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

Sebastian Engelbrecht; Vincent Pichot; Thomas Goepfert; Hungyen Lin; Bernd M. Fischer

doi:10.1016/j.polymer.2022.125285

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

Sebastian Engelbrecht
, Vincent Pichot
, Thomas Goepfert
, Hungyen Lin
, Bernd M. Fischer

School of Engineering

French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, F-68301 Saint-Louis, France

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

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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.

Original language	English
Article number	125285
Number of pages	7
Journal	Polymer
Volume	257
Early online date	5/09/2022
DOIs	https://doi.org/10.1016/j.polymer.2022.125285
Publication status	Published - 4/10/2022

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Polymers
Fickian water diffusion
THz spectroscopy

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10.1016/j.polymer.2022.125285Licence: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

waterdiffusion4
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
Accepted author manuscript, 1.87 MBLicence: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

https://www.sciencedirect.com/science/article/pii/S0032386122007716Licence: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

rds In-situ Terahertz Sensing of Adhesives in Aged Assemblies
Lin, H. (Principal Investigator)
Defence Science and Technology Laboratory (DSTL)
1/12/20 → 3/04/25
Project: Research

Cite this

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title = "Extraction of Fickian water diffusion in polymers using terahertz time-domain spectroscopy",

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.",

keywords = "Polymers, Fickian water diffusion, THz spectroscopy",

author = "Sebastian Engelbrecht and Vincent Pichot and Thomas Goepfert and Hungyen Lin and Fischer, \{Bernd M.\}",

note = "This is the author{\textquoteright}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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T1 - Extraction of Fickian water diffusion in polymers using terahertz time-domain spectroscopy

AU - Engelbrecht, Sebastian

AU - Pichot, Vincent

AU - Goepfert, Thomas

AU - Lin, Hungyen

AU - Fischer, Bernd M.

N1 - 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

PY - 2022/10/4

Y1 - 2022/10/4

N2 - 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.

AB - 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.

KW - Polymers

KW - Fickian water diffusion

KW - THz spectroscopy

U2 - 10.1016/j.polymer.2022.125285

DO - 10.1016/j.polymer.2022.125285

M3 - Journal article

SN - 0032-3861

VL - 257

JO - Polymer

JF - Polymer

M1 - 125285

ER -

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

Abstract

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Projects

rds In-situ Terahertz Sensing of Adhesives in Aged Assemblies

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