degrees of cistacticity and transtacticity 

https://doi.org/10.1351/goldbook.D01571
For a regular polymer containing double bonds in the main chain of the constitutional repeating units these are the fractions of such double bonds that are in the cis and trans configurations, respectively.
Source:
Purple Book, 1st ed., p. 46 [Terms] [Book]
Citation: 'degrees of cistacticity and transtacticity' 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.D01571 RIS BibTex EndNote
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Last revised: February 24, 2014