• Clean Technology
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• v.10 no.3
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• pp.169-176
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• 2004

Sulfonated ionomer membranes, sulfonated poly(ether ether)ketone (SPEEK)-$AgNO_3$, were prepared and tested for separation of the isoprene/n-pentane mixtures. The facilitated transport membranes showed good selectivity and permeance of isoprene over n-pentane and long-term stability. Depending on various reaction conditions, the degree of sulfonation (DS) of SPEEK was measured by 1H NMR spectroscopy and the performance of the membranes was affected by the DS of SPEEK as a whole. As the DS of SPEEK was increased, the selectivity of isoprene over n-pentane increased and eventually reached a maximum selectivity of 850 ~ 900 and the stability of that was continued more than 100 h.