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Atomic Force Probe of Mesoscopic Dielectric and Viscoelastic Fluctuations Near the Glass Transition

Published online by Cambridge University Press:  10 February 2011

L. E. Walther  and
N. E. Israeloff
L. E. Walther
Affiliation:
Department of Physics, Northeastern University, Boston, MA 02115 and Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
N. E. Israeloff
Affiliation:
Department of Physics, Northeastern University, Boston, MA 02115
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Abstract

We report a new experimental approach to study the glass transition and glassy dynamics on a mesoscopic scale. Non contact atomic force microscopy is employed to measure dielectric fluctuations of glass forming polymers such as PVAc. Force modulation techniques, performed with the same instrument, allow us to study viscoelastic properties. A custom-built variable temperature UHV AFM with exceptional thermal stability utilizing piezoresistive cantilevers was used. First results on PVAc include large fluctuations of the viscoelastic properties as a function of applied stress below the glass transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 453
Copyright
Copyright © Materials Research Society 1997

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References

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