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Effect of Gastrodin content on the hydrophilicity of Gastrodin/PU films. (A) Water contact angles of various Gastrodin/PU films at desired time points (5, 10, 15, 20 and 25 s). (B) Initial contact angles. (C) The swelling ratio of specimens. (Error bars represent standard deviation from the mean (n = 5). *p < 0.05; ns: no significant difference.).
