Collect. Czech. Chem. Commun. 1995, 60, 1950-1970

Properties of Dilute Solutions of Ethylene-Propylene-Diene Terpolymers in Benzene and Toluene

Miloslav Bohdanecký, Antonín Sikora, Jiří Horský and Vladimír Petrus

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic


Commercial samples of ethylene-propylene-diene terpolymers (EPDM) and their fractions were characterized by osmometry (number-average molecular weight, second virial coefficient), viscometry (intrisic viscosity) and 1H NMR spectrometry (mole fraction of propylene monomeric units). The results were analyzed in terms of the two-parameter theory of polymer solutions. Theta temperatures and polymer-solvent interaction parameters were estimated and correlated with composition. Existence of organized structures is indicated by high values of the reduced partial molar entropy parameter y. The increase in y with increasing content of ethylene units is assigned to their association. The results lend support to the previous study on the Huggins viscosity coefficient of EPDM.