Effect of polymer chain-length polydispersity on the phase behavior of model athermal mixtures of colloids and flexible self-excluding polymers

Patrice Paricaud, Szabolcs Varga, Peter T. Cummings, George Jackson

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The effect of polymer polydispersity on the fluid-fluid demixing of an athermal mixture of colloids and self-excluding polymers is analysed with the first-order thermodynamic perturbation theory (TPT1) of Wertheim. The colloidal particles and the segments making up the polymer chains are modeled as hard spheres of different diameters. The polydispersity of the polymer is represented by a distribution of chain lengths. The polydispersity increases the extent of demixing; the critical composition remains relatively unaffected, while the critical packing fraction decreases substantially. The polymers with the longest chains are responsible for the increase in the extent of immiscibility.

Original languageEnglish
Pages (from-to)489-494
Number of pages6
JournalChemical Physics Letters
Issue number4-6
Publication statusPublished - Nov 11 2004


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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