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branching index

in polymers
A parameter, Math - text, 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, Math - text, to that of an otherwise identical linear molecule, Math - text, with the same relative molecular mass in the same solvent and at the same temperature, i.e. Math - ei.
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2008-10-07; version: 2.0.2.
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