Thermal and thermomechanical analyses of lignin

A phase shift (φ) is observed between the maximum of DTG peak of the lignin and the maximum of its DTA peak. The phase shift between the cause and the effect is related to the viscosity which results from the internal frictions in the structure. Internal frictions are representative of the thermo-mechanical behavior of the thermally stressed material. Figure 3: DTG and DTA curves of lignin.145