Molar-mass dispersity

{
  "id": "MLC-T-CHM-007475",
  "term": "Molar-mass dispersity",
  "field": "Chemistry",
  "definition": "A measure of the breadth of the molar mass distribution in a polymer sample, indicating the heterogeneity of chain lengths. It is calculated as the ratio of the weight-average molar mass to the number-average molar mass. A value of 1.0 indicates a perfectly monodisperse sample, where all polymer chains have the same molar mass.",
  "synonyms": [
    "molecular-weight dispersity",
    "relative-molar-mass dispersity",
    "relative-molecular-mass dispersity"
  ],
  "subject": "Polymer",
  "see_also": [
    "mass-average molar mass"
  ],
  "references": [
    "PAC, 2015, 87, 71. 'Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)' on page 88 (https://doi.org/10.1515/pac-2013-0201)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/molar-mass-dispersity/"
}