Inverse gas chromatographic study of sorption thermodynamics in thermally rearranged (TR) polymer based on 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (bisAPAF) and 4,4'-hexafluoroisopropylidene diphthalic anhydride (6FDA)статья

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[1] Inverse gas chromatographic study of sorption thermodynamics in thermally rearranged (tr) polymer based on 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (bisapaf) and 4,4'-hexafluoroisopropylidene diphthalic anhydride (6fda) / N. A. Belov, Y. A. Nizhegorodova, S. Kim et al. // Industrial and Engineering Chemistry Research. — 2013. — Vol. 52, no. 31. — P. 10467–10475. This work reports the first investigation using the inverse gas chromatography method of a polyimide precursor and the product of its thermal rearrangement (TR polymer), extensively studied earlier. Sorption of gases (CO2, C2H6, C3H8) was studied at the finite dilution regime, while vapors (n-alkanes C7, C8, C10, C14, C16) were investigated at infinite dilution. It was demonstrated that thermal treatment at 450 oC results in a significant increase in the solubility coefficients S for large gas molecules. The absolute values observed for the TR polymer solubility coefficients of solutes are significant and comparable with those for the polymer of intrinsic microporosity (PIM-1), the polymer known by the greatest S values among all of the polymers studied. Sorption thermodynamics in the TR polymer is distinguished by very large and negative mixing parameters: enthalpy h̅1E,∞ and entropy s̅1E,∞. [ DOI ]

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