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Rheologica Acta

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01.08.2012 | Original Contribution

Microsecond relaxation processes in shear and extensional flows of weakly elastic polymer solutions

verfasst von: Damien C. Vadillo, Wouter Mathues, Christian Clasen

Erschienen in: Rheologica Acta | Ausgabe 8/2012

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Abstract

In this paper, we introduce an experimental protocol to reliably determine extensional relaxation times from capillary thinning experiments of weakly elastic dilute polymer solutions. Relaxation times for polystyrene in diethyl phthalate solutions as low as 80 μ s are reported: the lowest relaxation times in uniaxial extensional flows that have been assessed so far. These data are compared to the linear viscoelastic relaxation times that are obtained from fitting the Zimm spectrum to high frequency oscillatory squeeze flow data measured with a piezo-axial vibrator (PAV). This comparison demonstrates that the extensional relaxation time reduced by the Zimm time, λ _ext/λ _z, is not solely a function of the reduced concentration c/c*, as is commonly stated in the literature: an additional dependence on the molecular weight is observed.

Vorheriger Artikel Use of ram extruder as a combined rheo-tribometer to study the behaviour of high yield stress fluids at low strain rate

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Titel: Microsecond relaxation processes in shear and extensional flows of weakly elastic polymer solutions
verfasst von: Damien C. Vadillo
Wouter Mathues
Christian Clasen
Publikationsdatum: 01.08.2012
Verlag: Springer-Verlag
Erschienen in: Rheologica Acta / Ausgabe 8/2012
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-012-0640-z

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