Experimental measurement of diffusion in aqueous polyvinylpyrrolidone solutions

Diffusivities of aqueous dilute and semidilute polyvinylpyrrolidone solutions Mw = 50,500 and Mw = 867,000 were measured at 25°C. The measurements were performed by Taylor's hydrodynamic stability method and the dynamic light scattering (DLS) method. Taylor's method was compared to DLS and...

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Bibliographic Details
Published in:AIChE journal 1995-04, Vol.41 (4), p.812-818
Main Authors: Metaxiotou, Zoe A., Nychas, Stavros G.
Format: Article
Language:English
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Summary:Diffusivities of aqueous dilute and semidilute polyvinylpyrrolidone solutions Mw = 50,500 and Mw = 867,000 were measured at 25°C. The measurements were performed by Taylor's hydrodynamic stability method and the dynamic light scattering (DLS) method. Taylor's method was compared to DLS and evaluated as an experimental technique to determine the molecular diffusivity in polymer solutions. The agreement between the two methods was very good with Taylor's method proving to be a reliable, simple, and inexpensive technique that provided diffusivity data with a maximum error of 5%.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690410408