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Temporal viscosity modulations driven by a pH sensitive polymer coupled to a pH-changing chemical reaction

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Abstract

The Formaldehyde-Sulfite (FS) and the Formaldehyde-Sulfite-Gluconolactone (FSG) systems are examples of complex chemical reactions accompanied by well-controlled variations in pH. While the FS system exhibits a clock behavior, in the FSG reaction, this mechanism is coupled with the hydrolysis of the gluconolactone which gives the possibility to show large temporal oscillations of pH in an open reactor. In this work, we show how these reactive systems, due to their organic nature, can be coupled with pH sensitive polymers, particularly with polyacrylic acid (PAA) to trigger temporal changes of viscosity. We characterize this coupled reactive system showing the effects of changes in the initial concentrations of the polymer and in the chemical reagents on the induction time, the magnitude of the pH variations and the temporal modifications of the viscosity.

Graphical abstract: Temporal viscosity modulations driven by a pH sensitive polymer coupled to a pH-changing chemical reaction

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Publication details

The article was received on 19 Jan 2017, accepted on 04 Apr 2017 and first published on 06 Apr 2017


Article type: Paper
DOI: 10.1039/C7CP00426E
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Temporal viscosity modulations driven by a pH sensitive polymer coupled to a pH-changing chemical reaction

    D. M. Escala, A. P. Muñuzuri, A. De Wit and J. Carballido-Landeira, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP00426E

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