Figure 3

(a) SEM photographs showing the surface of CPEEK, sulfonated PEEK, and CPEEK-AN. (b) Characterization of pores formed on the sulfonated PEEK.
(a) SEM photographs showing the surface of CPEEK, sulfonated PEEK, and CPEEK-AN. (b) Characterization of pores formed on the sulfonated PEEK.