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Relation between steady shear flow and dynamic rheology

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Summary

The relationships between steady shear flow and dynamic rheology are investigated at relatively high shear rates and frequencies. A useful empirical relationship in this region predicts that the magnitude of the complex dynamic viscosity |η *| should be compared with the shear viscosityη at equal values of frequency and shear rate (Cox-Merz-rule). Polystyrenes (PS) and Polyacrylamides (PAAm) have been investigated over a wide range of concentration and molecular weight. Only in case of PAAm/H2O solutions we have found that the results do not coincide with Cox-Merz-rule. As far as we know this is the first time that deviations from Cox-Merz-rule were observed in a homogeneous system. A molecular interpretation is given.

Zusammenfassung

Die Beziehung zwischen der Scherviskosität und der komplexen (dynamischen) Viskosität bei relativ hohen Schergeschwindigkeiten und Frequenzen wurde untersucht. Eine geeignete empirische Beziehung in diesem Bereich sagt aus, daß der Betrag der komplexen Viskosität |η *| mit der Scherviskositätη bei gleichen Werten von Frequenz und Schergeschwindigkeit vergleichbar ist (Cox-Merz-Regel). Polystyrole (PS) and Polyacrylamide (PAAm) wurden über einen weiten Bereich der Konzentration und des Molekulargewichts untersucht. Nur im Fall der PAAm/H2O-Lösungen wurden Abweichungen von der Cox-Merz-Regel gefunden. Soweit uns bekannt, ist es das erste Mal, daß Abweichungen von der Cox-Merz-Regel in einem homogenen System gefunden wurden. Eine molekulare Erklärung wird gegeben.

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Authors and Affiliations

  1. Institut für Chemische Technologie, Technische Universität Braunschweig, Hans-Sommer-Str. 10, D-3300, Braunschweig, FRG

    W. -M. Kulicke

  2. Polymer Science and Engineering Department Materials Research Laboratory, University of Massachusetts, 01003, Amherst, MA, USA

    R. S. Porter

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  1. W. -M. Kulicke
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  2. R. S. Porter
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Kulicke, W.M., Porter, R.S. Relation between steady shear flow and dynamic rheology. Rheol Acta 19, 601–605 (1980). https://doi.org/10.1007/BF01517513

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