Alpha relaxation

{
  "id": "MLC-T-CHM-000445",
  "term": "Alpha relaxation",
  "field": "Chemistry",
  "definition": "The primary glass transition relaxation observed in amorphous polymers, associated with large-scale cooperative segmental motions of the polymer backbone. This relaxation occurs at the glass transition temperature (Tg) and is responsible for the transition from a rigid, glassy state to a more flexible, rubbery state. It is typically detected by dynamic mechanical analysis or differential scanning calorimetry.",
  "synonyms": [
    "α-relaxation"
  ],
  "subject": "Polymer",
  "see_also": [
    "glassy state",
    "loss curve",
    "beta relaxation"
  ],
  "references": [
    "PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1018 (https://doi.org/10.1351/PAC-REC-12-03-02)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/alpha-relaxation/"
}