Surface friction of hydrogels

The sliding friction of various kinds of hydrogels has been studied and it was found that the frictional behaviors of the hydrogels do not conform to Amonton's law F=μW, which well describes the friction of solids. The frictional force and its dependencies on the load are quite different depend...

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Bibliographic Details
Published inProceedings of the Japan Academy, Series B Vol. 75; no. 6; pp. 122 - 126
Main Authors GONG, Jian Ping, IWASAKI, Yoshiyuki, KAGATA, Go, OSADA, Yoshihito
Format Journal Article
LanguageEnglish
Published The Japan Academy 1999
Subjects
adhesion
attraction
coefficient of friction
friction
hydrodynamic lubrication
interfacial interaction
Polymer gel
repulsion
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Summary:The sliding friction of various kinds of hydrogels has been studied and it was found that the frictional behaviors of the hydrogels do not conform to Amonton's law F=μW, which well describes the friction of solids. The frictional force and its dependencies on the load are quite different depending on the chemical structures of the gels, surface properties of the opposing substrates, and the measurement condition. The gel friction is explained in terms of interfacial interaction, either attractive or repulsive, between the polymer chain and the solid surface. According to this model, the frictional force is ascribed to the viscous flow of solvent at the interface in the repulsive case. In the attractive case, the force to detach the adsorbing chain from the substrate appears as friction. Surface adhesion between glass particles and gels measured by AFM showed a good correlation with the friction, which support the repulsion-adsorption model proposed by authors.
ISSN:0386-2208
1349-2896
DOI:10.2183/pjab.75.122