Abstract
This article presents an investigation about use of tannins, natural polyphenols as eco‐friendly and renewable fillers in epoxy composites. The influence of tannins addition on the thermal and curing properties of epoxy-tannins composites were investigated using differential scanning calorimetery (DSC) technique. Composites containing 5, 20 and 40 wt.% of tannins were characterized by a single exothermic peak due to crosslinking reactions which was observed in the temperature range of 85-155°C. The curing of the composites was found to follow the same behavior of unmodified epoxy, thereby indicating that the tannins do not hinder the curing reactions. The kinetics show that the activation energy of the curing reactions of epoxy-tannins composites was found to be in the range of 48-56 kJ.mol−1
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