Low-shear-rate capillary viscometer for polymer solution intrinsic viscosity determination at varying temperatures

A low-shear capillary viscometer has been designed, constructed, and used to measure polymer solution intrinsic viscosities over temperatures ranging from 10 to 75 °C. The instrument is capable of detecting the small shear stress forces produced when low-viscosity fluids are subjected to very low-sh...

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Bibliographic Details
Published in:Review of scientific instruments 2003-01, Vol.74 (1), p.176-181
Main Authors: Rushing, T. S., Hester, R. D.
Format: Article
Language:English
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Summary:A low-shear capillary viscometer has been designed, constructed, and used to measure polymer solution intrinsic viscosities over temperatures ranging from 10 to 75 °C. The instrument is capable of detecting the small shear stress forces produced when low-viscosity fluids are subjected to very low-shear rates. Instrument performance and sensitivity were evaluated using deionized water at temperatures between 10 and 75 °C. The measured water viscosity values differed from the literature values by less than 1%. The viscometer was also used to determine that the intrinsic viscosity of a poly(acrylamide) aqueous solution at 29 °C was 17.7 dL/g. This value was in agreement with the value obtained using a Contraves Low-Shear 30 cup and bob rheometer, 17.9 dL/g.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1529302