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

Table 2

Mechanical properties of different semi-IPN membranes before and after phosphoric acid doping.

Membrane	Tensile strength (MPa)		Elongation at break (%)
	PA undoped	PA doped	PA undoped	PA doped
PEI-ER(1 : 2)/PBI	60	4.2	8.6	14
PEI-ER(2 : 3)/PBI	49	2.2	8.0	4.4
PEI-ER(1 : 1)/PBI	37	1.4	18	1.4
PEI-ER(3 : 2)/PBI^a	22	—	43	—
PEI-ER(2 : 1)/PBI^a	13	—	98	—

^aThese membranes swelled significantly in PA solution.