The porous structure and mechanical properties of injection molded HA/PA66 scaffolds / S. Zhou in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 4 (08/2014)

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 4 (08/2014) . - p. 454-460 Titre : The porous structure and mechanical properties of injection molded HA/PA66 scaffolds Type de document : texte imprimé Auteurs : S. Zhou, Auteur ; Y.-B. Li, Auteur ; Y.-Y. Wang, Auteur ; Y. Zuo, Auteur ; S.-B. Gao, Auteur ; M. Li, Auteur ; Li Zhang, Auteur Année de publication : 2014 Article en page(s) : p. 454-460 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites -- Propriétés mécaniques Echafaudages Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Matériaux poreux Mousses plastiques -- Moulage par injection Mousses plastiques -- Propriétés mécaniques Polyamide 66 Index. décimale : 668.4 Plastiques, vinyles Résumé : Hydroxyapatite/polyamide-66 (HA/PA66) composite scaffolds were prepared using injection-molding technique, and also analyzed by means of scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), Fourier transform infrared spectroscopy (FTIR) and mechanical testing. Compared with common methods including solvent casting/particulate leaching, phase separation and so forth to fabricate scaffolds, this process is of a rapid and convenient manner. The increase of HA content can increase the stiffness of composite scaffolds accompanied by the reduction of impact strength, pore size and porosity. The storage modulus of composite scaffolds increases with increasing HA content and with decreasing porosity. The damping (tan δ) of PA66 decreases with the increase of HA content, and the α and β relaxation peaks of PA66 for the foamed HA/PA66 composites slightly shift to lower value, indicating that both HA and gas in the foamed HA/PA66 composites have an effect on the chain mobility of the polymer and the interaction between the polymer chains. The microstructure of the 30 wt% and 40 wt% HA/PA66 composite scaffolds with porosity more than 59 % and pore size ranging from 100 to 500 μm is similar to that of dry human trabecular bone. The obtained composite scaffolds with 30 wt% and 40 wt% HA have a compressive modulus of 232 to 443 MPa, and a compressive strength of 9.3 to 9.8 MPa, similar to or a little higher than those of trabecular bone, and close to those of the cancellous bone. Note de contenu : - EXPERIMENTAL : Materials - Preparation of composite scaffolds - Morphology observations of composite scaffolds - Determination of the porosity of composite scaffolds - Mechanical testing of composite scaffolds - Dynamic mechanical measurement of composite scaffolds - Fourier-Transform Infrared Spectroscopy - Melt Fow Index (MFI) measurement of pure PA66 and HA/PA66 composites - RESULTS AND DISCUSSION : Infrared spectroscopic analysis - Effect of HA content on the mechanical properties and porosity - Effect of HA content on the porous structure - Dynamic mechanical properties DOI : 10.3139/217.2851 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21824 [article]

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