Crosslinked polytriazole membranes for organophilic filtration

Abstract

We report the preparation of crosslinked membranes for organophilic filtration, by reacting a new polytriazole with free OH groups, using non-toxic poly (ethylene glycol) diglycidyl ether (PEGDE). The OH-functionalized polymer was obtained by converting the oxadiazole to triazole rings with high yield (98%). The maximum degree of crosslinking is achieved after 6 h of reaction. The crosslinked polytriazole membranes are stable in a wide range of organic solvents and show high creep recovery, indicating the robustness of crosslinked membranes. The influence of different casting solutions and different crosslinking time on the membrane morphology and membrane performance was investigated. The membranes performance was studied in dimethylformamide (DMF) and (tetrahydrofuran) THF. We achieved a permeance for THF of 49 L m-2 h-1 bar-1 for membranes with molecular weight cut off (MWCO) of 7 kg mol-1 and a permeance for THF of 17.5 L m-2 h-1 bar-1 for membranes with the pore dimensions of the membranes to have a MWCO, which covers ultra-and nanofiltration range.

Cellulose hollow fibers for organic resistant nanofiltration

“…The development of solvent resistant membranes is growing fast, using materials such as poly(ether ether ketone) (PEEK) [51,52], polyimide (PI) [53][54][55], polybenzimidazole (PBI) [56,57] and polytriazole (PTA) [58,59]. In most cases, the solvent resistance is only achieved by crosslinking.…”

Post modification of acetylene functional poly(oxindole biphenylylene) by photoinduced CuAAC

“…Cross-linked polyimide, polybenzimidazole and polyetherketone are some of the high-performance materials being used for membranes with solvent stability [4][5][6][7]. We have been focusing on polytriazoles [8,9] poly(oxindolebiphenylylene) [10] (POXI), polymers with exceptional thermal stability, which extend the window of application of polymeric membranes to conditions currently only covered by ceramic analogues.…”

Molecular sieving using metal–polymer coordination membranes in organic media

“…To obtain solvent-resistant membranes, crosslinking is commonly required, usually by immersing membranes in a solution of reactive crosslinking agents, such as dibromoxylene, 6 bisepoxide, 7 triethylenetetramine, 8 diamine, 9 and acyl chloride. 10 Metal derivatives, 11,12 thermal rearrangement processes, 13,14 and interpenetrating polymer networks, 15 have recently been proposed for improving the stability of membranes.…”