fig7
Figure 7. Cross-section morphologies of the PES/SPEEK membranes. Reprinted from Ref.[72]. In PX, X denotes the content of sulfonated poly(ether ether ketone) (SPEEK) in the polymer matrix; for instance, the P20 contains 20 wt% SPEEK. PX-1 and PX-2 show PX at different magnifications. The scale bars for PX, PX-1, and PX-2 are 10 μm, 1 μm, and 100 nm, respectively.
