Aspects of the rheological behaviour of polymer solutions in conditions of phase separation

Barsukov, I. A.; Yemel'yanov, D.N.; Kamskii, R. A.; Bobykina, N.S.

doi:10.1016/0032-3950(89)90495-4

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental evidence available to date is insufficient to provide detailed information regarding the shear-thickening mechanism present here; however, a brief examination of some of the possible causes is warranted. A number of authors − have investigated the role of flow-induced phase separations and concentration fluctuations on the rheological properties of polymer solutions. Studies such as Yanase et al and Moldenaers et al have observed drastic shear thickening and have attributed it to a transition in the direction of the alignment of concentration fluctuations from the vorticity axis to the flow axis.…”

Section: Resultsmentioning

confidence: 99%

High-Shear-Rate Behavior of Radial Hydrogenated Styrene−Isoprene and Block Ethylene−Propylene Copolymer Solutions

Erickson¹,

Li²,

White³

et al. 2001

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Using a capillary viscometry technique, the high-shear-rate behavior of two polymer additives (an ethylene−propylene block copolymer and a radial hydrogenated styrene−isoprene copolymer) in a hydrocarbon-based oil solution has been investigated. At mass concentrations of up to 2.0% for the styrene−isoprene copolymer and 1.5% for the ethylene−propylene additive, the viscosity was measured over a range of shear rates from 104 to 106 s-1. To correct for the effects of viscous heating and pressure changes, a numerical correction procedure is used which reduces the experimental results to viscosity data at a common reference temperature and pressure for comparison. Over the range of shear rates examined, the styrene−isoprene solutions exhibited typical shear-thinning behavior, becoming more dramatic at higher polymer concentrations. In addition to shear thinning at the higher shear rates, a shear-thickening region was observed in the more concentrated ethylene−propylene solutions. As the polymer concentration increased, the degree of shear thickening was shown to be more severe and the critical region was observed at lower shear rates.

show abstract