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Effect of Solvent Quality on the Friction Forces Between Polymer Brushes

Published online by Cambridge University Press:  17 March 2011

Aaron M. Forster  and
S. Michael Kilbey II
Aaron M. Forster
Affiliation:
Department of Chemical EngineeringClemson UniversityClemson, SC 29634
S. Michael Kilbey II
Affiliation:
Department of Chemical EngineeringClemson UniversityClemson, SC 29634
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Abstract

We have used the surface forces apparatus to measure the structural and frictional force profiles between opposing, solvated brush layers as a function of temperature. Two different polyvinylpyridine-polystyrene [PVP-PS] diblock copolymers were used to make PS brushes. The molecular weights (in thousands) of these PVP-PS materials were [114/103]k, [30/70]k, respectively. Structural and frictional force profiles in toluene and cyclohexane were measured, and the cyclohexane experiments were conducted at temperatures ranging from the theta-point to 50°C. In toluene the PS brushes needed to be compressed to ∼1/5th of their equilibrium height before frictional forces were measured, but this onset of frictional forces was detected at a much lower level of compression in near-theta cyclohexane. In cyclohexane the structural force profiles were basically insensitive to the temperature change, but the frictional forces depended strongly on the solvent temperature. When the cyclohexane temperature was raised, the onset of frictional forces decreased toward the good-solvent onset. We also discuss the dependence of frictional force on shearing parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 710: Symposia DD – Polymer Interfaces and Thin Films , 2001 , DD11.6.1/AA10.6.1
Copyright
Copyright © Materials Research Society 2002

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