Williams-Landel-Ferry equation

{
  "id": "MLC-T-CHM-012702",
  "term": "Williams-Landel-Ferry equation",
  "field": "Chemistry",
  "definition": "An empirical equation that describes the temperature dependence of the viscoelastic properties of amorphous polymers above their glass transition temperature. It relates the shift factor, used in time-temperature superposition, to temperature differences from a reference temperature. This equation is widely applied to predict the long-term mechanical behavior of polymers from short-term measurements at different temperatures.",
  "synonyms": [
    "WLF Equation"
  ],
  "subject": "Polymer",
  "see_also": [
    "shift factor",
    "time-temperature superposition principle"
  ],
  "references": [
    "PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1044 (https://doi.org/10.1351/PAC-REC-12-03-02)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/williams-landel-ferry-equation/"
}