THERMO-MECHANICAL BEHAVIOR OF WOODFLOUR/TANNIN ADHESIVES COMPOSITES.

M. MOSIEWICKI; M. I. ARANGUREN; J. BORRAJO

Viña del Mar, Chile

Simposio; Segundo Simposio Binacional de Polímeros Argentino-Chileno/Archipol II; 2003

Universidad de Chile

Industrial polyflavonoid tannin extracts are polymeric materials composed mostly of flavan-3-ols repeating units and smaller fractions of polysaccharides and sugars. Tannin adhesives, based on a renewable resource, are obtained by hardening the tannin extract by reaction with hexamethylenetetramine (HEXA) crosslinking agent [1,2]. On the other hand, the use of woodflour as a reinforcing filler is an attractive commercial alternative, because of its low cost and wide availability. The focus of this work is on the analysis of the thermal and mechanical properties of composite materials formulated with a commercial quebracho tannin adhesive, pine woodflour and HEXA as hardener. The effect of moisture on the final properties of these materials is also addressed.