A Study of Cohesive Forces, Refractive Indices and Glass Transition Temperature Data of Polymers

摘要

There is a linear relationship between the molar refraction, R, and the sum of the molar-attraction constants, (sq. rt. of (EV)), both for liquids and polymers. It follows that cohesive energy density, E/V, is directly proportional to the refractive index function, (n sq. - 1/n sq. + 2)sq. It is shown and found that for two non-polar rubbers, swelling tends to increase as the refractive index of a solvent approaches that of a rubber, but maximum swelling occurs at a lower refractive index than predicted. As expected, swelling data for polar rubbers and solvents do not follow the predicted trend. No relationship is found between glass temperature (TG) and refractive index for polymers having TG's below 298K because of divergences in data from relationships involving cohesive energy density and TG and between R and (sq. rt. of (EV)). (Author)