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

Engelbrecht, Sebastian and Pichot, Vincent and Goepfert, Thomas and Lin, Hungyen and Fischer, Bernd M. (2022) Extraction of Fickian water diffusion in polymers using terahertz time-domain spectroscopy. Polymer, 257. ISSN 0032-3861

Text (waterdiffusion4)
waterdiffusion4.pdf - Accepted Version
Restricted to Repository staff only until 5 September 2023.
Available under License Creative Commons Attribution-NonCommercial-NoDerivs.

Download (1MB)


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.

Item Type:
Journal Article
Journal or Publication Title:
Additional Information:
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
Uncontrolled Keywords:
ID Code:
Deposited By:
Deposited On:
05 Sep 2022 13:20
Last Modified:
04 Oct 2022 03:00