Journal
SOLID STATE IONICS
Volume 351, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2020.115325
Keywords
Sulfonated poly(arylene ether nitrile); Proton exchange membranes; Cross-linked; Selectivity
Categories
Funding
- National Key Research and Development Program of China [2018YFC0809500]
- National Natural Science Foundation of China [U1633203, U1733126]
- Sichuan Science and Technology Program [2018GZYZF0069]
- General Program of Civil Aviation Flight University of China [J2020-111]
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As we all know, introducing crosslinking groups into the polymer chain can effectively improve the overall performance of proton exchange membranes, which are for the formation of intermolecular three-dimensional network. In this work, side-chain nitrile-based cross-linked sulfonated poly(arylene ether nitrile) (SPEN) membrane is expected to be an ideal material for preparing proton exchange membranes (PEMs). A series of SPEN-60-COOH-x with different carboxyl content have been synthesized through fixing the content of sulfonic group at 60% in the experiment and changing the molar fraction of phenolphthalein (PPL). Then, the SPEN-60-CN-x were prepared by grafting nitrile groups onto the SPEN-60-COOH-x via carboxyl groups. NMR and FTIR were used to characterize the construction of polymers. The TGA results showed that the thermal stability of CSPEN-60-CN-x was significantly improved by the cross-linking network structure formed by side chain nitrile groups. As the degree of cross-linking increases, the water uptake of CSPEN-60-CN-x membranes showed a downward trend. The results also indicated that the dimension stability of CSPEN-60-CN-x membranes was effectively improved by cross-linking reaction, and the dimension stability of CSPEN-60-CN-x membranes was further improved by increasing the content of nitrile groups. The selectivity of CSPEN-60-CN-x membranes increased significantly after crosslinking. CSPEN-60-CN-30 has the highest selectivity of 5.37 x 10(5) S.s.cm(-3) among all the membranes, about 11.9 times that of Nafion 117.
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