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Synthesis of Hydrophobically modified ethoxylated non-isocyanate urethanes (HENIURs) and their use as rheology additives

Abstract : Telechelic associative polymers such as Hydrophobically modified ethoxylated urethanes (HEURs) are an important class of rheology additives used in many industrial fields allowing a precise control of the rheology. To avoid the use of toxic isocyanates, more eco-friendly HEURs were synthesized based on the cyclo-carbonate/amine addition reaction. Hydrophobically modified ethoxylated hydroxyurethanes (HEHURs) were thus obtained by the aminolysis of telechelic 5-membered cyclic carbonates functionalized PEG in the presence of hydrophobic amines of 14, 16 and 18 carbons. The rheological properties (G', G'' and η*) of these amphiphilic structures were investigated, as well as the influence of different parameters such as: temperature (5 to 25 °C), concentration (10 to 20 wt%) and hydrophobic chain length. Their rheological properties were also compared to isocyanate-based equivalent structures (HEURs). Finally, HEHURs were used in latex solution to illustrate their potential use as rheology additives and their thickening efficiency at 0.25 wt%. Mainly Newtonian to fully pseudoplastic profiles were obtained depending on the variation of the hydrophobic chain length.
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https://hal.archives-ouvertes.fr/hal-03706671
Contributor : Sylvain Caillol Connect in order to contact the contributor
Submitted on : Monday, June 27, 2022 - 11:25:17 PM
Last modification on : Friday, August 5, 2022 - 10:59:30 AM

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Baptiste Quienne, Julien Pinaud, Sylvain Caillol. Synthesis of Hydrophobically modified ethoxylated non-isocyanate urethanes (HENIURs) and their use as rheology additives. European Polymer Journal, Elsevier, 2022, 175, pp.111384. ⟨10.1016/j.eurpolymj.2022.111384⟩. ⟨hal-03706671⟩

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