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characteristic ratio

in polymers
The ratio of the mean-square end-to-end distance, < r 2 > 0, of a linear polymer chain in a theta state to N · L 2, where N is the number of rigid sections in the main chain, each of length L; if all of the rigid sections are not of equal length, the mean-square value of L is used, i.e.
L 2 = ∑ i L i 2 – N
In simple single-strand chains, the bonds are taken as the rigid sections. The recommended symbol is: C N (C ∞ when N → ∞).
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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: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.C00982.
Original PDF version: http://www.iupac.org/goldbook/C00982.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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