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Titolo:
Rheological characterisation of hydroxyapatite filled polyethylene composites Part 1 - Shear and extensional behaviour
Autore:
Joseph, R; Martyn, MT; Tanner, KE; Coates, PD; Bonfield, W;
Indirizzi:
Univ London Queen Mary & Westfield Coll, IRC Biomed Mat, London E1 4NS, England Univ London Queen Mary & Westfield Coll London England E1 4NS S, England Univ Bradford, IRC Polymer Sci & Technol, Bradford BD7 1DP, W Yorkshire, England Univ Bradford Bradford W Yorkshire England BD7 1DP , W Yorkshire, England
Titolo Testata:
PLASTICS RUBBER AND COMPOSITES
fascicolo: 5, volume: 30, anno: 2001,
pagine: 197 - 204
SICI:
1465-8011(2001)30:5<197:RCOHFP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMER MELTS; CARBON-BLACK; ELONGATIONAL PROPERTIES; CALCIUM-CARBONATE; POLYSTYRENE MELTS; TITANIUM-DIOXIDE; EXTRUSION; FLOW; REPLACEMENT; VISCOSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Joseph, R Univ London Queen Mary & Westfield Coll, IRC Biomed Mat, Mile End Rd, London E1 4NS, England Univ London Queen Mary & Westfield Coll Mile End Rd London England E1 4NS
Citazione:
R. Joseph et al., "Rheological characterisation of hydroxyapatite filled polyethylene composites Part 1 - Shear and extensional behaviour", PLAS RUB C, 30(5), 2001, pp. 197-204

Abstract

The 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 20vol.-% hydroxyapatite filler showed typical pseudoplasticbehaviour. However, that containing 40 vol.-% hydroxyapatite filler tendedto 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'smethod. 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 ofthese composites is dominated by extensional properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:42:12