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Studies on novel heat treated sulfonated poly(ether ether ketone) [SPEEK]/diol membranes for fuel cell applications

โœ Scribed by Deeksha Gupta; Veena Choudhary

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
974 KB
Volume
36
Category
Article
ISSN
0360-3199

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โœฆ Synopsis

The paper describes the preparation of membranes based on sulfonated poly(ether ether ketone) [SPEEK] [degree of sulfonation w65%] in the presence of varying amounts of poly (ethylene glycol) (molecular weight 200) and cyclohexane dimethanol [CDM] using water:ethanol (50:50) as solvent. After drying, the membranes were heat treated at 60 C (2 h), 80 C (2 h), 100 C (2 h), 120 C (2 h) and 135 C for 16 h. After the heat treatment, samples were insoluble in water:ethanol (50:50) mixture. The membranes thus obtained were characterized by FTIR spectroscopy (structural), water uptake (hydrolytic stability), thermal stability (TG), mechanical stability and proton conductivity. A significant increase in the hydrolytic stability was observed, SPEEK became elastic and fragile whereas the heat-treated SPEEK/PEG and SPEEK/CDM remained stable even after 135 days of water immersion at 35 C.

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In the present study, polyelectrolyte membranes based on partially sulfonated poly(ether ether ketone) (sPEEK) with various degrees of sulfonation are prepared. The optimum degree of sulfonation is determined according to the transport properties and hydrolytic stability of the membranes. Subsequent