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Water contact angle (a) and diiodomethane contact angle (b) of PEKK, PT20 and PT40; Total surface energy (c) of PEKK, PT20 and PT40 by using Owens two-liquid method; Protein adsorption (d) on PEKK, PT20 and PT40 in 5 mg/mL BSA, 30 μg/mL Fn solutions, respectively. (* represents p < 0.05, ** represents p < 0.01, in comparison with PEKK; # represents p < 0.05, PT40 vs PT20).
