3.3. Differential scanning calorimetry (DSC)
Thermal stability studies on lignin extracted from various fibers considered in this study were carried out through DSC where heat of reaction was measured. Enthalpy measurements obtained from DSC was observed to be higher for lignin from flax fiber and alfalfa at 190.57 and 160.90 J/g, respectively as seen in Fig. 4 and Table 2. This suggests that more energy is required to break down the bonds in these lignin compositions yielding a more stable and flame retardant material.