Abstract
Contact angle measurements for water, glycerol, formamide, ethylene glycol, diiodomethane, α-bromonaphthalene, tricresyl phosphate, dimethylsulfoxide (DMSO), and bromoform on polymethyl methacrylate (PMMA) covered with adsorptive and gelatinized gelatin films were made. Adsorption was performed from solutions in the 0−25 g/L concentration range. A gelatinized gelatin film was created from solutions of 40−100 g/L concentrations. It was found that the biggest changes of the contact angles were up to monolayer coverage of the PMMA surface. For all liquids (besides water) the contact angle was almost constant above the gelatin concentration 50 g/L. Very high contact angles (∼134°) were obtained for water on a gelatinized gelatin film obtained from a solution of 100 g/L concentration. From the obtained contact angles, the Lifshitz−van der Waals components and the values of the electron−acceptor and electron−donor parameters of the acid−base components of the films were calculated for the glycerol−ethylene glyc...
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