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Rheologica Acta

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01-12-2008 | Original Contribution

Shear and elongational flow behavior of acrylic thickener solutions

Part I: Effect of intermolecular aggregation

Authors: Saeid Kheirandish, Ilshat Guybaidullin, Wendel Wohlleben, Norbert Willenbacher

Published in: Rheologica Acta | Issue 9/2008

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Abstract

We investigate the effect of hydrophobic aggregation in alkali-swellable acrylic thickener solutions on shear and extensional flow properties at technically relevant polymer concentrations using the commercial thickener Sterocoll FD as model system. Apparent molecular weight of aggregates in water is M_w ≈ 10⁸ g/mol and decreases by more than an order of magnitude in ethanol. Zero shear viscosity η ₀ is low and shear thinning is weak compared to the high molecular weight of the aggregates. Linear viscoelastic relaxation is described by the Zimm theory up to frequencies of 10⁴ rad/s, demonstrating that no entanglements are present in these solutions. This is further supported by the concentration dependence of η ₀ and is attributed to strong association within the aggregates. Extensional flow behavior is characterized using the capillary break-up extensional rheometry technique including high-speed imaging. Solutions with ϕ ≥ 1% undergo uniform deformation and show pronounced strain hardening up to large Hencky strains. Elongational relaxation times are more than one order of magnitude lower than the longest shear relaxation times, suggesting that aggregates cannot withstand strong flows and do not contribute to the elongational viscosity.

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Private communication Y. Matter, BASF SE, ISIS Laboratory, Straßbourg.

It should be noted that the low σ value even for the pure aqueous solution is due to the presence of surfactants from the emulsion polymerization process.

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Title: Shear and elongational flow behavior of acrylic thickener solutions
Part I: Effect of intermolecular aggregation
Authors: Saeid Kheirandish
Ilshat Guybaidullin
Wendel Wohlleben
Norbert Willenbacher
Publication date: 01-12-2008
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 9/2008
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-008-0292-1

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