电化学表面处理PAN基炭纤维的表面性能研究  

Surface properties of electrochemically oxidized PAN-based carbon fibers

作　　者：刘鸿鹏[1] 吕春祥[1] 李永红[1] 杨禹[1] 李开喜[1] 贺福[1] 

机构地区：[1]中国科学院山西煤炭化学研究所炭材料重点实验室

出　　处：《新型炭材料》2005年第1期39-44,共6页New Carbon Materials

基　　金：中国科学院创新方向项目 (KGCX2 SW 204);山西省自然科学青年科技研究基金 (20021013);国家自然科学重点基金(50333070)。~~

摘　　要：　以NH4HCO3为电解质对PAN基炭纤维进行了连续表面处理,并利用X射线光电子能谱 (XPS)、X射线衍射(XRD)、拉曼光谱、扫描电子显微镜(SEM)和自动电位滴定等方法,系统研究了电化学氧化反应后炭纤维表面石墨微晶尺寸的变化规律,推导出微晶宽度(La)、微晶厚度 (Lc)与电流密度 (J)之间存在线性关系式;同时,经电化学氧化处理后,炭纤维表面含氧官能团的摩尔分数增加 8.54%,表面吸附水的摩尔分数增加 5.34%,使其表面由憎液性变为亲液性,这有利于提高炭纤维增强树脂基复合材料(CFRP)的层间剪切强度(ILSS)。High strength PAN-based carbon fibers were continuously electrochemically oxidized by applying current to the fibers serving as an anode in aqueous NH4HCO3. Graphite crystallites on the surface of electrochemically oxidized carbon fibers were investigated by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and conductometric titration. It was found that after the electrochemical oxidation, the total amount of oxygen -containing groups on the fiber surface was increased by 8.54 % and the amount of water- absorption on the surface increased by 5.34 % . This suggests a surface property change from hydrophobic to hydrophilic, and as a result, the interlaminar shear strength of polymers reinforced with these fiber was significantly increased. A linear relationship between crystallite size ( Lc, La) and current density was also found.

关 键 词：PAN炭纤维 电化学氧化 表面性能 电化学表面处理技术 X-射线光电子能谱法 电位滴定法 

分 类 号：TQ342.742[化学工程—化纤工业]