2.8. Differential scanning calorimetry (DSC) The thermal properties (5e6 mg, respectively) were tested by DSC (Netzsch DSC-204F1). The crystallization and melting behavior were detected by two heating scans and a cooling scan in the range of 0e190 C at a heating rate of 10 C/min. Glass transition temperature (Tg) was estimated from the inflection of the glass transition based on the second scan. Cold crystallization temperature (Tc) and melting temperature (Tm) were determined by the maximum value of the DSC exo/endotherm peak. Crystallinity (c) was calculated by the following formula: