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Received August 16, 2002
Accepted September 25, 2002
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Solvent Power Dependence of Phase Behavior of Biodegradable Polymers in High-Pressure Hydrofluorocarbons
Department of Chemical Engineering, Hannam University, Daejeon 306-791, Korea
bclee@mail.hannam.ac.kr
Korean Journal of Chemical Engineering, May 2003, 20(3), 542-548(7), 10.1007/BF02705563
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Abstract
Phase behavior data at temperatures from 30 ℃ to 100 ℃ and at pressures from 30 bar to 850 bar are presented for poly(D,L-lactide) in hydrofluorocarbon solvents: difluoromethane (HFC-32), trifluoromethane (HFC-23), and 1,1,1,2-tetrafluoroethane (HFC-134a). The cloud point pressures were measured by using a high-pressure equilibrium apparatus equipped with a variable-volume view cell, and were investigated as functions of temperature, polymer concentration, and polymer molecular weight. The solvent power of hydrofluorocarbon solvents of dissolving the poly(D,L-lactide) increased in the order HFC-23, HFC-32, and HFC-134a, in proportion to their dipole moments.
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References
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Lee BC, Kim NI, Korean J. Chem. Eng., 19(1), 132 (2002)
Lee JM, Lee BC, Lee SH, J. Chem. Eng. Data, 45, 851 (2000)
Lee JM, Lee BC, Hwang SJ, J. Chem. Eng. Data, 45, 1162 (2000)
Lee SH, McHugh MA, Korean J. Chem. Eng., 19(1), 114 (2002)
Lide DR, editor-in-chief, "CRC Handbook of Chemistry and Physics," 76th ed., CRC Press, Boca Raton, FL (1995)
McHugh MA, Krukonis VJ, "Supercritical Fluid Extraction, Principles and Practice," 2nd ed., Butterworth-Heinemann, Boston, MA (1994)
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Miller KJ, Savchik JA, J. Am. Chem. Soc., 101, 7206 (1979)
Reverchon E, Della Porta G, DeRosa I, Subra P, Letourmeur D, J. Supercrit. Fluids, 18, 239 (2000)
Reverchon E, J. Supercrit. Fluids, 15(1), 1 (1999)
Song KH, Lee CH, Lim JS, Lee YW, Korean J. Chem. Eng., 19(1), 139 (2002)
