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Transient shear flow properties of carbon fiber-filled liquid crystalline polymer

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dc.title Transient shear flow properties of carbon fiber-filled liquid crystalline polymer en
dc.contributor.author Araki, Katsuhiko
dc.contributor.author Kitano, Takeshi
dc.contributor.author Lengálová, Anežka
dc.contributor.author Sáha, Petr
dc.relation.ispartof Polymer Composites
dc.identifier.issn 0272-8397 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2005-08
utb.relation.volume 26
utb.relation.issue 4
dc.citation.spage 470
dc.citation.epage 476
dc.type article
dc.language.iso en
dc.publisher John Wiley & Sons, Inc. en
dc.identifier.doi 10.1002/pc.20120
dc.relation.uri http://onlinelibrary.wiley.com/doi/10.1002/pc.20120/abstract
dc.subject Carbon fibers en
dc.subject Extrusion molding en
dc.subject Fillers en
dc.subject Shear flow en
dc.subject Strain en
dc.subject Transients en
dc.subject Unsteady flow en
dc.subject Carbon fiber-filled liquid crystals en
dc.subject Ramp point delay time en
dc.subject Shear thickening en
dc.subject Transient shear flow en
dc.subject Liquid crystal polymers en
dc.description.abstract Unsteady flow of filled polymer systems can cause some difficulties in their processing, such as injection or extrusion molding, in which flow in the molten state is involved. In order to determine the optimum conditions and thus improve the performance of the end products, it is necessary to understand the transient/unsteady flow behavior of these systems. In a previous work, we found remarkable non-Newtonian properties and shear thickening flow behavior of liquid crystalline polymers (LCP) and their filled systems. This article deals with the dependence of transient flow properties, including shear thickening, of pure and carbon fiber-filled LCP upon the shear rate and shear strain history; the effect of the filler content is also discussed. The results indicate that the abnormal flow behavior of the tested materials may be caused by gradual disintegration of the domain structure formed in LCP (materials exhibit apparent yield stress) and then continual orientation of molecules under shear flow. The shear thickening behavior of the materials seems to disappear with increasing fiber content. This behavior suggests that it is necessary to measure the flow properties under a sufficient ramp point delay time and equilibration time in order to obtain reliable data under stable conditions. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1002062
utb.identifier.scopus 2-s2.0-27644527509
utb.identifier.wok 000231252200007
utb.identifier.coden PCOMD
utb.source j-wok
dc.date.accessioned 2011-08-16T15:06:19Z
dc.date.available 2011-08-16T15:06:19Z
utb.contributor.internalauthor Lengálová, Anežka
utb.contributor.internalauthor Sáha, Petr
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