Bonding Performance of Wood Treatment by Oxygen and Nitrogen Cold Plasma

Abstract

The wood were treated by N2,O2cold plasma with the processing power 300W, the treatment duration 5 min, then the treated wood was bonded with MUF to valve the bonding performance, the contact angles of the treated/untreated wood were tested. The chemical composition on the surface of wood with or without N2cold plasma treatment also was analyzed by X-ray photoelectron spectroscopy (XPS). The results showed: the contact angles of the surface decreased, the surface free energy increased evidently that treated by N2or O2cold plasma, and the average bonding performance of wood that treated by cold plasma (whether N2or O2) increased obviously, more than 50% comparing with that untreated. The XPS analysis showed the atomic ratio O/C has increased, and more groups were oxidized or more peroxides were formed on the surface of wood, and the N element was introduced to the wood surface after nitrogen cold plasma treatment and it was guessed to the group of –NH2.