High-pressure phase equilibria in the system linear low density polyethylene + isohexane: Experimental results and modelling

Istvan Nagy, Ryan A. Krenz, Robert A. Heidemann, Theo W. de Loos

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High-pressure phase equilibrium data were measured for the system linear low density polyethylene (LLDPE) + isohexane. The LLDPE sample was a hydrogenated polybutadiene (hPBD) and was nearly monodisperse (Mw / Mn = 1.19). Phase transitions were observed visually using a Cailletet apparatus for mixtures with polymer mass fractions from 0 to 0.25 at temperatures from 380 to 500 K and pressures up to 12 MPa. Cloud points, bubble points and three-phase liquid-liquid bubble points were measured. The data were modeled using the modified Sanchez-Lacombe (MSL) equation of state. Results are compared with data and model calculations for the same LLDPE with n-hexane.

Original languageEnglish
Pages (from-to)125-133
Number of pages9
JournalJournal of Supercritical Fluids
Issue number1
Publication statusPublished - Feb 1 2007



  • Bubble point
  • Cloud point
  • Isohexane
  • Linear low density polyethylene
  • Liquid-liquid bubble point
  • Modified Sanchez-Lacombe (MSL) equation of state

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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