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A new crosslinked sulfonated polystyrene for proton exchange fuel cell membrane

¹ College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
² College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen, 518060, China
³ School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai,200240, China.

^* To whom correspondence should be addressed. E-mail: rongguan{at}hubu.edu.cn.

	Abstract

A series of crosslinked sulfonated polystyrene (SPS) membranes with different degree of sulfonation (DS) were prepared in the presence of phosphorous pentoxide-methanesulfonic acid (PPMA) in the ratio of 1:10 by weight via the condensation reaction between the sulfonic acid groups and the activated hydrogen atoms of SPS. The crosslinking reaction was confirmed by ¹H-NMR and Fourier transform infrared spectrometry. In comparison with uncrosslinked SPS membrane, the crosslinked one showed much higher thermal stability as the degradation temperature increased from about 200 to 300 °C, lower but enough ion exchange capacity (IEC), lower water uptake, and lower swelling ratio. Moreover, the crosslinked SPS membranes still maintained high proton conductivity (3.3–6.1 x 10^–2 S cm^–1) and keep good shape at room temperature in 100% relative humidity. The relationships among crosslinking time, crosslinking ratio, DS and membrane properties are discussed.

First published on August 11, 2009
High Performance Polymers 2009, doi:10.1177/0954008309105515


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