Preparation and characterization of proton exchange membranes based on semi-interpenetrating sulfonated poly(imide-siloxane)/ epoxy polymer networks

摘要

We prepared and characterized a series of semi-lPN (semi-interpenetrating polymer network) membranes based on SP1SX-EP (sulfonated polyimide-siloxane and epoxy) polymers and compared their properties with those of a pure SPISX membrane and a commercially available proton exchange membrane. Overall, the SPISX5-EP (with 5 wt% PDMS (α,ω-diaminopropyl polydimethylsiloxane) in SPISX) membranes can be exhibited desirable mechanical properties and thermal stabilities, with proton conductivities superior to those of Nafion~® 117 at 80 ℃. The dimensional changes of the membranes and degrees of methanol transport decreased with increasing epoxy content; here, the effect of crosslinking had a greater effect than did the increased number of ionic exchange sites. The proton conductivities and methanol permeabilities of the membranes ranged from 10~(-3) to 10~(-2) S/cm and from 10~(-9) to 10~(-7) cm~2/s, respectively, in the temperature range 25-90℃. Transmission electron microscopy images indicated that the presence of large, well-connected hydrophilic domains was responsible for the large hydrolytic stability of the SPISX5-EP membranes; infrared spectroscopy confirmed these results. SPISX5-EP membranes featuring epoxy compositions of 30 and 40% exhibited greater hydrolytic stability relative to the corresponding SPISX membranes, suggesting their potential application as proton-conducting membranes in fuel cells.