Date of Award
Doctor of Philosophy
Effects of white oak heartwood extractives on phenol-formaldehyde adhesive bond quality were investigated. Removal of extractives from white oak wood specimens by solvent extraction showed no significant improvement in adhesive bond quality. This is attributed to the removal of most extractives from wood surfaces by the planing of wood specimens prior to solvent extractions. Adhesive bond strength and durability were significantly reduced when 2% and 10% of white oak heartwood extracts, based on resin solids, were applied to hard maple surfaces before gluing. Results suggest that the water-soluble extractives, especially reducing sugars and oligosaccharides with reducing ends interfere with the proper curing and setting of phenolic resins. Adhesive bond quality of white oak could be improved by using a low-viscosity phenol-formaldehyde resin.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Wang, Ying-Shen, "Influence of extractives on bonding properties of white oak " (1992). Retrospective Theses and Dissertations. 10159.