Polyethylene glycol (PEG) is a well-known water retention agent in biomedical products, the hydration efficiency of which is affected by its molecular weight. Using a broadband dielectric spectroscopy (100 MHz–18 THz), the hydration state of PEG aqueous solutions with various molecular weights was quantitatively evaluated. As the molecular weight increases, the restriction strength of hydration water increases in potency, while the number of hydration water molecules decreases. Owing to the opposite changes in hydration number and restriction strength, the measured collective hydrogen bond (HB) strength shows negligible molecular weight dependence. PEG with larger Mw produces a more heterogenous HB network. The internal folding and twining caused by the growth of the PEG chain obstruct the proper exposure of hydrophilic part of the monomer producing less hydration waters. The evaluation result supports an application of PEGs with low molecular weight in contact lens package solutions.
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10 January 2022
Research Article|
January 11 2022
Characterization of hydrogen bond network of waters around polyethylene glycol by broadband dielectric spectroscopy
Junru Hu;
Junru Hu
1
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
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Hiroyasu Yamahara
;
Hiroyasu Yamahara
1
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
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Zhiqiang Liao
;
Zhiqiang Liao
1
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
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Yasuo Yano;
Yasuo Yano
2
Department of Bioengineering, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
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Hitoshi Tabata
Hitoshi Tabata
a)
1
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
2
Department of Bioengineering, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Junru Hu
1
Hiroyasu Yamahara
1
Zhiqiang Liao
1
Yasuo Yano
2
Hitoshi Tabata
1,2,a)
1
Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
2
Department of Bioengineering, Graduate School of Engineering, The University of Tokyo
, Tokyo 113-8656, Japan
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 120, 023702 (2022)
Article history
Received:
November 16 2021
Accepted:
December 31 2021
Citation
Junru Hu, Hiroyasu Yamahara, Zhiqiang Liao, Yasuo Yano, Hitoshi Tabata; Characterization of hydrogen bond network of waters around polyethylene glycol by broadband dielectric spectroscopy. Appl. Phys. Lett. 10 January 2022; 120 (2): 023702. https://doi.org/10.1063/5.0078938
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