Compressibility effects in neutron scattering by polymer blends

Janna Kay Maranas, Pablo G. Debenedetti, William W. Graessley, Sanat K. Kumar

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this paper, we consider the effects of finite compressibility on the thermodynamics of polymer blends as deduced by neutron scattering. We show that, within the framework of the lattice fluid model and contrary to past conclusions by us and others, the compressibility effects are insignificant for weakly interacting blends. An explanation for the commonly observed parabolic concentration dependence of the Flory-Huggins parameter in isotopic and model polyolefin blends must therefore be sought elsewhere. A compressible interpretation is advantageous for strongly interacting blends, such as polystyrene/poly(vinyl methyl ether), because it reduces significantly the composition dependence of the interaction parameter. We note however, that, even in this case, compressibility need not be introduced into the analysis of the scattering data. The entire analysis can be conducted in terms of the Flory-Huggins model, and the results can then be reexpressed in terms of a compressible model, if that is desired.

Original languageEnglish (US)
Pages (from-to)6943-6946
Number of pages4
JournalMacromolecules
Volume30
Issue number22
DOIs
StatePublished - Nov 3 1997

Fingerprint

Polymer blends
Neutron scattering
Compressibility
Polystyrenes
Polyolefins
Ethers
Thermodynamics
Scattering
Fluids
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Maranas, J. K., Debenedetti, P. G., Graessley, W. W., & Kumar, S. K. (1997). Compressibility effects in neutron scattering by polymer blends. Macromolecules, 30(22), 6943-6946. https://doi.org/10.1021/ma970529p
Maranas, Janna Kay ; Debenedetti, Pablo G. ; Graessley, William W. ; Kumar, Sanat K. / Compressibility effects in neutron scattering by polymer blends. In: Macromolecules. 1997 ; Vol. 30, No. 22. pp. 6943-6946.
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Maranas, JK, Debenedetti, PG, Graessley, WW & Kumar, SK 1997, 'Compressibility effects in neutron scattering by polymer blends', Macromolecules, vol. 30, no. 22, pp. 6943-6946. https://doi.org/10.1021/ma970529p

Compressibility effects in neutron scattering by polymer blends. / Maranas, Janna Kay; Debenedetti, Pablo G.; Graessley, William W.; Kumar, Sanat K.

In: Macromolecules, Vol. 30, No. 22, 03.11.1997, p. 6943-6946.

Research output: Contribution to journalArticle

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