Simulation of ternary mixtures of ethylene, 1-hexene, and polyethylene

Solubility and diffusion of ethylene and 1-hexene mixtures in linear amorph ous polyethylene (modeled as C-70) are studied using a recently proposed un ited atom force field. It is found that the presence of 1-hexene increases the solubility of ethylene in polyethylene. These results are also compared to the solubility predictions of the SAFT equation of state. It is also ob served that, in the polymer phase, both ethylene and 1-hexene molecules pre fer to reside in the vicinity of the polymer chain ends. This aggregation e ffect may be important in determining penetrant solubilities in longer poly mers and polymers with short chain branches.