constitutional heterogeneity 

of polymers
https://doi.org/10.1351/goldbook.C01283
The variation in constitution from molecule to molecule in polymers with molecules uniform with respect to elemental composition. An example is a polymer composed of linear and branched molecules; another example is a statistical copolymer comprising two isomeric constitutional units.
Source:
Purple Book, 1st ed., p. 52 [Terms] [Book]
Citation: 'constitutional heterogeneity' 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.C01283 RIS BibTex EndNote
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Last revised: February 24, 2014