碳纤维表面处理及其复合材料界面优化的研究Ⅱ．低温等离子处理对碳纤维表面浸润特性的影响

采用毛吸浸润法，研究了氧等离子及氩等离子处理对聚丙烯腈基碳纤维表面浸润特性的影响。发现了等离子处理可以使碳纤维表面对水的浸润性能大为改善，氧等离子处理效果更为明显。对在碳纤维表面预涂不饱和酸酐，经等离子处理可产生接枝的现象进行了验证，并发现接枝马来酸酐后浸润性能反而比原纤维有所下降。经等离子处理的纤维随其接触空气时间的延续，表面浸润性能不断退化，纤维对水的接触角呈曲折形式逐步增加。

Studies on the Surface Treatment of the Carbon Fiber and Optimization of Its Composite InterfaceII.Effect of Plasma Treatment on the Wicking Character of the Surface of Carbon Fibers

The wicking method is used for investigating the effect of plasma treatment onthe wettability of polyacrylonitrile-based carbon fibers.It is found that the wettability ofthe fiber can be improved continuously with increasing plasma power or extending treatmenttime and improved more greatly with O_2 plasma treatment than with Ar plasma treatment.However,there exists a limit of treating power or treating time. When exceeding the limit.the wettability of the fiber will go bad instead.Furthermore,the graft-polymerization methodthat the maleic anhydride is coated on to the surface of the carbon fiber which is treated withO_2 plasma later,is verlfied.It can be seen that the wettability of the grafted caibon fiber isnot better than of urltreated fiber at last,it is made clear that after plasma trcatment,the wett-ability of the fiber surface wiil deeay gradually with the time for the fiber existing in air.The contact angle of fiber with water increases zigzag after O_2 plasma treatment.