Air cold plasma modification on PBO fiber surface

The modification of plasma treatment of PBO (poly(p-phenylene benzobisoxazole)) fiber surface was studied. AFM and XPS were used to analyze the influences of treating time on the morphology and the surface composition of PBO fiber respectively. The changes of fiber surface wettability and surface groups were determined by dynamic wettability test equipment and IR spectrum. The interfacial shear strength (IFSS) between fibers and resin was measured by the microbond test. The broken composites were analyzed by SEM. The results show that the wettability of the fiber surface after plasma treatment is improved and that many hydroxy groups are introduced to benzene rings on the fiber surface. Under the optimum plasma treatment parameters of 170 W and 10 min, the IFSS is improved by 64.7%. The fiber surface rough degree and oxygen content are the greatest. The ratio of oxygen to carbon is improved by 50.5%.