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steric factor

in polymers
The ratio, σ, of the root-mean-square end-to-end distance of a polymer chain with unperturbed dimensions, < r 2 > 0 1 2, to that of a freely rotating chain with the same structure, < r 2 > 0 , f 1 2, i.e. < r 2 > 0 < r 2 > 0 , f, in the limit of infinite chain length. The steric factor reflects the effect of hindrance to free rotation.
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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: 2014-02-24; version: 2.3.3.
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