木材酯化及接枝共聚处理对木材表面自由能影响的研究

采用接触角测定法，对经用乙酰化法酯化和苯乙烯单体接枝共聚处理改性前后的杉木和杨树表面接触角的变化和表面自由能变化值进行了研究，确定了木材的酯化和接枝共聚改性对木材表面自由能变化的影响因素，研究结果表明，在酯化和接枝改性处理后，液体在杉木和杨木表面上的接触角比在未经处理的木材表面的接触角有所增大，酯化处理产生的接触角增大作用要比接枝共聚所产生的作用大，杉木和“三北一号”杨的表面自由能分别为４２.8mN/m和５２.3mN/m与大部分木材垢表面自由能相近，木材的酯化的接枝共聚改性可以隆低木材的表面自由能，但酯化对表面自由能的降低各充受树种的影响，而接枝共聚改性对表面自由能的降低基本上不受处理树种的影响。

A STUDY ON EFFECT OF ESTERIFICATION AND GRAFT COPOLYMERIZATION PROCESS ON SURFACE FREE ENERGY OF WOOD

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.