Abstract
Lubrication properties of three polyelectrolytes such as Na-poly(acrylate), Na-chondroitin sulphate, and Na-hyaluronate were studied by measuring the static friction coefficient μs of thin liquid films of these aqueous polyelectrolyte solutions between glass surfaces. Adsorption isotherms of the polyelectrolytes onto the glass surface were also measured. Thin liquid films of polyelectrolyte solutions with added NaCl definitely show lubricity. The μs vs. bulk concentration curves have relevance to the adsorption isotherm and lead to the conclusion that the adsorbed polyelectrolyte layer has the ability to reduce the μs value of glass-water-glass interface to the extent of 40–60%. Among the polyelectrolytes tested, Na-hyaluronate has the lowest μs owing to that this polyelectrolyte is used in the animal joints as the lubricant.
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Takahashi, A., Kozaki, N. Adsorption Enhanced Lubrication by Thin Liquid Films of Synthetic and Biological Polyelectrolyte Solutions. Polym J 19, 945–949 (1987). https://doi.org/10.1295/polymj.19.945
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DOI: https://doi.org/10.1295/polymj.19.945