Secondary relaxation

{
  "id": "MLC-T-CHM-010628",
  "term": "Secondary relaxation",
  "field": "Chemistry",
  "definition": "A molecular motion in polymers that occurs at temperatures below the glass transition temperature, involving localized movements of small segments of the polymer chain. These relaxations are typically associated with side-group rotations or crankshaft motions of the main chain. They are observed as peaks in the mechanical or dielectric loss spectra.",
  "subject": "Polymer",
  "see_also": [
    "beta relaxation",
    "gamma relaxation",
    "loss curve"
  ],
  "references": [
    "PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1037 (https://doi.org/10.1351/PAC-REC-12-03-02)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/secondary-relaxation/"
}