The surface wettability of the copolymers was determined using water contact angle. The measurement was carried out according to European Standard EN 828 using goniometer Krüss DSA 100 Drop Shape Analyzer. The dried film of the sample (with clean surface) was prepared and a droplet of 2 µL ultra-pure deionized water was slowly dripped on the surface of the sample and after 1 min, the picture of the sessile drop onto the surface of the copolymers was taken using a macro lens. The contact angle was determined by measuring 2 angles for each drop (left and right) from 5 separated sissle drops for each copolymer.