Preparation and Characterization of Tetra-Imidazolium Hydroxide Polyphenylene Membranes via Nickel Catalyzed C–C Coupling Polymerization

Hohyoun Jang, Soonho Lee, Jaeseong Ha, Kunyoung Choi, Taewook Ryu, Kyunghwan Kim, Heung-Seok Jeon, Whangi Kim
2016 Energies  
Imidazolium hydroxide anion exchange membranes functionalized with conjugated tetraphenylethylene moieties were synthesized via Ni(0) catalyzed polymerization by sequential chloromethylation, substitution with imidazoliums and ion exchange. Moreover, with their pendant benzoyl groups the copolymers showed high molecular weight, durability, thermo-oxidative stability, high solubility in polar aprotic solvents and strong chemical and thermal stability in comparison to alkyl quaternary
more » ... ctionalized polymers. The proposed polymer membranes, without ether linkages, demonstrated improved performance in ion exchange capacity, water uptake, ion conductivity, and thermal stability. The polymer membranes were studied by 1 H-NMR (Nuclear Magnetic Resonance) spectroscopy, thermogravimetric analysis, water uptake, ion exchange capacity and ion conductivity. Surface morphologies were assessed by atomic force microscope (AFM). The synthesized polymers may have applications as fuel cell membranes because of their excellent ion conductivity. Figure 7. The chemical stability of tetra-imidazolium hydroxide polymer membranes PTPEDBP-I/OH 10 and PTPEDBP-I/OH 20 after immersion in 1.0 M KOH solution at 60˝C: ion conductivity at 80˝C and 100% relative humidity.
doi:10.3390/en9040271 fatcat:dckmf6snujbk5kmzrjhpqhdcka