Determination of the solubility parameters of polyvinylpyrrolidone and poly(vinyl chloride)
by the measurements of partial specific volume
A simple method for the determination of the solubility parameters (d) of polymers has been proposed. The method is based on the measurements of partial specific volume (V2) in a series of solvents of varying solubility parameters^ The values of the parameter d have been obtained from the maximum of the curve V2 vs·d of the solvents. The V2 values have been determined by densitometry and by the optical method of Heller based on the measurements of the refractive index increment. The following solubility parameters have been obtained: for polyvinylpyrrolidone 25.4±0.6 (J/ml)1/2 and for poly(vinyl chloride) 20.3±1.5 (J/ml) 1/2. To obtain a correct value of d of the polymer it is necessary to select solvents belonging to the same group of compounds from the point of view of the strength of hydrogen bond.
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