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Effect of Thin Film Confinement on the Transport Properties of Ultra-Thin Polymer Films

Published online by Cambridge University Press:  01 February 2011

Lovejeet Singh ,
Peter J. Ludovice  and
Clifford L. Henderson
Lovejeet Singh
Affiliation:
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332–0100
Peter J. Ludovice
Affiliation:
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332–0100
Clifford L. Henderson*
Affiliation:
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332–0100
*
* E-mail: cliff.henderson@chbe.gatech.edu, Phone: (404)-385–0525
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Abstract

The influence of film thickness and polymer molecular weight on the diffusion coefficient of a series of small molecule penetrants (including water, benzene, and trifluoroacetic acid) in thin films of two different model photoresist polymers (poly(p-hydroxystyrene) and bis-triflouromethyl carbinol substituted poly(norbornene)) has been studied using vapor sorption experiments via quartz crystal microbalance (QCM) methods. Diffusion coefficients for films ranging in thickness from approximately 1 μm to 50 nm were determined. It is observed that the diffusion coefficient of small molecules in a thin polymer film is a strong function of film thickness, and that the diffusion coefficient decreases drastically as film thickness is reduced below a critical thickness value. This critical thickness value is found to be a function of both the type of polymer used and the polymer molecular weight.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P9.6
Copyright
Copyright © Materials Research Society 2004

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References

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