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Diffusional Dynamics Near the Glass Transition in Amorphous Polymer Thin Films

Published online by Cambridge University Press:  10 February 2011

Denise D. Deppe and
John M. Torkelson
Denise D. Deppe
Affiliation:
Departments of Materials Science and Engineering
John M. Torkelson
Affiliation:
Departments of Materials Science and EngineeringChemical Engineering Northwestern University, Evanston, IL 60208
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Abstract

A novel experimental approach involving the fluorescence nonradiative energy transfer technique is employed to study transport processes in thin polymer films near the glass transition through the measurement of energy transfer efficiency, E. Using a layered thin film sample geometry, values of the small molecule diffusion coefficient, , as low as 8 × 10−16 cm2/sec are measured within diffusion times of 3.5 hours. These studies reveal a significant dependence of both the magnitude and temperature dependence of on diffusant size.

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