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Issue 17, 1999
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Shear induced structures in lamellar phases of amphiphilic block copolymers

Abstract

The influence of shear on the mesoscopic structure in the lamellar region of ternary poly(ethylene oxide)–b-poly(propylene oxide)–b-poly(ethylene oxide) block copolymers PEO20–b-PPO70–b-PEO20 and PEO100–b-PPO70–b-PEO100 (Pluronic P123 and F127)/water/butanol systems was investigated by different techniques namely: small angle neutron and light scattering (SANS, SALS), as well as birefringence. A transition from parallel to perpendicular alignment of lamellae, with a corresponding decrease in the viscosity, was found with increasing shear rate at high block copolymer concentrations. However, a shear-induced formation of multilamellar vesicles (“onions’') was observed when the polymer concentration was reduced.

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Article type: Paper
DOI: 10.1039/A904014E
Phys. Chem. Chem. Phys., 1999,1, 3905-3910

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    Shear induced structures in lamellar phases of amphiphilic block copolymers

    J. Zipfel, J. Berghausen, G. Schmidt, P. Lindner, P. Alexandridis, M. Tsianou and W. Richtering, Phys. Chem. Chem. Phys., 1999, 1, 3905
    DOI: 10.1039/A904014E

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