DIFFERENTIAL SCANNING CALORIMETRY AND THERMAL GRAVIMETRIC ANALYSIS OFLIGNIN BLENDED WITH TRIGLYCIDYL ISOCYANURATE

The thermal behaviour of lignin blended with triglycidyl isocyanurate (TGI) was investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) over a range of lignin contents from 0 to 85 wt.-%. DSC thermograms of lignin/TGI blends show two exothermic peaks at about 250 and 355 degrees C while TG analysis in nitrogen be ars evidence of a single loss of weight at about 360 degrees C. The fi rst exotherm is suggested to correspond to the heat of bulk reaction b etween epoxy groups of TGI with phenolic hydroxy groups of lignin, and the second one to the heat of char formation of lignin. TG and infrar ed analyses suport this conclusion.