The wettability improvement research of carbon fiber composites modified by plasma activation

In order to improve the wettability of carbon fiber reinforced resin matrix composites(CFRP),plasma activation of CFRP surface was provided by Hall discharge plasma,and the effect of different plasma activation parameters(pressure,current and activation time)and the change of wettability of activated CFRP preserved in different conditions were learned.Many methods such as contact angle measurement,metallographic microscopic analysis and infrared spectroscopic analysis,were used to research the wettability,microstructure,and type of functional groups of the CFRP surface respectively.Research results show that the wettability of CFRP surface was improved after plasma activated with different working parameters.Infrared spectroscopic analysis indicates that the quantities of C—C and C—O bonds on the surface of activated CFRP are decreased and increased respectively.Besides,carboxyl groups,ketone groups and alcoholic hydroxyl groups were increased,while ester groups are decreased,which contributes to the remarkable improvement of wettability.Although the activated effect will reduce over time,preservation in water of room temperature can delay this reduction.