Imidazolium-functionalized polysulfone

Fig. 6.14 Structure of the imidazolium-functionalized polysulfone (Reproduced from [221] with permission)...

Imidazolium-functionalized polysulfone anion exchange membranes have been synthesized by reaction of choloromethylated polysulfone and 1-methyl-imidazole [221], yielding to the stmcture shown in Fig. 6.14. 

Yan X, He G, Gu S, Wu X, Du L, Wang Y (2012) Imidazolium-functionalized polysulfone hydroxide exchange membranes for potential applications in alkaline membrane direct alcohol fuel cells. Int J Hydrogen Energ 37 5216-5224... 

Zhang, F. Zhang, H. Qu, C., Imidazolium functionalized polysulfone anion exchange membrane for fuel cell apphcation. Journal of Materials Chemistry 2011, 2/(34), 12744. 

Tris (2,4,6-trimethoxyphenyl) benzyl phosphonium hydroxide shows the highest basicity ever reported. Its HEM has the highest specific hydroxide conductivity among all reported cationic functional group-based HEMs, typically about twice that of trimethyl benzyl ammonium and more than foiu- times that of methyl imidazolium (39 [5], 19 [31], and 8.4mSgcm mmor [32] respectively, with the same polysulfone polymer matrix and homogeneous membrane structure in each case) (Table 6.2). 

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