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dc.contributor.authorJoseph, R.*
dc.contributor.authorMartyn, Michael T.*
dc.contributor.authorTanner, K.E.*
dc.contributor.authorCoates, Philip D.*
dc.contributor.authorBonfield, W.*
dc.date.accessioned2009-12-09T16:38:12Z
dc.date.available2009-12-09T16:38:12Z
dc.date.issued2001
dc.identifier.citationJoseph, R., Martyn, M. T., Tanner, K. E., Coates, P. D. and Bonfield, W. (2001). Rheological characterisation of hydroxyapatite filled polyethylene composites. Part 1 ¿ Shear and extensional behaviour. Plastics, Rubber and Composites, Vol. 30, No. 5, pp. 197-204(8).en
dc.identifier.urihttp://hdl.handle.net/10454/4044
dc.descriptionnoen
dc.description.abstractThe shear and extensional properties of injection moulding grade hydroxyapatite¿polyethylene composites developed for orthopaedic applications have been studied. The composite was prepared without processing aids owing to concerns over the potential biological responses to such additives. The composite containing 20 vol.-% hydroxyapatite filler showed typical pseudoplastic behaviour. However, that containing 40 vol.-% hydroxyapatite filler tended to exhibit yield. The Maron¿Pierce equation was found to be useful in predicting the viscosities of the composite systems. The activation energy of the composite and the unfilled polymer were equal, indicating that the 20 vol.-% system exhibits the same flow mechanism as the unfilled polymer. A qualitative assessment of extensional properties was made following Cogswell's method. The extensional stress of the unfilled polymer decreases with increasing temperature whereas the composites behave in a complex manner. For all the systems the Trouton ratios tend to increase with apparent shear rates. The Trouton ratio also indicates that at higher temperatures the flow of these composites is dominated by extensional properties.en
dc.language.isoenen
dc.publisherManeyen
dc.subjectHydroxyapatite¿polyethylene compositesen
dc.subjectOrthopaedic applicationsen
dc.subjectShearen
dc.subjectExtensional propertiesen
dc.titleRheological characterisation of hydroxapatite filled polyethylene composites. Part I - Shear and extensional behaviour.en
dc.status.refereedYesen
dc.typeArticleen
dc.type.versionpublished version paperen
dc.identifier.doihttps://doi.org/10.1179/146580101101541624


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