Lösungseigenschaften von äthylcellulose. Vergleichende bestimmungen von molekulargewichten und zweiten virialkoeffizienten mittels osmose,lichtstreuung und sedimentation/diffusion

Osmotic and light scattering measurements on ethylcellulose have been carried out in acetone, ethylacetate, 2-butanol, n-butylchloride, and benzene (osmosis only). In some cases the results were controlled by measurements of sedimentation/diffusion. By comparing the different experimental techniques it was possible to distinguish clearly results unaffected from those affected by the presence of gels. The second virial coefficients from osmotic and hydrodynamic measurements are low as compared to those of vinyl polymers. In contrast to this finding the exponent ε of the radius of gyration versus molecular weight relation is low. Negative values of ε reflect the influence of gels. The dependence of the second virial coefficient on the solvent is not pronounced.