Publication
The Journal of Chemical Physics
Paper

A reevaluation of forces measured across thin polymer films: Nonequillibrium and pinning effects

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Abstract

We have measured forces between molecularly smooth solid surfaces separated by thin films of molten polydimethylsiloxane. We show that a long-range repulsion reported in earlier work is not an equilibrium force, but can be attributed to viscous drag effects. Consistent with previous results, the viscosity of the film can be modeled by assuming that a layer of polymer molecules is immobilized or "pinned" at each surface for a time longer than the time scale of the measurements. We propose that this pinning is a result of entanglement-like effects in the vicinity of a wall. © 1989 American Institute of Physics.

Date

01 Jan 1989

Publication

The Journal of Chemical Physics

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