First, 40 mg of EFA was placed in a Teflon dish and treated at 150 °C for 3 hours and 15 minutes in air (UF260 Memmert universal oven, USA) to induce the self-esterification of the EFA monomer. Once cooled, the self-esterified EFA (PEFA) sample was removed from the Teflon dish and stored at room temperature before further processing. The PEFA film was, subsequently, obtained through a compression molding process using a Fontijne Press (TP 400, Netherlands). A 40 μm stainless steel mold was chosen to obtain a circular film with a 3 cm diameter. The PEFA was sandwiched between two steel distancing plates covered with Teflon sheets before pressing. The set-up was pre-heated at 150 °C for 5 minutes under 20 kN of force to ensure that the distancing plates would reach the set temperature and melt the sample. Then, 150 kN of force at the same temperature was applied for 10 minutes. A preliminary study indicated that shorter times did not efficiently mold the samples, while no relevant effect on the polymerization was noticed for higher pressures. The temperature was kept as the same of the initial melt-polycondensation process. The pressed sample was left in the mold for 5 days before it was possible to peel off one of the Teflon sheets without affecting the film. The PEFA film, still on one of the Teflon sheets was cured at 150 °C for 10 h in air. The removal of the sample was carefully carried out by peeling it from the Teflon sheet. The process yielded films with a thickness of 31 ± 5 μm, as average over 5 samples, measured at 5 different positions for each.