Journal
IONICS
Volume 23, Issue 1, Pages 87-94Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-016-1805-z
Keywords
Poly(ether ether nitrile)s; Cross-linked; Methanol permeability; Selectivity
Funding
- National Natural Science Foundation of China [51373028, 51403029]
- 863 National Major Program of High Technology [2012AA03A212]
- South Wisdom Valley Innovative Research Team Program
- Ningbo Major Science and Technology Research Plan [2013B06011]
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In order to reduce water uptake, swelling ratio, and methanol permeability in sulfonated proton exchange membranes (PEM), novel-sulfonated aromatic poly(ether ether nitrile)s-bearing pendant propenyl groups had been synthesized by direct copolymerization method. All the results showed that the propenyl groups were suitable cross-linkable groups, and that this method was an effective way to overcome the drawbacks of sulfonated polymers at high ion exchange capacity (IEC) values. By cross-linking, the water uptake, swelling ratio, and methanol diffusion could be restricted owing to the formation of compact network structure. For example, CSPEN-60 membranes showed the proton conductivity of 0.072 S cm(-1) at 80 A degrees C, while the swelling ratios and water uptake (17.9 and 60.7 %) were much lower than that of the SPEN-60 membrane (60.8 and 295.2 %). Meanwhile, a 1.1 x 10(-7) cm(2) s(-1) of methanol diffusion was obtained which was much lower than that of Nafion 117 (14.1 x 10(-7) cm(2) s(-1)). Although the proton conductivity of the CSPEN-60 membranes is lower than that of the SPEN-60 membrane, the selectivity is much higher. The CSPEN-60 membrane exhibited the highest selectivity among the tested membranes, about 5.8 times higher compared with that of Nafion117.
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