Influence of moisture regain on effects of atmospheric pressure plasma treatment

As to the existence of water in atmospheric pressure plasma(APP) treatment,the influence of aramid fiber moisture regain on the atmospheric pressure plasma treatment effects was investigated.The aramid fibers with different moisture regains(0.5%,3.5%,5.5%) were treated by atmospheric pressure plasma.The dynamic 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.It was discovered that with the increment of fiber moisture regain,the advancing and receding angles were decreased,while the IFSS,roughness and polar groups on the treated fiber surface were increased.Therefore,it was concluded that the existence of water in fiber promoted the atmospheric plasma treatment effects in surface property improvement of aramid fiber.