Sulfonated Cross-Linked Poly(ether ether ketone) Films with Wrinkled Structures: Preparation and Vanadium Ions Permeability

Wrinkling patterns were fabricated by sulfonation of ion irradiated poly(ether ether ketone) (PEEK). A variety of wrinkling patterns in the micrometer to sub-micrometer range were observed and were controlled by the adsorbed dose and dose rate of the irradiated ions as well as the sulfonation time. Because of the properties of these micro-textured membranes, they are promising for a broad range of applications. In particular, the cross-linked membranes had a very low permeability of vanadium ions, i.e. 1.5 × 10 −7 cm 2 min −1 due to their wrinkled structures in combination with the Donnan exclusive effect.