Thermal and mechanical properties of woodflour/tannin adhesive composites

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

San Pedro, Brasil

Simposio; Fourth International Symposium on Natural Polymers and Composites; 2002

Instrumentación Agropecuaria, EMBRAPA/CNPDIA, Instituto de Química de San Carlos, IQSC/USP, Facultad de Ciencias Agronomicas, FCA/UNESP

This work reports on the thermal and mechanical properties of composite materials formulated with a commercial tannin adhesive made from quebracho tannin extract and pine wood flour. Thermal transitions were measured by Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and Dynamic Mechanical Analysis (DMA). Final properties of the composite materials were evaluated as a function of the mass fraction of wood flour, in the range of 70 to 85 %. The mechanical characterization of these materials consisted in the measurement of flexural properties using three point bending tests. From these results, the elastic modulus and the ultimate strength and deformation were determined.