degree-of-polymerisation dispersity

symbol: $Ð\!_{\rm{X}}$
https://doi.org/10.1351/goldbook.12225
Ratio of the mass-average degree of polymerisation, \(X_{\rm{m}}\), to the number-average degree of polymerisation, \(X_{\rm{n}}\). \[Ð\!_{\rm{X}} = X_{\rm{m}}/X_{\rm{n}}\]
Note: Use of the term "polydispersity index", or other terms involving the word "polydispersity", for \(X_{\rm{m}}/X_{\rm{n}}\) is strongly discouraged.
Source:
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 [Terms] [Paper]
Citation: 'degree-of-polymerisation dispersity' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12225 RIS BibTex EndNote
Div. IVTextXMLJSON