Measurements of mass-fraction activity coefficient at infinite dilution of aliphatic and aromatic hydrocarbons, thiophene, alcohols, water, ethers, and ketones in hyperbranched polymer, Boltorn H2004, using inverse gas chromatography

Abstract

Thermodynamic properties of the hyperbranched polymer, Boltorn H2004 (B-H2004), were investigated by inverse gas chromatography with 42 different solvents: n-alkanes (C 5–C 10), cycloalkanes (C 5–C 8), alkenes (C 5–C 8), alkynes (C 5–C 8), aromatic hydrocarbons (benzene, toluene, ethylbenzene, o-, m-, p-xylene, thiophene), alcohols (C 1–C 5), water, ethers (tetrahydrofuran (THF), methyl- tert-butylether (MTBE), diethyl-, di- n-propyl-, di- n-butyl ether), and ketones (acetone, 2-pentanone, 3-pentanone, 2-hexanone, 3-hexanone, cyclopentanone) at the temperatures from (308.15 to 348.15) K using the inverse gas chromatography (IGC). The density and thermophysical properties of polymer were described. The specific retention volume ( V g ), the mass-fraction activity coefficient at infinite dilution ( Ω 13 ∞ ) , the Flory–Huggins interaction parameter ( χ 13 ∞ ) , the molar enthalpy of sorption in the polymer ( Δ s H ) , the partial molar excess enthalpy at infinite dilution ( Δ H 1 E , ∞ ) , the molar enthalpy of vaporization to the ideal-gas state for the pure solutes ( Δ vap H 0 ) , the partial molar Gibbs excess energy at infinite dilution ( Δ G 1 E , ∞ ) , and the solubility parameter of the polymer ( δ 3), were calculated. The UNIFAC-FV model was used to predict the mass-fraction activity coefficient at infinite dilution for different solutes in the B-H2004 polymer.