电化学阴阳极交变处理对碳纤维表面组成和微观结构的影响

Effect of Electrochemically Anode and Cathode Alternating Treatment to Surface Composition and Microstructure on the Carbon Fibers

采用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)方法,尝试将电化学阴阳极交变技术应用于碳纤维表面处理,研究了电化学阴阳极交变处理对PAN基碳纤维表面组成和微观结构的影响。结果表明,电化学阴阳极交变处理使碳纤维表面沟槽加深,可以增加碳纤维与基体的锚固作用;表面C含量降低而O含量升高,表面含氧官能团中COOH含量明显增加,而C-OH含量减少,增大了碳纤维的表面活性,使其更有利于与基体以化学键的形式结合;同时电化学阴阳极交变处理碳纤维过程中阴极产生的氢能渗入碳纤维内部,使碳纤维晶体结构的微观尺寸发生变化,(002)晶面间距d(002)增大,堆垛厚度Lc增大,使得碳纤维直径增大。处理后层间剪切强度(ILSS)明显增加以及部分组别碳纤维的拉伸强度(Tensile strength,TS)增加。

Electrochemically anode and cathode alternating technology applied to the carbon fiber surface treat- ment for the first time, scanning electron microscope （SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffrac- tion （XRD） were used to study the surface composition and microstructure of PAN-based carbon fiber treated by elec-~ trochemically anode and cathode alternating treatment. The results show that, the electrochemically alternating anode and cathode method can make the carbon fiber surface grooves deepen, which can increase the anchoring effect of the carbon fiber with the matrix; the content of carbon atoms reduced and the content of oxygen atoms increased, the con- tent of COOH significantly increased while the content of OH reduced in the oxygen-containing functional groups on carbon fibers surface,which increased the activity of the carbon fiber surface and made them more conductive to the form of chemical bonding with the substrate; the hydrogen produced by cathode can penetrate inside the carbon fiber, so the microscopic size of the carbon fiber crystal structure changed, interplanar spacing d（002） and the stacking thickness Lo increased, which cause the carbon fiber diameter increased. The tensile strength （TS） of some groups of the carbon fibers after treatment increased, while interlaminar shear strength （ILSS） significantly increased.