Thermal analysis and aging monitoring of biosourced resins

The resins developed with Fillaeopsis discophora tannin extract using either Vitellaria paradoxa trunk exudate as bio hardener or glyoxal as hardener were thermally analyzed using thermomechanical (TMA) and thermogravimetric (TGA) analysis. A microscopic interpretation of glass transition, physical aging, and phase segregation was analyzed and the relative activation energy was determined. The activation energies of gelling of the resins above are 57,658 and 52,967 J. mol −1 , respectively. Their glass transition temperatures are 172 °C and 149 °C respectively. The tannin extract used in the development of these two resins is of a condensed polyflavonoid type linked to some furan residues. The resin developed with the Vitellaria paradoxa exudate as a bio-hardener has a good thermal behavior and it degrades slower than that with glyoxal as hardener.