Abstract
Quaternary ammonium functionalized poly(arylene ether ketone)s (QA-PAEKs) with mass-based ion exchange capacities (IECg) ranging from 1.12 to 2.88 mequiv g–1 were synthesized via condensation polymerization of a newly designed highly benzylmethylated bisphenol, subsequent bromination of the benzylmethyl groups, and then quaternization with trimethylamine. The quaternary ammonium groups were densely and selectively anchored on the bis(3,5-dimethyl-4-hydroxyphenyl)-3,5-dimethylphenylmethane residues in the QA-PAEK backbone. 1H and 13C nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) were used to confirm the chemical structure of the samples. The morphology, mechanical properties, thermal stabilities, water uptake, swelling ratio, and bromide (Br–) conductivity of the QA-PAEK membranes were investigated. It was found that QA-PAEK samples had much higher Br– conductivity than a randomly functionalized quaternary ammonium ...
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