Sender, Cyril and Dantras, Eric and Laffont-Dantras, Lydia and Lacoste-Ferré, Marie-Hélène and Dandurand, Jany and Mauzac, Monique and Lacout , Jean-Louis and Lavergne, Claudine and Demont, Philippe and Bernès, Alain and Lacabanne, Colette Dynamic Mechanical Properties of a Biomimetic Hydroxyapatite/Polyamide 6,9 Nanocomposite. (2007) Journal of Biomedical Materials Research Part B: Applied Biomaterials, vol. 83B (n° 2). pp. 628-635. ISSN 1552-4973
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Official URL: http://dx.doi.org/10.1002/jbm.b.30930
A biomimetic composite of nanohydroxyapatite (nHap) and semicrystalline polyamide 6,9 (PA 6,9) was synthesized by thermally induced phase separation. The nHap powder was dispersed in a polymer matrix with a low ratio ranging 1–10 wt %. The mean size of the nHap, determined by scanning electron microscopy (SEM) was 100–200 nm (length), 40–60 nm (width). Physicochemical analyses were performed in order to characterize the PA 6,9 and nHap separately on the one hand, and the PA 6,9/nHap composites on the other hand. Differential scanning calorimetry (DSC) and dynamic mechanical analyses (DMA) have pointed out an optimization of the composite physical properties as a function of nHap content till a limit value of 5 wt %. Above this value, the mechanical properties decreased. Four main parameters have been found to influence the composite physical properties improvement: the fillers content, the physical structure of the polymeric matrix, the particles dispersion and the physical interaction strength between organic and inorganic phases. The dynamic mechanical properties of this biomimetic nanocomposite were compared with human cortical bone.
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