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Rheological Characterization of Carbopol® Dispersions in Water and in Water/Glycerol Solutions

Department of Mechanical Engineering, Pontifícia Universidade Católica-RJ, Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22453-900, Brazil
Author to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 27 December 2018 / Accepted: 2 January 2019 / Published: 4 January 2019
(This article belongs to the Special Issue Advances in Experimental and Computational Rheology)
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The influence of the solvent type on the rheological properties of Carbopol ® NF 980 dispersions in water and in water/glycerol solutions is investigated. The material formulation, preparation procedure, common experimental challenges and artifact sources are all addressed. Transient and steady-state experiments were performed. For both solvent types, a clearly thixotropic behavior occurs slightly above the yield stress, where the avalanche effect is observed. For larger stresses, thixotropy is always negligible. Among other findings, it is observed that, for a given Carbopol concentration, the dispersion in the more viscous solvent possesses a lower yield stress and moduli, a larger power-law index, and a longer time to reach steady state. View Full-Text
Keywords: Carbopol; yield stress; thixotropy Carbopol; yield stress; thixotropy

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R. Varges, P.; M. Costa, C.; S. Fonseca, B.; F. Naccache, M.; De Souza Mendes, P.R. Rheological Characterization of Carbopol® Dispersions in Water and in Water/Glycerol Solutions. Fluids 2019, 4, 3.

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