Preparation of composite anion exchange membranes based on in‐situ copolymerization of N‐vinyl formamide and divinylbenzene in porous PTFE

Abstract

A series of composite anion exchange membranes was synthesized via in-situ copolymerization of various ratios N-vinyl formamide (NVF) and divinylbenzene (DVB), supported by porous polytetrafluoroethylene (PTFE) polymer matrix, and followed by alkaline hydrolysis, and quaternization of the composite membranes with epoxypropyltrimethylammonium chloride (EPTMAC). FTIR and SEM analyses revealed that the composite membranes were successfully prepared. Moreover, the hydrophilic property of the composite membrane improved by introduction of the quaternized poly(NVF-co-DVB) copolymer. Water uptake, swelling ratio, and conductivity showed upward trends by increase of NVF amount. The copolymer with 95% of NVF showed the highest elongation at break (102%, room temperature) and conductivity (5.15 × 10 −2 S/cm, 80 C). After immersion of the PNDB 95%-N membrane in 5 mol/L NaOH solution for 96 h at room temperature, the conductivity (60 C) of the membrane decreased to 3.99 × 10 −2 S/cm. Moreover, the membrane registered weight loss under 4.5%, caused by degradation of the quaternary ammonium groups in NaOH solution. All in all, in 3 mol/L methanol solutions, the composite membranes showed permeability ranging from 7.6% to 19.7%, if compared to the Nafion ®-115 membrane, showing good alcohol resistance.

Radiation-grafted anion-exchange membranes for reverse electrodialysis: a comparison ofN,N,N′,N′-tetramethylhexane-1,6-diamine crosslinking (amination stage) and divinylbenzene crosslinking (grafting stage)

“…DVB and TMHDA were selected for this study as they are commercially available reagents that can be purchased in bulk quantities and have been used to crosslink a wide variety of IEMs. 11,16,20,21 As can be seen with the data presented in the ESI † involving ETFE-based RG-AEMs made with a selection of commercially available diamines, TMHDA showed the most promise (on a permselectivity evaluation basis).…”

Evaluation of the antiproliferative and oxidative effects of polymeric cryogels on the model eukaryotic yeast Saccharomyces cerevisiae

“…In this paper, we investigated the antiproliferative and oxidative effects of HEMA based cryogels containing different amounts of N-Vinylformamide (NVF) as comonomer on Saccharomyces cerevisiae BY4741 cells, which were previously synthesized and characterized [5]. NVF is a hydrophilic monomer which has stronger reactivity and much lower toxicity than acrylamide [17]. Previously, we have shown that these cryogels are promising candidates for potential articular cartilage biomaterials [18].…”