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Belov, Nikolay A.,Nizhegorodova, Yulia A.,Kim, Seungju,Han, Sang Hoon,Yampolskii, Yuri P.,Lee, Young Moo American Chemical Society 2013 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.52 No.31
<P>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 (CO<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>6</SUB>, C<SUB>3</SUB>H<SUB>8</SUB>) was studied at the finite dilution regime, while vapors (<I>n</I>-alkanes C<SUB>7</SUB>, C<SUB>8</SUB>, C<SUB>10</SUB>, C<SUB>14</SUB>, C<SUB>16</SUB>) were investigated at infinite dilution. It was demonstrated that thermal treatment at 450 °C results in a significant increase in the solubility coefficients <I>S</I> 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 <I>S</I> values among all of the polymers studied. Sorption thermodynamics in the TR polymer is distinguished by very large and negative mixing parameters: enthalpy <I>h̅</I><SUB><SUB>1</SUB></SUB><SUP><I>E</I>,∞</SUP> and entropy <I>s̅</I><SUB><SUB>1</SUB></SUB><SUP><I>E</I>,∞</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2013/iecred.2013.52.issue-31/ie3034027/production/images/medium/ie-2012-034027_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie3034027'>ACS Electronic Supporting Info</A></P>