Separation of Low-Molecular-Weight Fractions of Ultrafine Polytetrafluoroethylene with Supercritical Carbon Dioxideстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Separation of low-molecular-weight fractions of ultrafine polytetrafluoroethylene with supercritical carbon dioxide / Y. E. Vopilov, L. N. Nikitin, A. R. Khokhlov, V. M. Bouznik // Russian Journal of Physical Chemistry B. — 2009. — Vol. 3, no. 7. — P. 1074–1081. The separation of low-molecular-weight fractions of FORUM(R) ultrafine polytetrafluoroethylene (UPTFE) in supercritical carbon dioxide (SC-CO(2)) was studied under static conditions. The experiments were performed over temperature and pressure ranges of 318-383 K and 10-70 MPa, respectively. Over the entire pressure and temperature ranges covered, a behavior typical of solid substance-SC-CO(2) systems was observed: as the pressure and temperature of the solvent increased, so did the concentrations of low-molecular-weight UPTFE fractions in it. The experimental data were interpreted within the framework of three models establishing a relationship between the solubility of a substance with the supercritical fluid density, those proposed by Chrastil, Bartle, and Mendez-Santiago. The experimental data were closely described by the Bartle and Mendez-Santiago models. [ DOI ]

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