*2.6. Differential Scanning Calorimetry (DSC)*

The thermal characteristics of PoS and PoS-PPC samples were measured with DSC (7000X, HITACHI, Japan) on the basis of He et al. [25] and Xu et al. [26]. Some parameters were achieved from the DSC curves, including the onset (To), peak (Tp), conclusion temperature (Tc), gelatinization (Δ*Hg*), and retrogradation enthalpy (Δ*Hr*). Finally, the retrogradation degree *R* (Δ*Hr*/Δ*Hg*) was computed on account of previous research [27].
