DSC was performed on a Mettler Toledo DSC1. The measurement was carried out with a 50 mL min -1 flow rate of nitrogen, heating the samples from -50 to 100 °C with a heating rate of 10 °C min -1 . The following cooling was performed with the same rate from 100 to -50 °C. For each sample, two heating and two cooling cycles were performed, with a 5-minute isotherm at the end of each cycle. The EFA and PEFA were tested in 100 µL aluminum cups while the PEFA film was cut into small pieces and tested in 40 µL aluminum cups. In both cases, the cups were sealed with a punched aluminum lid. For each sample type, duplicates were tested.