Χ-parameter

{
  "id": "MLC-T-CHM-006332",
  "term": "Χ-parameter",
  "field": "Chemistry",
  "definition": "A dimensionless interaction parameter in polymer solution theory, such as the Flory-Huggins theory, that quantifies the enthalpy of mixing between polymer segments and solvent molecules. A value of 0.5 indicates the theta condition, where the polymer-solvent interactions are effectively neutral. This parameter is temperature-dependent and can be determined experimentally from phase diagrams or osmotic pressure measurements.",
  "subject": "Polymer",
  "see_also": [
    "Flory-Huggins theory",
    "enthalpy",
    "entropy"
  ],
  "references": [
    "Purple Book, 1st ed., p. 59 (http://old.iupac.org/publications/books/author/metanomski.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/kh-parameter/"
}