Phase Equilibrium and Diffusion of Solvents in Polybutadiene: A Capillary-Column Inverse Gas Chromatography Study

W.D. Cai, N. Ramesh, F. Tihminlioglu, R.P. Danner, J.L. Duda, A.B. de Haan

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Abstract

The capillary-column inverse gas chromatography method was used to measure the diffusion and partition coefficients of ethylbenzene, styrene, and acrylonitrile in polybutadiene (PBD) at infinite dilution of the solvents. Experiments were performed over a temperature range of 50-125 °C. At temperatures well above the glass-transition temperature of PBD, the diffusivities were correlated using an Arrhenius expression. The Arrhenius parameters in turn were intercorrelated and shown to be a function of the occupied volume, thus providing a method for predicting the diffusion of other solvents in the same polymer. Further, the activation energy was predicted using the Duda-Vrentas free-volume approach. The activation energy thus obtained was compared with the activation energy of the Arrhenius approach. The weight-fraction activity coefficient data were compared to the predictions of the group contribution, lattice-fluid equation-of-state, and the UNIquac Functional-group Activity Coefficient (UNIFAC) free-volume models.
Original languageUndefined
Pages (from-to)1046-1055
Number of pages10
JournalJournal of polymer science. Part B: Polymer physics
Volume40
Issue number10
DOIs
Publication statusPublished - 2002

Keywords

  • METIS-206958
  • IR-71894
  • Inverse gas chromatography
  • Diffusion
  • UNIFAC
  • acrylonitrile
  • styrene
  • free-volume theory
  • Phase behavior
  • lattice fluid
  • polybutadiene
  • ethylbenzene
  • equation of state

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