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Effect of Ethanol on the Rheological Properties of Water-Rich Gels of Diblock Copolymer E43B11

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Kelarakis, Antonis, Havredaki, Vasiliki and Booth, Colin (2004) Effect of Ethanol on the Rheological Properties of Water-Rich Gels of Diblock Copolymer E43B11. Macromolecular Chemistry and Physics, 205 (12). pp. 1594-1601. ISSN 1022-1352

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Official URL: http://dx.doi.org/10.1002/macp.200400097

Abstract

The effect of added ethanol on the rheological behaviour of aqueous solutions of diblock copolymer E43B11 (E = oxyethylene unit, B = oxybutylene unit) has been investigated. Thermally reversible sol-gel transitions were observed for concentrated solutions of the copolymer in solutions containing 0–30 wt.-% ethanol. Storage (G′) and loss (G″) moduli and yield stress (σy) were used to define hard and soft gel phases. The introduction of 10 wt.-% ethanol did not alter the phase behaviour greatly, whereas higher ethanol concentrations had a large effect, which differed in kind from that reported for triblock copolymers of ethylene oxide and propylene oxide, type EPE.

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