Residual Water in Polyvinyl Alcohol

R. R. Khasbiullin^a, Yu. V. Kostina^b, T. F. Petrova^a, G. N. Bondarenko^b,
A. E. Chalykh^a, V. F. Chuvaev^a, and V. K. Gerasimov^a

^aFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia

^bTopchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences,
Leninskii pr. 29, Moscow, 119071 Russia

e-mail: vladger@mail.ru

Received November 29, 2013;
Revised Manuscript Received April 10, 2014

Abstract—The state of sorbed water molecules in the matrix of polyvinyl alcohol is investigated via the meth-
ods of static sorption, DSC, TGA, IR Fourier spectroscopy, ¹H NMR spectroscopy, and quantum-chemical sim-
ulation. It is shown that the sorption of water by polyvinyl alcohol characterized by an S-shaped isotherm is
described by the double-sorption model. It is established that the low diffusion coefficients and extremely low
rates of desorption processes observed in the range of low activities are determined by a shift of the equilibrium
toward the formation of hydrogen-bonded complexes of water molecules with hydroxy groups of the polymer.
A mechanism for the behavior of residual water in hydrophilic polymers is suggested. It implies that differences
between polymers are determined only by the quantity of residual water immobilized in “traps” and the energy
of hydrogen-bond formation.

DOI: 10.1134/S0965545X14050095

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