Synthesis and Properties of Proton Exchange Membranes Based on Cross-linked Block Sulfonated Poly(arylene ether sulfone)s

doi:10.7503/cjcu20130695

Abstract

Abstract:

In order to improve the proton conductivity and stability of proton exchange membranes based on sulfonated poly(arylene ether sulfone)(SPAES), a series of cross-linked block SPAES membranes(cbSPAES) was prepared. The block SPAES copolymers were synthesized through block copolymerization and subsequently subjected to cross-linking modification in the presence of P₂O₅, where the cross-linking reaction taken place between -SO₃H groups and active hydrogen atoms attached to the polymer backbones. Proton conductivity of the cbSPAES membranes were obtained by electrochemical impedance spectroscopy(EIS), dimensional and hydrolytic stabilities were evaluated by the membrane size changes in the in-plane/through-plane directions and accelerating aging test in water, respectively. The results indicate: (1) cbSPAES membranes have obvious better dimensional and hydrolytic stabilities than SPAES membranes; (2) at the same cross-linking degree, water uptakes and proton conductivities of cbSPAES membranes increase with the increase in repeat units of sulfonated moieties. For example, the membrane of cbSPAES(30/10)-10 exhibits water uptake of 65%, size changes in the in-plane/through-plane directions of 0.16/0.18 and proton conductivity of 163 mS/cm in water at 60 ℃.

Key words: Proton exchange membrane, Poly(arylene ether sulfone), Block, Cross-link

CLC Number:

O631

TrendMD:

TANG Wei-Fen, LING Ying, CHEN Shan-Shan, HU Zhao-Xia, CHEN Shou-Wen. Synthesis and Properties of Proton Exchange Membranes Based on Cross-linked Block Sulfonated Poly(arylene ether sulfone)s[J]. Chem. J. Chinese Universities, 2013, 34(11): 2661.

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Synthesis and Properties of Proton Exchange Membranes Based on Cross-linked Block Sulfonated Poly(arylene ether sulfone)s

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