SOLUTE-SOLVENT INTERACTION IN AQUEOUS PEG SOLUTION

The hydration and solute-solvent interaction parameters of five polyethylene glycols PEG 200, 300, 400, 600 and 1000, have been reported. The hydration has been unambiguously evaluated using conductance and viscosity methods. A comparison of the important literature cited hydrations of EO group with the results of this study has been made. The viscosity B and C coefficients have been obtained from a quadratic fitting of relative viscosity with mol dm-3 concentration of the PEG. The B coefficient has been analysed in the light of molecular size, solvation and water-structure modification. The solute-solute interaction parameter C has been observed to be significant for PEG 600 and 1000. The results are more consistent than that reported by Bahri and Guveli given in reference seventeen.