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A Broad Perspective on the Dynamics of Highly Confined Polymer Films

Published online by Cambridge University Press:  17 March 2011

Christopher L. Soles ,
Jack F. Douglas ,
Wen-Li Wu ,
Huagen Peng  and
David W. Gidley
Christopher L. Soles
Affiliation:
NIST, Polymers Division, Gaithersburg, MD 20899
Jack F. Douglas
Affiliation:
NIST, Polymers Division, Gaithersburg, MD 20899
Wen-Li Wu
Affiliation:
NIST, Polymers Division, Gaithersburg, MD 20899
Huagen Peng
Affiliation:
University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 48109
David W. Gidley
Affiliation:
University of Michigan, Department of Physics, Ann Arbor, MI 48109
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Abstract

The manner in which the dynamics of a polymer are affected by thin film confinement is of technological significance, impacting thin film applications such as lubricants, adhesives, and chemically amplified photoresists. In this manuscript we use specular X-ray reflectivity (SXR), beam positron annihilation lifetime spectroscopy (PALS), and incoherent neutron scattering (INS) to study the influence of thin film confinement on the apparent glass transition temperature Tg and the thermal expansion coefficients of thin polycarbonate (PC) films. Both the SXR and PALS indicate a significant suppression of Tg when the film thickness becomes less than 200 Å. However, the INS measurements suggest an increase in the apparent Tg below this same length scale. These disparate estimates of the thin film Tg seem to indicate that each technique is sensitive to slightly different aspects of the glass formation process. However, all three agree that thin film confinement results in reduced thermal motion, regardless of the precise temperature that is ‘designated' as the thin film Tg.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 710: Symposia DD – Polymer Interfaces and Thin Films , 2001 , DD3.7.1
Copyright
Copyright © Materials Research Society 2002

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References

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