STRUCTURAL STUDY OF AQUEOUS-SOLUTIONS OF TETRAHYDROFURAN AND ACETONE MIXTURES USING DIELECTRIC-RELAXATION TECHNIQUE

The complex permittivity, static dielectric constant and relaxation ti me for tetrahydrofuran-water and acetone-water mixtures have been dete rmined at 0 degrees, 10 degrees, 25 degrees and 35 degrees C using tim e domain reflectometry technique (TDR). The behaviour of relaxation ti me of the mixture shows a maxima for the mixture with 30% of water by volume. This suggests that the tendency to form cluster between water and solute molecule is maximum for this mixture. The excess permittivi ty for both tetrahydrofuran-water mixture and acetone-water mixtures, are found to be negative. The Kirkwood correlation factor has been det ermined at various concentrations of water. Static dielectric constant for the mixtures have been fitted well with the modified Bruggeman mo del. The values of the Bruggeman parameter a for tetrahydrofuran is fo und to be more than the corresponding value for acetone.