How overdrying wood reduces its bonding to phenol-formaldehyde adhesives : a critical review of the literature. Part II, Chemical reactions

摘要: Literature dealing with the effect of excessive drying (overdrying) on wood surface inactivation to bonding is reviewed in two parts and critically evaluated, primarily for phenolic adhesives. Part I review, published earlier, covers physical mechanisms that could contribute inactivation. The principal mechanism migration extractives decrease wettability. II review considers involving chemical reactions: reduction strength, oxidation pyrolysis sites, interference resin cure or bonding. In those cases where are not primary cause inactivation, probably major Inactivation oak some Southeast Asian hardwoods may be due acidity extractives, but importance decreased wettability caused by cannot dismissed.