Abstract
A combination of two equations for the viscometric expansion factor, derived from the two-parameters theory and the blob theory, leads to an equation that permits the calculation of the unperturbed dimensions parameter K ϑ of a polymer from the values of the parameters K and a of the Mark-Houwink-Sakurada equation. The method is especially useful in the high molecular weight region in which the Stockmayer-Fixman-Burchard equation is not valid.
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