SciELO - Scientific Electronic Library Online

 
vol.33 issue4Study of trust relationships in private woodlot production for a cellulose industry from the point of view of rural producersMechanical properties of structural pieces of Pinus spp: relationship between tensile strength and visual grading author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Revista Árvore

Print version ISSN 0100-6762

Abstract

CARNEIRO, Angélica de Cássia Oliveira et al. Effect of the acid hydrolyses of Eucalyptus grandis w. hill ex Maiden tannins in the properties of the tannic adhesives. Rev. Árvore [online]. 2009, vol.33, n.4, pp. 733-739. ISSN 0100-6762.  http://dx.doi.org/10.1590/S0100-67622009000400016.

The objective of this research was to evaluate the effect of the acid hydrolysis of Eucalyptus grandis W. Hill ex Maiden bark tannins on the properties of tannic adhesives. Adhesives were synthesized with tannins hydrolyzed at four pH values, three reaction times and 10% of formaldehyde based on the tannin dry weight. Ninety-six glued joints were prepared with Eucalyptus grandis thin boards. Shear resistance and wood failure percentage were determined according to the ASTM D 2339-93 standards. It was concluded that tannin hydrolysis decreased adhesive viscosity and increased the glue line shear resistance. However, it was observed a low percentage of wood failure.

Keywords : Bark; tannins; adhesives.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese