Polystyrene/decahydronaphthalene/propane phase equilibria and polymer conformation properties from intrinsic viscosities |
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Authors: | Nathaniel Cain Alexander Haywood George Roberts Douglas Kiserow Ruben Carbonell |
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Affiliation: | 1. Department of Chemical & Biomolecular Engineering, North Carolina State University, 1017 Main Campus Drive, Partners' Building I, Suite 3200, Box 7006, Raleigh, North Carolina 27606‐7006;2. U.S. Army Research Office, 4300 So. Miami Blvd, Research Triangle Park, North Carolina 27709 |
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Abstract: | The influence of dissolved propane (up to 31.2 wt %) on the phase equilibria of 5 wt % polystyrene (PS) dissolved in 66/34 wt % trans/cis‐decahydronaphthalene (DHN) was measured over the temperature range of 323–423 K. A suitable temperature, pressure, and propane composition operating space was defined to measure intrinsic viscosities of a single fluid phase. Intrinsic viscosities of PS in cosolvent mixtures of propane and trans/cis‐DHN were measured between 323 and 423 K and between 70 and 208 bar. The addition of propane to the isomeric mixture of DHN resulted in a decreased solvent quality for PS, causing a contraction of the PS coil. The most dramatic decrease in solvent quality with the addition of propane occurred at 323 K and 70 bar with approximately a 36% reduction in the viscometric radius with the addition of 45 mol % propane to DHN. At 423 K, the solvent quality was less sensitive to the addition of propane and only a 13% reduction in the viscometric radius was observed at 70 bar and 45 mol % propane in DHN. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 |
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Keywords: | conformational analysis decahydronaphthalene intrinsic viscosity miscibility phase behavior phase diagrams phase separation polystyrene viscosity |
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