Semi-interpenetrating Network Membrane from Polyethyleneimine-Epoxy Resin and Polybenzimidazole for HT-PEM Fuel Cells

Figure 3

Gel fraction test of PEI-ER/PBI membranes performed in NMP at 80°C for 12 h. (a) The membrane samples in NMP at 80°C after 12 h and (b) the residual weight of the membranes after solvent treatment.

(a)

(b)