Особливостi змiни з часом електричних властивостей розчинiв полiвiнiлового спирту у диметилсульфоксидi
Long-term changes of the dielectric constant of concentrated (5, 10, and 15 wt.%) solutions of low-molecular polyvinyl alcohol in dimethyl sulfoxide have been studied in a frequency interval of 0.5–200 kHz and at a temperature of 290 ± 1 K. A hypothesis is put forward that the time evolution of diel...
Збережено в:
| Дата: | 2018 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Publishing house "Academperiodika"
2018
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| Теми: | |
| Онлайн доступ: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018702 |
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| Назва журналу: | Ukrainian Journal of Physics |
Репозиторії
Ukrainian Journal of Physics| Резюме: | Long-term changes of the dielectric constant of concentrated (5, 10, and 15 wt.%) solutions of low-molecular polyvinyl alcohol in dimethyl sulfoxide have been studied in a frequency interval of 0.5–200 kHz and at a temperature of 290 ± 1 K. A hypothesis is put forward that the time evolution of dielectric constant is governed by changes in the supramolecular structure of the polymer solution; those changes have a fluctuation nature and are associated with the establishing of equilibrium in the polymer solution. Using the law of corresponding states, a similarity between the kinetics of equilibrium establishment in the polyvinyl alcohol–dimethyl sulfoxide and glycerol–water solutions is demonstrated. With the help of a proposed mathematical model, the characteristic lifetimes and oscillation frequencies of microscopic inhomogeneities in the polyvinyl alcohol solution are determined. |
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