branching index 

https://doi.org/10.1351/goldbook.B00726
A parameter, g, characterizing the effect of long-chain branches on the size of a branched macromolecule in solution and defined as the ratio of the mean-square radius of gyration of a branched molecule, <sb2>, to that of an otherwise identical linear molecule, <sl2>, with the same relative molecular mass in the same solvent and at the same temperature, i.e. g=<sb2><sl2>.
Source:
Purple Book, 1st ed., p. 51 [Terms] [Book]
Citation: 'branching index' 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.B00726 RIS BibTex EndNote
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Last revised: October 7, 2008