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Issue 9, 2010
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Dynamics of shear-induced orientation transitions in block copolymers

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Abstract

This research investigates the dynamics of mechanical and structural transformations of styrenebutadienestyrene block copolymer, known as RCM1, which has cylindrical mesophase morphology. The polymer was processed using a Multipass Rheometer (MPR) with simultaneous X-ray observation. The method allowed investigation of the dynamics with 1 second time resolution. Samples were processed at 160 °C and an apparent wall shear rate in the range ∼1.4 to 1125 s−1. Microstructural alignment was quantified using a second order X-ray orientation function. The polymer showed self-organization in the melt, aligning along the capillary walls. Shear flow disrupted the organization, which then rebuilt during the post-shearing pause, as the residual pressure relaxed across the capillary. The dynamics of structure ordering and disordering was a function of shear rate. The transition was faster for high shear rate cycles.

Graphical abstract: Dynamics of shear-induced orientation transitions in block copolymers

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Publication details

The article was received on 15 Jan 2010, accepted on 02 Mar 2010 and first published on 22 Mar 2010


Article type: Paper
DOI: 10.1039/C000975J
Citation: Soft Matter, 2010,6, 1941-1947

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    Dynamics of shear-induced orientation transitions in block copolymers

    J. Stasiak, M. R. Mackley, A. M. Squires, V. Castelletto, I. W. Hamley and G. D. Moggridge, Soft Matter, 2010, 6, 1941
    DOI: 10.1039/C000975J

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