Effect of Ethanol on the Rheological Properties of Water‐Rich Gels of Diblock Copolymer E 43 B 11 | Zendy

Kelarakis Antonis | Zendy; Havredaki Vasiliki | Zendy; Booth Colin | Zendy

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Effect of Ethanol on the Rheological Properties of Water‐Rich Gels of Diblock Copolymer E 43 B 11

Author(s) -

Kelarakis Antonis,

Havredaki Vasiliki,

Booth Colin

Publication year - 2004

Publication title -

macromolecular chemistry and physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.57

H-Index - 112

eISSN - 1521-3935

pISSN - 1022-1352

DOI - 10.1002/macp.200400097

Subject(s) - copolymer , dynamic mechanical analysis , ethylene oxide , rheology , ethanol , dynamic modulus , propylene oxide , materials science , polymer chemistry , aqueous solution , yield (engineering) , chemical engineering , chemistry , composite material , organic chemistry , polymer , engineering

Summary: The effect of added ethanol on the rheological behaviour of aqueous solutions of diblock copolymer E 43 B 11 (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 ( σ y ) 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.Temperature dependence of the logarithm of (•) storage and (○) loss modulus for 20 wt.‐% copolymer in 10 wt.‐% ethanol.

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