Concentration fluctuations in polymer blend thermodynamics

M. Olvera De La Cruz*, S. F. Edwards, I. C. Sanchez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


Monomer concentration fluctuations in high molecular weight polymer blends are investigated. The fluctuations reduce the value of the χ interaction term in the Flory-Huggins free energy by a factor of (1 - 6/π2) and add a concentration and molecular weight contribution which decreases phase stability for off-critical compositions. Except at the critical point, the spinodal values are smaller than those predicted from a Flory-Huggins-type free energy. For an incompressible blend with components of equal size N, the corrections to the spinodal were found to vary as |1 - 2φ0| 4/3N-1/3, where φ0 is the mean concentration.

Original languageEnglish (US)
Pages (from-to)1704-1708
Number of pages5
JournalThe Journal of Chemical Physics
Issue number3
StatePublished - 1988

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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