Peculiarities of Changes in Time of Electrical Properties of Polyvinyl Alcohol in Dimethyl Sulfoxide Solutions
Keywords:dielectric permittivity, polyvinyl alcohol solutions, dimethyl sulfoxide, thermodynamic equilibrium
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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