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  • waterdiffusion4

    Rights statement: This is the author’s version of a work that was accepted for publication in Polymer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer, 257, 125285, 2022 DOI: 10.1016/j.polymer.2022.125285

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Extraction of Fickian water diffusion in polymers using terahertz time-domain spectroscopy

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • Sebastian Engelbrecht
  • Vincent Pichot
  • Thomas Goepfert
  • Hungyen Lin
  • Bernd M. Fischer
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Article number125285
<mark>Journal publication date</mark>4/10/2022
<mark>Journal</mark>Polymer
Volume257
Number of pages7
Publication StatusPublished
Early online date5/09/22
<mark>Original language</mark>English

Abstract

The dynamic behavior of polycarbonate and poly(methyl methacrylate) upon water immersion at temperatures of 40 °C and 70 °C was studied by gravimetric measurements and by terahertz time-domain spectroscopy. Time-resolved measurements of the terahertz refractive index and absorption coefficient show a good agreement to the gravimetric measurements. Assuming a Fickian diffusion mechanic the diffusion coefficients were extracted from both methods. It was found that the terahertz measurements provide a reliable non-contact way to study the water diffusion in polymers. Especially, the THz absorption coefficient seems to be a robust method to determine the diffusion coefficients.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Polymer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer, 257, 125285, 2022 DOI: 10.1016/j.polymer.2022.125285