steric factor 

in polymers
https://doi.org/10.1351/goldbook.S05999
The ratio, σ, of the root-mean-square end-to-end distance of a polymer chain with unperturbed dimensions, <r2>01/2, to that of a freely rotating chain with the same structure, <r2>0,f1/2, i.e. <r2>0<r2>0,f, in the limit of infinite chain length. The steric factor reflects the effect of hindrance to free rotation.
Source:
Purple Book, 1st ed., p. 50 [Terms] [Book]
Citation: 'steric factor' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05999 RIS BibTex EndNote
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Last revised: February 24, 2014