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Vol. 31 No. 3
May-June 2009

Making an imPACt | Recent IUPAC technical reports and recommendations that affect the many fields of pure and applied chemistry.
See also www.iupac.org/publications/pac

Dispersity in Polymer Science (IUPAC Recommendations 2009)
by Robert F.T. Stepto
Pure and Applied Chemistry, 2009
Vol. 81, No. 2, pp. 351–353

This recommendation defines just three terms: (1) molar-mass dispersity, (2) degree-of-polymerization dispersity, and (3) dispersity. “Dispersity” is a new word, coined to replace the misleading but widely used term “polydispersity index” for and . The document, although brief, also has a broader significance in that it seeks to put the terminology describing dispersions of distributions of properties of polymeric (and nonpolymeric) materials on unambiguous and justifiable footing. The general symbol Ð, pronounced “D-stroke,” is introduced for dispersity to avoid confusion with the conventional use of D for diffusion coefficient.

http://dx.doi.org/10.1351/PAC-REC-08-05-02


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