Abstract
Chloromethylated PEEK (CMPEEK) was successfully synthesized for the first time by concentrated sulfuric acid as the solvent and its degree of chloromethylation (DC) was controlled (38–98%) by varying the chloromethylation time. The sulfonation of PEEK was confirmed to be negligible during the chloromethylation by 1H NMR analysis. CMPEEKs are soluble in high-boiling-point solvents, which makes it possible to prepare CMPEEK membranes. Subsequently, it was quaternized and ion-exchanged by NaOH to form quaternized PEEK hydroxide (QAPEEKOH) membrane. The ion exchange capacity of QAPEEKOH membranes ranges from 0.43 to 1.35 mmol g −1, and the corresponding degree of quaternization of chloromethyl group increases from 35% to 61%. QAPEEKOH membranes from DC of 38–70% have appropriate water uptake (≤145%) and moderate swelling ratio (≤27%) even at 60 °C. More importantly, their hydroxide conductivities, such as 12 mS cm −1 at 30 °C and 0.95 mmol g −1 of IEC, are higher than those of most other quaternized aromatic polymer membranes. TGA shows that QAPEEKOH has high thermal stability ( T OD: 148 °C). All the above properties indicate that QAPEEKOH membrane is very promising for the potential application in hydroxide exchange membrane fuel cells.
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