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Small Molecule Diffusion in Polymer Ultra-Thin Films

Published online by Cambridge University Press:  26 February 2011

Ivan Ordaz ,
Lovejeet Singh ,
Peter J. Ludovice  and
Cliffod L. Henderson
Ivan Ordaz
Affiliation:
ivan.ordaz@gatech.edu, Georgia Institute of Technology, School of Chemical & Biomolecular Engineering, United States
Lovejeet Singh
Affiliation:
lovejeet.singh@chbe.gatech.eu, Georgia Institute of Technology, School of Chemical & Biomolecular Engineering, United States
Peter J. Ludovice
Affiliation:
peter.ludovice@chbe.gatech.edu, Georgia Institute of Technology, School of Chemical & Biomolecular Engineering, United States
Cliffod L. Henderson
Affiliation:
cliff.henderson@chbe.gatech.edu, Georgia Institute of Technology, School of Chemical & Biomolecular Engineering, United States
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Abstract

The influence of film thickness and polymer molecular weight on the diffusion coefficient of water in poly(methyl methacrylate) thin films supported on gold coated surfaces 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 water in PMMA on weakly interacting substrates is a strong function of film thickness, and that the diffusion coefficient decreases drastically as film thickness is reduced below a critical thickness value. Furthermore, it is found that polymer molecular weight also appears to play an important role in determining the diffusion behavior of such polymer thin film systems.

Keywords

polymerdiffusionfilm
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N05-05
Copyright
Copyright © Materials Research Society 2006

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