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Small Molecule Diffusion in Polymer Ultra-Thin Films

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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.

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Authors and Affiliations

  1. School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA, 30332-0100, USA

    Ivan Ordaz, Lovejeet Singh, Peter J. Ludovice & Clifford L. Henderson

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  1. Ivan Ordaz
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  2. Lovejeet Singh
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  3. Peter J. Ludovice
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  4. Clifford L. Henderson
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Ordaz, I., Singh, L., Ludovice, P. et al. Small Molecule Diffusion in Polymer Ultra-Thin Films. MRS Online Proceedings Library 899, 505 (2005). https://doi.org/10.1557/PROC-0899-N05-05

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  • DOI: https://doi.org/10.1557/PROC-0899-N05-05

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