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Article Dans Une Revue Polymer Année : 2017

A microrheological study of physical gelation of hydrophobically modified associating polymers: Effects of temperature

Résumé

The rheological properties of aqueous solutions of a hydrophobically modified poly(acrylic acid) were studied by diffusing-wave spectroscopy microrheology at various concentrations and temperatures and the formation of the transient network by hydrophobic association of the polymer chains was characterized. The Winter-Chambon power-law regime was found in a high frequency range accessible by microrheology, the physical gel point was successfully determined from the uniqueness of loss tangent, confirmed by the time-cure superposition of the mean-square displacement of the probe particles whose shift factors showed the critical power-law behaviors as a function of the relative distance from the gel point. The zero-shear viscosity as a function of the polymer concentration showed a plateau near the microrheologically determined gel point, indicating the presence of clusters which break before relaxing thus are rheologically undetectable. The largest relaxed cluster size was estimated to be 40 - 60 nm depending of the temperature. (C) 2017 Elsevier Ltd. All rights reserved.
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hal-01584149 , version 1 (08-09-2017)

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Marouen Zammali, Hasna Mahjoub, Mohamed Hanafi, Guylaine Ducouret, Tahar Othman, et al.. A microrheological study of physical gelation of hydrophobically modified associating polymers: Effects of temperature. Polymer, 2017, 121 (19), pp.204 - 210. ⟨10.1016/j.polymer.2017.06.022⟩. ⟨hal-01584149⟩
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