Concentration fluctuations in polymer blend thermodynamics

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

doi:10.1063/1.455116

Concentration fluctuations in polymer blend thermodynamics

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

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

72 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	1704-1708
Number of pages	5
Journal	The Journal of Chemical Physics
Volume	89
Issue number	3
DOIs	https://doi.org/10.1063/1.455116
State	Published - 1988

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.455116

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title = "Concentration fluctuations in polymer blend thermodynamics",

abstract = "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.",

author = "{Olvera De La Cruz}, M. and Edwards, {S. F.} and Sanchez, {I. C.}",

year = "1988",

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AU - Olvera De La Cruz, M.

AU - Edwards, S. F.

AU - Sanchez, I. C.

PY - 1988

Y1 - 1988

N2 - 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.

AB - 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.

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Concentration fluctuations in polymer blend thermodynamics

Abstract

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