Abstract
The association behaviors of hydrophobically modified urethane ethoxylate polymer (HEUR) in ethylene glycol−water mixtures were studied by laser light scattering and rheological techniques. The ratio, Rg/Rh decreases from 1.5 to 1.1 when ethylene glycol (EG) concentration increases from 0 to 20 wt %. It then increases to ∼1.3 at EG of 30 wt % and decreases to 0.8 at EG of 70 wt %. When the molar ratio of ethylene glycol to water exceeds 1, HEUR precipitates from the solvent mixture. Addition of ethylene glycol to water produces a poor and less polar solvent mixture for HEUR, which decreases the aggregation number of the micellar core. It also lowers the solvation of HEUR chains, giving rise to a more compact chain conformation. The contribution of these two factors is responsible for the transformation of a flower to a starlike micelle. Shear-thickening behavior was observed for HEUR in water and in ethylene glycol−water mixtures, but the magnitude of the shear-thickening is reduced for solvent mixtures w...
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