31 No. 3
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.
last modified 28 April 2009.
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