Apparent Specific Polarization and Dipole Moment of Some Poly(oxyethylene)Glycols in 1,4-Dioxane and Benzene Solutions at 298.15 K

摘要

The electrical permittivity of 1,4-dioxane and benzene solutions of some poly(oxyethylene)glycols up to the average molecular weight of 1590 were measured at 298.15 K.From the experimental data the limiting apparent specific polarization and partial molar polarization were calculated.The electrical dipole moment of the investigated solutes was estimated according to the Debye,Onsager,and Kirkwood theoretical approaches.The calculated dipole moments increase linearly with the square root of the number of monomeric units.The group dipole moment of the polar monomeric unit was calculated from the corresponding limiting partial molar volume,the refraction and polarization of the solute.The factor g,which takes into account the degree of flexibility of the chain,was estimated and found to be greater than 0.92,which means that the lower members of the poly(oxyethylene)glycols possess almost free rotation within the chain backbone of polymer.