Neue Ergebnisse zum Fließverhalten von konzentrierten Polymerlösungen

Abstract

SUMMARY:A variety of meaaurements mainly using solutions of polystyrene and polyvinylacetate-has been made to investigate the correlation between viscosity of concentratsd polymer solutions and both the properties of a11 components of the solution and the experimental conditions. The following parameters have bean changed : polymer concentration, molecular weight, temperature, shear and chemical structure of the solvents. I n addition some measurements have been made using solutions of ethylene-propylene-copolymer, chlorinated polypropylene, polyvinyl alcohol and methylcellulose. Various polymer systems have also been investigated using mixtures of solvents. Data from the literature are reported supplementary to our measurements. It is shown that the results can be explained qualitatively on the basis of physical considerations. Such considerations allowed to predict new effects, for which experimental evidence could be obtained. New correlations with other material properties have been found. Thus we regard these facts as a strong support for the usefullnesa of our concept. 139 FUCHS