Image icon  Fracture surface in a liquid crystalline polymer

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Description: Above their melting point, liquid crystalline polymers exhibit a mesophase within which, although able to flow and are not arranged in a crystal, they exhibit long range orientational order. This molecular alignment can be exploited to make high strength and stiffness fibres such as Kevlar, or even mouldable thermotropics such as Vectra. Molecular alignment can also be controlled by an external applied field; a property exploited in liquid crystal displays. This specimen has not had a magnetic field applied to it and it exhibits only local molecular self-alignment, without any overall orientation alignment. It is to be compared with a similar sample which has been subjected to a magnetic field of 1.1T for one hour and in which there is a high level of fibrillar alignment.
Keywords: alignment • fibre • fibrillation • fracture • liquid crystalline polymer (LCP) • lyotropic • magnetic • nematic • polymer
Categories: Science approaches > Deformation & failure > Fracture
Science approaches > Microstructure
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: 1675