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CONCENTRATION AND TEMPERATURE DEPENDENCE OF DIFFUSIONAL DEBORAH NUMBER DURING DODECANE TRANSPORT IN CROSSLINKED POLYSTYRENE
Korean Journal of Chemical Engineering, March 1996, 13(2), 123-128(6), 10.1007/BF02705898
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Abstract
The diffusional Deborah number, De, defined as the ratio of characteristic relaxation time to characteristic diffusion time was determined as a function of concentration and temperature in the dodecane transport process in polystyrene. The characteristic relaxation time was obtained from the viscoelastic properties of dodecane/polystyrene systems measured by a dynamic mechanical analyzer. The characteristic diffusion time was obtained from the concen-tration and temperature dependence of the diffusion coefficient measured by NMR PGSE method. Above the room temperature the Deborah number changed significantly during isothermal transport process; however, the transport mechanism did not deviate from the Fickian transport as the order of De was still greater than 1. Around the room temperature the transport mechanisms represented by the resulting diffusional Deborah number changed significantly as the order of magnitude approached 1 with the temperature decreasing from 50℃ to the room temperature. The transport mechanism predicted from the diffusional Deborah number was verified by the diffusional exponent, n, of an exponential time-dependence of the penetrant uptake.
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References
Alfrey T, Gurnee EF, Lloyd WG, J. Polym. Sci. C: Polym. Lett., 12, 249 (1961)
Bird RB, Armstrong RC, Hassager O, "Dynamics of Polymeric Liquids," 2nd Ed., Vol. 1, Wiley, New York (1987)
Duda JL, Ni YC, Vrentas JS, Macromolecules, 12, 459 (1979)
Ferry JD, "Viscoelastic Properties of Polymers," 3rd Ed., Wiley, New York (1980)
Kim D, Caruthers JM, Peppas NA, Macromolecules, 26, 1841 (1993)
Kim DJ, Caruthers JM, Peppas NA, J. Polym. Sci. B: Polym. Phys., 32(9), 1593 (1994)
Nicolais L, Drioli E, Hopfenberg HB, Apicella A, Polymer, 20, 459 (1979)
Ritger PL, Peppas NA, Fuel, 66, 815 (1987)
VanKrevelen DW, "Properties of Polymers," Elsevier, New York, NY (1976)
Vrentas JS, Jarzebski CM, Duda JL, AIChE J., 21, 894 (1975)
Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)
Vrentas JS, Liu HT, Duda JL, J. Appl. Polym. Sci., 25, 1297 (1980)
Bird RB, Armstrong RC, Hassager O, "Dynamics of Polymeric Liquids," 2nd Ed., Vol. 1, Wiley, New York (1987)
Duda JL, Ni YC, Vrentas JS, Macromolecules, 12, 459 (1979)
Ferry JD, "Viscoelastic Properties of Polymers," 3rd Ed., Wiley, New York (1980)
Kim D, Caruthers JM, Peppas NA, Macromolecules, 26, 1841 (1993)
Kim DJ, Caruthers JM, Peppas NA, J. Polym. Sci. B: Polym. Phys., 32(9), 1593 (1994)
Nicolais L, Drioli E, Hopfenberg HB, Apicella A, Polymer, 20, 459 (1979)
Ritger PL, Peppas NA, Fuel, 66, 815 (1987)
VanKrevelen DW, "Properties of Polymers," Elsevier, New York, NY (1976)
Vrentas JS, Jarzebski CM, Duda JL, AIChE J., 21, 894 (1975)
Vrentas JS, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)
Vrentas JS, Liu HT, Duda JL, J. Appl. Polym. Sci., 25, 1297 (1980)
