Abstract
The streaming potentials of several sorts of polyethylene were determined as a function of pH and composition of aqueous solutions and the electrokinetic (zeta) potentials were calculated. The results were compared with the electrokinetic properties of glass and polystyrene. It has been found that H+ and OH− ions are potential-determining on polyethylene. The surface of polyethylene is charged negatively above pH 2.5, probably due to dissociation of carboxyl groups, contained on polyethylene as a result of its oxidation during its polymerization and/or further processing. The zeta potentials depend in a rather complicated way on the concentration of various 1∶1 inorganic electrolytes. The probable interpretation of this dependence has been given and conclusion was derived about the absence of compact adhered layer of water molecules at the surface of polyethylene. The results of the present work may be of some importance for elucidating the adsorption properties of polyethylene.
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