WETTABILITY STUDY AND SURFACE CHARACTERIZACION BY CONFOCAL LASER SCANNING MICROSCOPY OF ROTARY-PEELED WOOD VENEERS

Gonzalo Vázquez, Cristina Galiñanes, M. Sonia Freire, G. Antorrena, Julia González-Alvarez

Abstract


The aim of this work was to study the surface properties of rotary-peeled veneers of five species ofhardwoods: okume, ayous, poplar, fromager and eucalyptus and to compare the behavior of both sidesof the veneers. The equilibrium contact angles were determined together with the wood surface freeenergy and its polar and disperse components. Additionally, surface roughness was evaluated usingconfocal laser scanning microscopy. Surface free energy ranged from 49-64 mJ/m2 and decreased in theorder okume> fromager> poplar> eucalyptus ~ ayous, indicating a decrease in wettability in that order.Okume wood with the highest value of the surface free energy and the lowest values of the equilibriumcontact angle was confirmed as the species with the best wetting properties, and also presented the highestvalues of surface roughness parameters. In general, there were not significant differences between theproperties of both sides of the veneers, except for roughness. The largest differences were obtained forokume veneers whose interior side showed higher wettability.

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