Highly cross-linked polyether-based 1,2,3-triazolium ion conducting membranes with enhanced gas separation properties

Abstract

International audienceA series of cross-linked polyether-based 1,2,3-triazolium ion conducting membranes are prepared via the combination of thermally promoted Huisgen 1,3-dipolar cycloaddition of a dialkyne and a diazide poly(trimethylene ether glycol) monomers with in-situ N-alkylation of the resulting poly(1,2,3-triazole)s with varying contents of 1,10-diiododecane as cross-linking agent. The resulting free-standing membranes have T(g)s below -60 degrees C, T(d)s up to 230 degrees C, and Young's modulus up to 4.2 MPa. The overall combined reaction kinetics were studied by DSC yielding an activation energy of 76 kJ/mol by the Kissinger method. These ion conducting membranes have conductivities up to 10(-6) S/cm at 30 degrees C under anhydrous conditions. They have potential to be used in CO2 separation applications as they exhibit CO2 permeability of 59-110 Barrer and CO2/N-2 selectivity of 25-48

Influence of Anion and Crosslink Density on the Ionic Conductivity of 1,2,3‐Triazolium‐Based Poly(ionic liquid) Polyester Networks

“…A comparison plot of log σ (S cm −1 ) versus 1000/ T (K −1 ) which investigates the various anions used, given a constant 1.5:1.0 acrylate:acetoacetate monomer ratio, is shown in Figure . Overall, the PIL networks were found to have promising ionic conductivities (10 −6 to 10 −8 S cm −1 at 25 °C; Table 5 ), especially when compared to previously reported 1,2,3‐triazolium PILs (networks and non‐networks) . The conductivities for the previously reported PILs mentioned herein were measured under either anhydrous or low humidity (≤10% RH) conditions.…”

“…Such a strategy has been reviewed by Obadia and Drockenmuller and efforts in this area have ranged from the synthesis and chain‐growth polymerization of 1,2,3‐triazolium‐containing (meth)acrylic monomers to a more direct approach in the step‐growth polyaddition of azides and alkynes. Pertinent to this study, crosslinked polyether‐based 1,2,3‐triazolium PIL membranes were synthesized by Zhou et al in order to test their conductive and gas separation properties . The PIL networks exhibited conductivities of up to 10 −6 S cm −1 at 30 °C under anhydrous conditions and CO 2 permeability values of 59–110 Barrer with a CO 2 /N 2 selectivity of 25–48.…”

Development of ethanolamine‐based ionic liquid membranes for efficient CO2/CH4 separation

“…and where J denote flux of gasses, Δ P is change in pressure across the membrane and l is the membrane thickness. The gas permeance unit used is (GPU) gas permeation unit, 1 GPU is equal to 10 −6 cm 3 cm(STP)/cm 2 s cmHg . While selectivity of CO 2 /CH 4 was calculated by taking the ratios of CO 2 and CH 4 permeance …”

Progress on Catalytic Systems Used in Click Polymerization

“…Although the supported Cu(I) catalytic strategy can greatly decrease the copper residue contents, nevertheless, they cannot completely surmount the disadvantages of transition‐metal residues. Thermally accelerated azide‐alkyne polycycloaddition is free from this problem and could yield useful polymeric materials with interesting properties . However, its regioselectivity should be further enhanced.…”