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Bumenn, Edwin
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article
Ionic liquid-based semi-interpenetrating polymer network (sIPN) membranes for CO2 separation
Abstract
<p>This work explores the preparation of ionic liquid (IL)-based semi-interpenetrating polymer network (sIPN) membranes composed of poly(ethylene oxide) (PEO) network and linear nitrile butadiene rubber (NBR), incorporating up to 66 wt% of three ILs with a common cation ([C<sub>2</sub>mim]<sup>+</sup>) and different anions ([C(CN)<sub>3</sub>]<sup>–</sup>, [NTf<sub>2</sub>]<sup>–</sup> and [FSI]<sup>–</sup>). All sIPN/IL membranes were characterized by Fourier-transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and puncture tests. Ideal CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/H<sub>2</sub> separation performances of the prepared sIPN/IL membranes were investigated at T = 20 °C and 35 °C, respectively, and 1 bar of feed pressure. The incorporation of both [C<sub>2</sub>mim][NTf<sub>2</sub>] and [C<sub>2</sub>mim][FSI] ILs allowed to obtain sIPN/IL membranes with higher IL contents (66 wt%) compared to previously reported PIL–IL membranes with similar IL structures (40 wt%). The membranes containing [NTf<sub>2</sub>]<sup>–</sup> and [C(CN)<sub>3</sub>]<sup>–</sup> anions showed improved thermal stability compared to the neat PEO/NBR sIPN, being thermally stable up to 300 °C. Although sIPN/IL membrane mechanical properties were affected by the incorporation of IL, all membranes revealed high elongation properties (elongation upon puncture = 68–170%), mainly due to the presence of NBR component in the sIPN structure. The highest CO<sub>2</sub>/N<sub>2</sub> permselectivity was obtained for the sIPN/66 wt% [C<sub>2</sub>mim][C(CN)<sub>3</sub>] membrane, while the sIPN/66 wt% [C<sub>2</sub>mim][FSI] membrane revealed the highest CO<sub>2</sub> and N<sub>2</sub> permeabilities. The incorporation of 66 wt% of [C<sub>2</sub>mim][FSI] into the sIPN also showed superior CO<sub>2</sub>/H<sub>2</sub> separation performance, with a CO<sub>2</sub> permeability of 727 Barrer and a CO<sub>2</sub>/H<sub>2</sub> permselectivity of 10.9.</p>