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Water contact angle measurement
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Water contact angles on polymer films were measured with Contact Angle Meter SL200B (Solon Tech. Co., Ltd.) by the dynamic sessile drop method. The polymer was melted and pressed at about 150 °C, 5 MPa for 5 min to obtain a polymer film for testing. The water contact angles of the polymer thin films were measured using a contact angle goniometer at 25 °C with an accuracy of ±3°. The reported values are the average of at least three measurements made at different positions of the film.
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