Dispersity in Polymer Science (IUPAC Recommendations 2009)
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.
Page last modified 28 April 2009.
Copyright © 2003-2009 International Union of Pure and Applied Chemistry.
Questions regarding the website, please contact edit.ci@iupac.org
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 Mw / Mn and Xw / Xn. 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.
Page last modified 28 April 2009.
Copyright © 2003-2009 International Union of Pure and Applied Chemistry.
Questions regarding the website, please contact edit.ci@iupac.org
© 2014 by Walter de Gruyter GmbH & Co.
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- Moving Ahead with the International Year of Chemistry
- What Is “Materials Chemistry?”
- Beyond the Book
- Scientific Method: Can It Help Promote the Public Appreciation of Science?
- IUPAC President Publicizes the International Year of Chemistry
- L’Oréal-UNESCO Awards Bestowed Upon Five Exceptional Women Scientists
- Javier Garcia Martinez Named a Young Global Leader
- Deliang Chen Takes the Helm at ICSU
- Postgraduate Course in Polymer Science
- Toward a Comprehensive Definition of Oxidation State
- IUPAC International Chemical Identifier–InChI Update
- Humic-Metal Binding Constants Database
- Provisional Recommendations
- Immunological Effects of Mercury (IUPAC Technical Report)
- Teaching High-Temperature Materials Chemistry at University (IUPAC Technical Report)
- Guidelines for Rheological Characterization of Polyamide Melts (IUPAC Technical Report)
- Dispersity in Polymer Science (IUPAC Recommendations 2009)
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- Interactions of Soil Minerals with Organic Components and Microorganisms
- Biotechnology for the Sustainability of Human Society
- From Molecular Understanding to Innovative Applications of Humic Materials
- D.I. Mendeleev and the Problems of Sustainable Development
- Mendeleev and Natural Resources
- Challenges in Organic and Bioorganic Chemistry
- Biological Surfaces and Interfaces
- Heteroatom Chemistry
- Philosophy of Chemistry
- Advanced Materials
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- Crop Protection Chemistry in Latin America
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Articles in the same Issue
- Masthead
- From the Editor
- Contents
- Moving Ahead with the International Year of Chemistry
- What Is “Materials Chemistry?”
- Beyond the Book
- Scientific Method: Can It Help Promote the Public Appreciation of Science?
- IUPAC President Publicizes the International Year of Chemistry
- L’Oréal-UNESCO Awards Bestowed Upon Five Exceptional Women Scientists
- Javier Garcia Martinez Named a Young Global Leader
- Deliang Chen Takes the Helm at ICSU
- Postgraduate Course in Polymer Science
- Toward a Comprehensive Definition of Oxidation State
- IUPAC International Chemical Identifier–InChI Update
- Humic-Metal Binding Constants Database
- Provisional Recommendations
- Immunological Effects of Mercury (IUPAC Technical Report)
- Teaching High-Temperature Materials Chemistry at University (IUPAC Technical Report)
- Guidelines for Rheological Characterization of Polyamide Melts (IUPAC Technical Report)
- Dispersity in Polymer Science (IUPAC Recommendations 2009)
- Countercurrent Chromatography in Analytical Chemistry (IUPAC Technical Report)
- A Global Science Gateway
- Interactions of Soil Minerals with Organic Components and Microorganisms
- Biotechnology for the Sustainability of Human Society
- From Molecular Understanding to Innovative Applications of Humic Materials
- D.I. Mendeleev and the Problems of Sustainable Development
- Mendeleev and Natural Resources
- Challenges in Organic and Bioorganic Chemistry
- Biological Surfaces and Interfaces
- Heteroatom Chemistry
- Philosophy of Chemistry
- Advanced Materials
- Thermodynamics
- Crop Protection Chemistry in Latin America
- Mark Your Calendar
