The moisture uptake of the PEFA film was evaluated at 50 % RH and room temperature after 48 hours of conditioning, in a controlled humidity room. The percentage of water uptake was computed with respect to the dry weight of the film (𝑚𝑚 𝑑𝑑𝑑𝑑𝑑𝑑 ), measured after 48 h of conditioning in a desiccator equipped with an electronic dehumidification system.