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Viscosity–concentration relationships in solutions of high polymers
Author(s) -
Thomas D. K.,
Thomas T. A. J.
Publication year - 1960
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1960.070030801
Subject(s) - exponential function , solvent , viscosity , polymer , thermodynamics , intrinsic viscosity , exponential type , exponential decay , chemistry , polymer chemistry , materials science , physics , mathematics , organic chemistry , mathematical analysis , nuclear physics
Measurements of the viscosities of a number of polymer‐solvent systems have shown that an exponential expression, η = η0e[η]c, is applicable in the Concentration range up to c = 0.13 g./lOO cc. of solvent to within the precision of the experimental measurements. This exponential equat.ion lends itself readily to the determination of the intrinsic viscosity [η] from a single determination of η/η0 and is therefore of great use in determining molecular weights of high polymers from a Houwink‐type expression. At higher concentrations, departures from the exponential equation occur, but agreement remains reasonably good up to a con‐ centration of 1 g./l00 cc. of solvent. The experimental results are compared with those predicted by the exponential expression and with those expected from a Huggins‐type equation in which k′ = 0.5, which corresponds to the first two terms of the expanded form of the exponential.