Investigation of relaxation processes and phase transition in the polyethylene glycol 400 using IR spectra in a wide temperature range

We examined the amorphocrystalline structures of polyethylene glycol 400 (PEG-400) using thermogravimetric, calorimetric, X-ray phase analysis, dielectric and IR spectroscopies. The physical properties of such a system are affected by the presence of water, due to the formation of the hydration shell. When the amorphic-crystalline PEG-400 is heated, it undergoes first low-temperature and then high-temperature dielectric relaxation. We demonstrate that the low-temperature dielectric relaxation is due to conformational motion of the PEG molecule’s HO–CH2–CH2– end groups. In contrast to that, the high-temperature relaxation is due to the conformational motion in the central parts of the PEG molecule, due to the motion of local topological defects along the backbone of the molecule.

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Publication Details

Journal
Low Temperature Physics
Published
2025-02-01
DOI
https://doi.org/10.1063/10.0035407
Primary Topic
Material Dynamics and Properties
Type
article
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article

Investigation of relaxation processes and phase transition in the polyethylene glycol 400 using IR spectra in a wide temperature range

Роман Дінжос, K. S. Yablochkova, Andriy O. Sobchuk, Eduard Lysenkov et al.
Low Temperature Physics
Material Dynamics and Properties
article

Investigation of relaxation processes and phase transition in the polyethylene glycol 400 using IR spectra in a wide temperature range

Роман Дінжос, K. S. Yablochkova, Andriy O. Sobchuk, Eduard Lysenkov, M. M. Lazarenko, С. А. Алексеев, Neli Koseva, М. В. Лазаренко, A. N. Alekseev, Filip Ublekov, В. Б. Шевченко, Pencho Tuleshkov, N. M. Gregirchak, D. A. Andrusenko
article en

Abstract

We examined the amorphocrystalline structures of polyethylene glycol 400 (PEG-400) using thermogravimetric, calorimetric, X-ray phase analysis, dielectric and IR spectroscopies. The physical properties of such a system are affected by the presence of water, due to the formation of the hydration shell. When the amorphic-crystalline PEG-400 is heated, it undergoes first low-temperature and then high-temperature dielectric relaxation. We demonstrate that the low-temperature dielectric relaxation is due to conformational motion of the PEG molecule’s HO–CH2–CH2– end groups. In contrast to that, the high-temperature relaxation is due to the conformational motion in the central parts of the PEG molecule, due to the motion of local topological defects along the backbone of the molecule.

Low Temperature PhysicsVol. 51(2)
Petro Mohyla Black Sea National University (UA), National University of Food Technologies (UA), Taras Shevchenko National University of Kyiv (UA), Bulgarian Academy of Sciences (BG), Institute of Polymers (BG)
Openalex Percentile: Top 99%
Material Dynamics and Properties
DOISourceOpenAlex
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