DSC was performed with a PerkinElmer 8500 (Hyper-DSC) equipped with a PerkinElmer Intracooler II under a 20 mL/min N2 purge. Samples in the weight range of 5–20 mg were scanned at 1–50 ◦C/min in aluminum (Al) pans. The temperature and heat flow
were calibrated using indium (In) standard.