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Creeping friction on amorphous polymers: Dissipation through molecular relaxation

Published online by Cambridge University Press:  01 February 2011

René M. Overney  and
Scott Sills
René M. Overney
Affiliation:
Department of Chemical Engineering, University of Washington, Seattle, WA 98195, U.S.A.
Scott Sills
Affiliation:
Department of Chemical Engineering, University of Washington, Seattle, WA 98195, U.S.A.
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Abstract

The dissipation mechanisms of nanoscale friction between a scanning force microscopy (SFM) tip and amorphous polystyrene are found to reside solely within the polymer's intrinsic molecular mobility, and are discussed with respect to the glass transition temperature. In both the glassy and the rubbery states, lateral force microscopy friction results revealed the dissipative behavior as activated relaxation processes with potential barrier heights of 7 kcal/mol and 83 kcal/mol, respectively. These values correspond to hindered phenyl (side chain) rotation and to the α-relaxation, respectively. The velocity relationship with friction, F(v), was found to satisfy simple fluctuation surface potential models with F ∝const -ln(v) and F ∝const -ln(v)2/3. Within ∼27 K above the glass transition temperature, friction displayed a shear thinning type behavior, also found in materials that exhibit multiple phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P2.1
Copyright
Copyright © Materials Research Society 2004

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References

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