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expansion factor
in polymers
The ratio of a dimensional characteristic of a macromolecule in a given solvent at a given temperature to the same dimensional characteristic in the Math - text state at the same temperature. The most frequently used expansion factors are: expansion factor of the mean-square end-to-end distance, Math - ei; expansion factor of the radius of gyration Math - ei; viscosity expansion factor Math - ei where Math - text and Math - text are the intrinsic viscosity in a given solvent and in the Math - text state at the same temperature, respectively. Expansion factors defined by different dimensional characteristics are not exactly equal, nor need they have a constant ratio as a function of relative molecular mass.
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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.
DOI of this term: doi:10.1351/goldbook.E02270
Original PDF version (may be out of date): http://www.iupac.org/goldbook/E02270.pdf.
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