A Nuclear Magnetic Resonance Study of Water Behavior in PTFE Ionomer Membranes

High field 1H nuclear magnetic resonance has been conducted to investigate the ionic motion in perfluorinated ionomer membranes from Dow Chemical (XUS). Two distinctive proton resonance peaks were found in the vacuum‐dried samples. The designation of the upfield peak to the 1Hs associated with the sulfonate groups was proved by the fact that the intensity of the low‐field peak increases drastically in the less‐dried specimens. An asymmetrical …