Abstract
Experimental data are presented for the equilibrium solubility of styrene oligomers up to chain lengths of 25 monomeric units in ethane at 333 K and at pressures of 15, 25 and 34 MPa. It was observed that at a given pressure and temperature, a mass-based partition coefficient of an n-mer between the polymerich phase and the dense-gas phase is essentially independent of the compositions of the two equilibrium phases and depends only on the chain length of the n-mer. A new lattice model, developed from statistical-mechanics, is used to reproduce quantitatively the dependence of the partition coefficient on chain length and pressure. Only a single interaction parameter is necessary for all chain lengths and pressures. The practical viability of using supercritical fluids for polymer fractionatiion is also discussed.
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