The glass transition temperature (Tg) values of the lignin samples are shown in Figure 4 and Table 6. Among all samples, Tg of the dichloromethane-soluble lignin was the lowest (about 80°C). Apart from the dichloromethane- soluble lignin, there was no significant difference among the Tg values of the lignin samples. The results associated well with their MW values and were also in agreement with other studies that reported Tg values between 90 and 180°C (Tejado et al., 2007; Garcia et al., 2009).