤维的单丝拉伸强度不变,ILSS为39.3 MPa。受酸碱环境电解产生活性氧的机理影响,以NH_(4)HCO_(3)为电解质时,活性氧产生速率相对较慢,氧化环境相对温和,碳纤维表面受损较弱,力学性能保留率较高。Taking the pitch-based carbon fiber with ultra-high inert surface as research object,the effects of H_(2)SO_(4) and NH_(4)HCO_(3) electrolytes on electrochemical activation of carbon fiber surfaces were studied by means of XPS,Raman,dynamic contact angle,monofilament tensile strength and interlayer shear strength(ILSS)and other test methods.The experimental results show that when the 1%(w)H_(2)SO_(4) is used as electrolyte with the optimal electric current of 1 A,the tensile strength retention of carbon fiber is 86%,and the ILSS is 39.7 MPa which is 64% higher than that of untreated carbon fiber.When the 4%(w)NH_(4)HCO_(3) is used as electrolyte with the optimal electric current of 2 A,the monofilament tensile strength of the treated carbon fiber is not changed,and the ILSS is 39.3 MPa.Affected by the different mechanism of generating reactive oxygen species by electrolysis in acid and alkali environments,when NH_(4)HCO_(3) is used as the electrolyte,the generation rate of reactive oxygen species is relatively slow,and the oxidation environment is relatively mild,so the surface damage of carbon fibers is weak,therefore,the mechanical properties retention is high.

关 键 词：碳纤维 电解质 表面活化 酸碱介质 

分 类 号：TQ342.31[化学工程—化纤工业]