The branching index measures the effect of long-chain branches on the size of a macromolecule in solution. It is defined as g =
b2>/ l2>, where sb is the mean square radius of gyration of the branched macromolecule in a given solvent, and sl is the mean square radius of gyration of an otherwise identical linear macromolecule in the same solvent at the same temperature. A value greater than 1 indicates an increased radius of gyration due to branching.
Read more about this topic: Branching (polymer Chemistry)
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