Image icon  Twist-escaped loops in the liquid crystalline polymer MBBA

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Description: Once a weak shear flow is applied on the nematic liquid, there is a sudden and strong increase in the defect density. At a certain shear rate, the equilibrium density is reached after a while through the creation and annihilation of defects. This in-situ observation enables the study of a wide range of dynamic disclination behaviours during shear, such as disclination-joining, loop-contracting, loop-stretching and loop-breaking. The loops in this image result from type 1 disclinations 'escaping' into three-dimensions by twist.
Keywords: defect • escape • liquid crystalline polymer (LCP) • loop • polymer • shear
Categories: Science approaches > Microstructure
Materials > Polymers & elastomers
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
Prof A H Windle, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 03 October 2002
Date added: 21 August 2009
Resource ID: 1672