Flory-Fox assumption

{
  "id": "MLC-T-CHM-004489",
  "term": "Flory-Fox assumption",
  "field": "Chemistry",
  "definition": "The assumption that Kirkwood-Riseman hydrodynamic theory holds for isolated linear macromolecules in dilute solution whether or not the solvent is at theta conditions. It sets the equivalent hydrodynamic radii for translational diffusion and for viscous flow at fixed fractions of the root-mean-square radius of gyration, about 0.675 and 0.256 respectively, multiplied by expansion factors for a swollen coil. The Flory-Fox viscosity equation is consistent with it.",
  "subject": "Polymer",
  "see_also": [
    "Kirkwood-Riseman theory",
    "equivalent hydrodynamic radius",
    "root-mean-square radius of gyration"
  ],
  "references": [
    "PAC, 2015, 87, 71. 'Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)' on page 104 (https://doi.org/10.1515/pac-2013-0201)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/flory-fox-assumption/"
}