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 resin on 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.