Abstract:

In this paper,the change of contact angle and surface free energy of two species of wood Chinese fir (Cunninghamia lanceolata) and Poplar Sanbei No.1(Populus nigra×P.simonii cv.`Zhonglin Sanbei-1')before and after acetylation and graft copolymerization of 1-Phenylethene were investigated.The effects of esterification and graft copolymerization on surface free energy of wood were analyzed.The result showed that the contact angle of liquid on the surface of two species of wood is enlarged after the process of estrification and graft copolymerization.The effect of the esterification on contact angle is obviously bigger than that of graft copolymerization.The surface free energy of Chinese fir and Poplar Sanbei No.1 are 42.8mN/m and 52.3mN/m respectively,which are similar to most other species of wood.The surface free energy is reduced after esterification and graft copolymerization process,the reduce degree of esterification is affected with different species,but the reduce degree of graft coplymerization is hardly affected with species.

Key words: Surface free energy, Contact angle, Esterification, Graft copolymerization