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2016•IUPAC Standards OnlineRequires access

Dispersity in Polymer Science

R.G. Gilbert, M. Hess, Akin Jenkins, R. G. Jones, P. Kratochvíl, Robert F. T. Stepto

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Abstract

This recommendation defines just three terms, viz., (1) molar-mass dispersity, relative-molecular-mass dispersity, or molecular-weight 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 M¯w/M¯n and X¯w/X¯n. 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 non-polymeric) materials on an unambiguous and justifiable footing.

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What this paper is about

This recommendation defines just three terms, viz., (1) molar-mass dispersity, relative-molecular-mass dispersity, or molecular-weight 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 M¯w/M¯n and X¯w/X¯n. 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 non-polymeric) materials on an unambiguous and justifiable footing.

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Available abstract

This recommendation defines just three terms, viz., (1) molar-mass dispersity, relative-molecular-mass dispersity, or molecular-weight 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 M¯w/M¯n and X¯w/X¯n. 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 non-polymeric) materials on an unambiguous and justifiable footing.

Key concepts: Dispersity, Molar mass, Polymer, Terminology, Polymerization, Materials science, Polymer science, Degree of polymerization

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