Phase Behavior Study of Poly(ethylene-co-octene) in normal-Hydrocarbons

  • Kwon, Hyuk-Sung (Department of Chemical Engineering, Dong-A University) ;
  • Lee, Sang-Ho (Department of Chemical Engineering, Dong-A University)
  • 발행 : 2003.03.31

초록

Cloud-point and bubble-point data to $170^{\circ}C$ and 50 bar are presented for four different solvents, normal pentane. n-hexane, n-heptane, and n-octane with poly(ethylene-co-42 wt% octene) ($PEO_{42}$) copolymer. The pressure-concentration isotherms measured for $PEO_{42}$ - normal pentane have maximums at around 5 wt% of the copolymer concentrations in the solution. $PEO_{42}$- normal pentane system exhibits LCST-type phase behavior at temperatures greater than $130^{\circ}C$. Below $120^{\circ}C$, bubble-point type transitions are observed. However, the binary mixtures for $PEO_{42}$ in n-hexane, n-heptane, and n-octane have only bubble-point type transitions at the pressure-temperature region investigated in this study. The single-phase region of PEO - alkane mixtures increases with the molecular size of alkane solvent due to the increasing dispersion interactions between PEO and the alkane.

참고문헌

  1. G. Baker, 'Modern Plastics', pp. 65, Chemical Week Associates, New York, Mid October, 1991
  2. M. J. Kaus, 'Modern Plastics Encyclopedia', pp. 68, Chemical Week Associates, New York, Mid October, 1988
  3. Sr. L. K. Mergenhagen, 'Modern Plastics', pp. 64, Chemical Week Associates, New York, Mid October, 1991
  4. R. P. Brentin, 'Modern Plastics Encyclopedia', pp. 57, Chemical Week Associates, New York, 1988
  5. G. R. Landvatter, 'Modern Plastics', pp. 66, Chemical Week Associates, New York, Mid October, 1991
  6. Engage polyolefin elastomer product information, Dupont-Dow Company, September 2001
  7. R. C. Reid, J. M. Prausnitz, and B. E. Poling, 'The Properties of Gases and Liquids', 4th ed., pp. 656, McGraw-Hill, New York, U.S.A., 1987
  8. T. E. Daubert, 'Vapor-Liquid Critical Properties of Elements and Compounds. 5. Branched Alkanes and Cycloalkanes', J. Chem. Eng. Data, 41, 365 (1996) https://doi.org/10.1021/je9501548
  9. S.-H. Lee, M. A. LoStracco, B. M. Hasch, and M. A. McHugh, 'Solubility of Poly(ethylene-co-acrylic acid) in Low Molecular Weight Hydrocarbons: Effect of Copolymer Concentration, Solvent Quality, and Copolymer Molecular Weight', J. Phys. Chem., 98, 4055, (1994)
  10. C. A. Irani, and C. Cozewith, 'Lower critical solution temperature behavior of ethylene - propylene copolymers in multicomponent solvents', J Appl. Poly Sci., 31, 1879, (1986)
  11. M. T. Ratzsch, P. Wagner, C. Wohlfarth, and D. Heise, 'Studies on the high-pressure equilibrium in mixtures of ethylene and ethylene-vinyl acetate copolymers', Acta Polymerica, 33, 463, (1982)
  12. M. T. Ratzsch, P. Wagner, C. Wohlfarth, and S. Gleditzsch, 'Studies of phase equilibria in mixtures of ethylene and (ethylene-vinyl acetate) copolymers at high pressures. Part Ill. Effect of the molecular weight distribution', Acta Polymerica, 34, 340, (1983)
  13. G. Allen, and C. H. Baker, 'Lower critical-solution phenomena in polymer-solvent systems', Polymer, 6, 181, (1965)
  14. T. W. de Loos, W. Poot, and G. A. Diepen, 'Fluid phase equilibria in the system polyethylene + ethylene. 1. Systems of linear polyethylene + ethylene at high pressure', Macromolecules, 16, 111, (1983)