Behavior of cationic surfactants and short-chain alcohols in mixed surface layers at water-air and polymer-water interfaces with regard to polymer wettability II. Wettability of polymers.

摘要: Abstract The wettability of polytetrafluoroethylene (PTFE) and polymethylmethacrylate (PMMA) by aqueous solutions cetyltrimethylammonium bromide (CTAB) mixtures with short-chain alcohols such as methanol, ethanol, propanol, well for 1-hexadecylpyridinium (CPyB) the same alcohols, was studied on basis advancing contact-angle measurements sessile drop method over a wide range alcohol cationic surfactant concentrations where they can be present in solution monomeric or aggregated form. It should noted that contact angles surfactants propanol PTFE surfaces were measured earlier presented our previous paper. From obtained values relationships between cos  θ surface tension ( γ LV ) adhesion considered. relationship reciprocal also discussed. these critical PMMA wetting correlation adsorption at water–air polymer–water interfaces deduced. On components parameters surfactants, polymers Gibbs Guggenheim–Adam isotherm effective concentration calculated. Next, work to polymer regard monolayer composition analysis allowed us conclude depends only contribution acid–base interactions mixtures, its slightly solution, contrast PMMA. is close determined liquids which two times more higher than PTFE, but it considerably lower even Lifshitz–van der Waals component this tension.