Experimental study reveals monomer structure regulates carbon dioxide solubility and permeability in ionic liquid resins, highlighting strategies to tailor membrane gas separation.
New imidazolium- and pyrrolidinium-based bis(epoxide)-functionalized ionic liquid (IL) monomers were synthesized and reacted with multifunctional amine monomers to produce cross-linked, epoxy–amine poly(ionic liquid) (PIL) resins and PIL/IL ion-gel membranes. The length and chemical nature (i.e., alkyl versus ether) between the imidazolium group and epoxide groups were studied to determine their effects on CO 2 affinity. The CO 2 uptake (millimoles per gram) of the epoxy–amine resins (between 0.1 and 1 mmol/g) was found to depend predominately on the epoxide-to-amine ratio and the bis(epoxide) IL molecular weight. The effect of using a primary versus a secondary amine-containing multifunctional monomer was also assessed for the resin synthesis. Secondary amines can increase CO 2 permeability but also increase the time required for bis(epoxide) conversion. When either the epoxide or amine monomer structure is changed, the CO 2 solubility and permeability of the resulting PIL resins and ion-gel membranes can be tuned.
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McDanel et al. (2014) studied this question.
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