As to the existence of water in atmospheric pressure plasma (APP) treatment, ultrahigh modulus polyethylene (UHMPE) fibers were treated using atmospheric pressure plasma in three different relative humidity levels, namely 5% , 65% and 95%. The static contact angle and the interfacial shear strength ( IFSS) of the control and the treated fibers were measured. The morphological and chemical changes on the fiber surface were characterized by atomic force microscopy ( AFM ) and X-ray photoelectron spectra ( XPS) respectively. After the plasma treatments, the surface roughness, the number of oxygen containing groups and IFSS increased while the water contact angle decreased and the tenacity did not change. The contact angle and IFSS did not obviously decrease and increase as the environmental moisture content increased. It was demonstrated that the moisture in the APP environment could contribute to the improvement of the effects of atmospheric pressure plasma treatment of hydrophobic fibers, but the influence was not significant.%针对常压等离子体处理过程中水分存在的问题,在空气相对湿度分别为5％、65％和95％时,对超高模量聚乙烯进行常压等离子体处理,测定处理前后纤维的静态接触角以及纤维与树脂间的层间剪切强度,采用原子力显微镜和X射线光电子能谱探测纤维表面的变化.结果表明,处理后纤维表面粗糙度、含氧基团和纤维与树脂间的层间剪切强度增加,静态接触角减小,纤维强度不变.随着环境湿度的增加,纤维静态接触角的减少和纤维与树脂间的层间剪切强度的增加不明显,从而说明在常压等离子体处理拒水性纤维的过程中,空气中的水分有助于提高其处理效果,但不显著.
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