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Trend of Sa parameter for the smooth and rough faces of Pebax (M1); Pebax/20IL (M2); Pebax/40IL (M3); Pebax/60IL (M4); Pebax/19.8IL/0.2 × GnP (M5); Pebax/18IL/2 × GnP (M6); Pebax/16IL/4 × GnP (M7); Pebax/32IL/8 × GnP (M8); and Pebax/48IL/12 × GnP (M9)—full names in Table 1.
