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  • 1
    Electronic Resource
    Electronic Resource
    Threshold-type shear-thickening in polymeric solutions (1986)
    Springer
    Rheologica acta 25 (1986), S. 570-579 
    Details
    ISSN: 1435-1528
    Keywords: Polymer solution ; shear-thickening ; conformational transition ; shearinduced structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Threshold-type shear-thickening has been reported in the literature for relatively complex mixtures and one of the most famous is a solution of poly(vinylalcohol) in water in which a substantial amount of sodium borate is added. As far as we know, relatively few polymer solutions have been shown to be shear-thickening, even less of the threshold type. Two cases of threshold-type shear-thickening are examined. One of them is reversible [HPAM Pusher 700 or partially hydrolyzed poly(acrylamide) aqueous solution], the other one (in vitro-synthesized native dextran aqueous solution) leads to the formation of an irreversible structure provided sufficient strain is applied. In both cases, the occurrence of shear-thickening above a critical value of shear rate is related with a change in macromolecular conformation. This conformational change (reversible) can be followed by the formation of intermolecular bonds (irreversible).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01358165
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  • 2
    Electronic Resource
    Electronic Resource
    End effects for highly elastic-constant viscosity fluids (1986)
    Springer
    Rheologica acta 25 (1986), S. 95-101 
    Details
    ISSN: 1435-1528
    Keywords: End effect ; elastic-constant viscosity fluid ; Boger fluid ; primary normalstress difference ; shear-thinning properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In the light of a new interpretation, we have studied the end effects for highly elastic-constant viscosity fluids commonly called Boger fluids. In terms of entrance effect only, the presence of primary normal-stress differences in absence of shear-thinning properties results in a decrease of the entrance correction below the Couette (Newtonian) value, whereas the total end correction can be substantially increased by an amount which is strongly dependent on the Weissenberg number or recoverable shear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332128
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    Paper (German National Licenses)
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