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A simple experiment to determine the activation energy of the viscous flow of polymer solutions using a glass capillary viscometer

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dc.contributor.author Rohindra, D.R.
dc.contributor.author Lata, R.A.
dc.contributor.author Coll, Richard K.
dc.date.accessioned 2012-10-04T01:57:53Z
dc.date.available 2012-10-04T01:57:53Z
dc.date.copyright 2012-09-01
dc.date.issued 2012
dc.identifier.citation Rohindra, D. R., Lata, R. A., & Coll, R. K. (2012). A simple experiment to determine the activation energy of the viscous flow of polymer solutions using a glass capillary viscometer. European Journal of Physics, 33(5), 1457-1464. en_NZ
dc.identifier.issn 0143-0807
dc.identifier.issn 1361-6404
dc.identifier.uri http://hdl.handle.net/10289/6679
dc.description.abstract A simple viscometry experiment undertaken by an undergraduate polymer class as a research project is described. Viscosity is a measure of a fluid's resistance to flow and is affected by several factors, such as concentration and temperature. In this experiment, the viscosities of polyvinylpyrrolidone solutions (a polymeric material) of different concentrations were prepared in water and measured at various temperatures. The solution viscosity was found to increase gradually with increasing concentration up to similar to 5 mass%, with a dramatic increase after this. The calculated viscosity of water at different temperatures was comparable to reported values. The activation energy of viscous flow (E-a) of the different solutions was calculated and followed a similar trend as that for the viscosities of solutions of various concentrations. This experiment allowed students to better understand and explain the behaviour of macromolecules with respect to changing concentration and temperature. Furthermore, students correlated the viscosity and E-a results to understand how an increase in the concentration of a polymer solution resulted in increased entanglement of the polymer chains, consequently leading to an increase in viscosity and an increase in the activation energy of viscous flow. This experiment is safe, low cost, simple and requires only readily available apparatus. en_NZ
dc.language.iso en
dc.publisher Institute of Physics en_NZ
dc.relation.ispartof European Journal of Physics
dc.title A simple experiment to determine the activation energy of the viscous flow of polymer solutions using a glass capillary viscometer en_NZ
dc.type Journal Article en_NZ
dc.identifier.doi 10.1088/0143-0807/33/5/1457 en_NZ


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