Beta relaxation

{
  "id": "MLC-T-CHM-001200",
  "term": "Beta relaxation",
  "field": "Chemistry",
  "definition": "A secondary relaxation process observed in polymers below the glass transition temperature, involving localized motions of small segments of the polymer chain. This molecular motion is distinct from the larger-scale cooperative movements associated with the alpha relaxation. Beta relaxation contributes to the mechanical properties of glassy polymers, such as impact strength, and can be detected through dynamic mechanical analysis.",
  "synonyms": [
    "β-relaxation"
  ],
  "subject": "Polymer",
  "see_also": [
    "alpha relaxation",
    "amorphous polymer",
    "loss curve"
  ],
  "references": [
    "PAC, 2013, 85, 1017. 'Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)' on page 1019 (https://doi.org/10.1351/PAC-REC-12-03-02)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/beta-relaxation/"
}