A novel approach for the estimation of the Sanchez-Lacombe interaction parameters for the solubility of ternary polyolefins systems

The total solubility of ethylene in LLDPE presence propane, isobutane and 1-butene is measured using a gravimetric technique at 70 °C pressures up to 5 bars. In order overcome the lack experimental partial data ternary systems, novel approach for estimation Sanchez-Lacombe interaction parameters proposed. measurements combined with independent estimate compressibility factor mixture gases Peng-Robinson EoS as second “data source” were fitted SL identify its parameters. This makes it possible calculate individual component two penetrants non-ideal system where third phase polyethylene. observed trends theoretically interpreted because no available can be found literature these studied systems. Good agreement was between overall PR EoS, difference 1–4% solubilities maximum 0.8% factor.