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Titolo:
Relationship between processing and mechanical properties of injection molded high molecular mass polyethylene plus hydroxyapatite composites
Autore:
Reis, RL; Cunha, AM; Oliveira, MJ; Campos, AR; Bevis, MJ;
Indirizzi:
Univ Minho, Dept Polymer Engn, P-4800058 Guimaraes, Portugal Univ Minho Guimaraes Portugal P-4800058 n, P-4800058 Guimaraes, Portugal Brunel Univ, Wolfson Ctr Mat Proc, Uxbridge UB8 3PH, Middx, England BrunelUniv Uxbridge Middx England UB8 3PH bridge UB8 3PH, Middx, England
Titolo Testata:
MATERIALS RESEARCH INNOVATIONS
fascicolo: 5-6, volume: 4, anno: 2001,
pagine: 263 - 272
SICI:
1432-8917(200104)4:5-6<263:RBPAMP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
REINFORCED POLYETHYLENE; POLYPROPYLENE; ORIENTATION; POLYMERS; BONE;
Keywords:
biomaterials; hydroxyapatite; implants; mechanical properties; non-conventional; orthopedics; polyethylene; processing; scorim;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Reis, RL Univ Minho, Dept Polymer Engn, Campus Azurem, P-4800058 Guimaraes, Portugal Univ Minho Campus Azurem Guimaraes Portugal P-4800058 , Portugal
Citazione:
R.L. Reis et al., "Relationship between processing and mechanical properties of injection molded high molecular mass polyethylene plus hydroxyapatite composites", MAT RES INN, 4(5-6), 2001, pp. 263-272

Abstract

We apply a macromolecular-orientation approach to produce high molecular weight polyethylene (HMWPE) + hydroxyapatite (HA) ductile composites with the stiffness and strength within the range of human cortical bone. Our composites are produced with different amounts (10 to 50% by weight) of the reinforcement by two procedures: bi-axial rotating drum and twin screw extrusion (TSE). The processing is by conventional injection molding and by Scorim (shear controlled orientation in injection molding) under a wide range of processing windows. Tensile testing is performed and the corresponding performance related to the morphology evaluated by polarized light microscopy and scanning electron microscopy. The control of the processing parameters led to significant improvements of the tensile properties. Compounding by TSEand then processing by Scorim produces the maximum modulus of 7.4 GPa and the ductility as high as 19%, for the HA weight fraction of 30%. These mechanical properties match those of bone, and were obtained with much smaller amounts of HA reinforcement then has been previously reported in literature. Our PE + HA composites present the additional benefit of being ductile even for 50% HA amounts. The use Scorim is a unique way of inducing anisotropy to thick sections and to produce very stiff composites that may be used in biomedical applications with important mechanical loads. This fact, combined with the bioactive behavior of the HA phase, makes our composite usablefor orthopedic load-bearing implants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 11:28:55