Separation sulfonate-group-containing

The changes of the C02 permeability and separation factor for C02/CH4, compared to the typical values of PPO standard are shown in Table II for PPO modified with different sulfonyl groups. The best enhancement was obtained for PPO containing phenyl sulfone groups. 

We have reported previously the sulfonation of a polypentenamer (PP) under reaction conditions that preclude the formation of covalent cross-links (J). The sulfonated materials are isolated in the form of sodium salts to give ion-containing elastomers. The thermal and dynamic mechanical properties of the sulfonated PP s indicate the existence of phase-separated ionic clusters above a sulfonate concentration of roughly 10 mol % (2). It has been shown (J) that the unsaturation in the sulfonated PP s can be removed by a diimide hydrogenation reaction to yield a material that is essentially linear polyethylene with pendant sulfonate groups. In this manner the effect of backbone crystallinity on... 

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