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Issue 19, 2012
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Shear-induced onion formation of polymer-grafted lamellar phase

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We study the shear-induced lamellar/onion transformation of the polymer-grafted lamellar phase composed of nonionic surfactant and amphiphilic triblock copolymers. Increase in the mole fraction of polymer XP and the degrees of polymerization of hydrophilic chain NEO remarkably affects the shear-induced onion phase formation behavior. From the viewpoint of the defect-mediated rheology, the shear modulus G′ is attributed to the oily streak network density. Linear increase in G′ with preshear rate prior to the onion formation indicates that the increase in the oily streak network density is essential as a pretransition. The oily streak is composed of the focal conic domains (FCDs), which locally have inhomogeneous layer spacing. The critical shear stress σc is well scaled by the effective increment of the bending modulus theoretically predicted for the polymer-grafted membranes, ΔκXPN1.27EO. Experimental results suggest that the shear-induced onion phase is achieved by reorganizing the layer orientation of FCDs with the negative Gaussian curvature in order to eliminate the inhomogeneous layer spacing.

Graphical abstract: Shear-induced onion formation of polymer-grafted lamellar phase

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The article was received on 26 Sep 2011, accepted on 02 Mar 2012 and first published on 10 Apr 2012

Article type: Paper
DOI: 10.1039/C2SM06831A
Citation: Soft Matter, 2012,8, 5381-5390
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    Shear-induced onion formation of polymer-grafted lamellar phase

    S. Fujii, D. Mitsumasu, Y. Isono and W. Richtering, Soft Matter, 2012, 8, 5381
    DOI: 10.1039/C2SM06831A

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