温度变化对酚醛胶在竹材表面动态润湿性的影响

为了探讨温度变化对酚醛胶在竹材表面润湿性的影响，该文采用测量动态接触角方法，用润湿模型分析了酚醛胶在20、60、80和100℃环境下，对层积材用竹片青、黄表面的润湿性和铺张渗透系数k值的影响. 结果表明:酚醛胶在竹青和竹黄表面的润湿性差异不显著；随着温度的升高，接触角(起始和平衡接触角)增大，k值减小，竹材表面的润湿性、铺张和渗透性变差；但温度变化对竹青和竹黄表面k值影响的规律不同；随着温度的升高，竹材表面的酚醛胶会出现收缩、干瘪现象，温度越高，出现干瘪、收缩时间越短. 

Effects of temperature on the dynamic adhesive wettability of PF resin on bamboo surface

Dynamic contact angle analysis technique was used to investigate the effects of temperature on the dynamic adhesive wettability of phenol_formaldehyde（PF）resin on bamboo surface. By applying the wetting model, the spreading and penetration rate (k_value) of PF resinon bamboo surfaces (the outer and inner layers) at different temperatures (20, 60, 80, and 100℃) were compared. The results showed no significant differences in the wettability of PF resin between the outer and inner layers of bamboo. As temperature increased, the contact angles (both initial and equilibrium) also increased but the k_value decreased. These results indicated that the ability of the adhesive wetting on the bamboo surfaces for the PF resin was reduced as the temperature increased. However, the effects of temperature on the k_values were different between the inner and outer layers. Shrinking and shriveling occurred at elevated temperatures. And the higher the temperature was, the quicker the shrinking and shriveling occurred. The results obtained from this research provide guidance for the application and assembly time of resin on bamboo surfaces.