Premium
A two‐capillary viscosity method monitored by an analytical balance
Author(s) -
Almin Karl E.,
Swenson Harold A.
Publication year - 1970
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.1970.070140219
Subject(s) - viscometer , capillary action , viscosity , solvent , polymer , relative viscosity , chemistry , flow (mathematics) , intrinsic viscosity , thermodynamics , materials science , mechanics , composite material , organic chemistry , physics
By the simultaneous use of two capillaries, one for solution and one for solvent, and determination of the weight difference of the effluxing liquids with an analytical balance, it is possible, without time measurement, to determine the relative viscosity of a solution with high accuracy. Nylon capillaries were used in the experiments. The equation necessary for calculation of the relative viscosity is derived. The method is particularly useful for very dilute polymer solutions and for the study of low molecular weight substances and lends itself to study of the corrections common in capillary viscometry. Literature values for glucose were confirmed with the method, but low values were found for sodium chloride. The use of bundles of capillaries makes it possible to study the boundary between solvent and solution and to study the possible migration of polymer molecules, in terms of size, toward or away from the walls under conditions of capillary flow. The method can also be used for studying viscous properties of liquids that vary with time.