Fig. 3: Water uptake of ionomer films.

Water uptake measurements of ionomer films (~40-µm thick) dried at four RH conditions; recorded at 20 °C, 50 °C, and 80 °C. Note that the 50 °C and 80 °C points overlap at 40% RH.

Water uptake measurements of ionomer films (~40-µm thick) dried at four RH conditions; recorded at 20 °C, 50 °C, and 80 °C. Note that the 50 °C and 80 °C points overlap at 40% RH.