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Dynamic mechanical properties of a biomimetic hydroxyapatite/polyamide 6,9 nanocomposite

✍ Scribed by C. Sender; E. Dantras; L. Dantras-Laffont; M. H. Lacoste; J. Dandurand; M. Mauzac; J.-L. Lacout; C. Lavergne; Ph. Demont; A. Bernès; C. Lacabanne

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
348 KB
Volume
83B
Category
Article
ISSN
1552-4973

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✦ Synopsis

Abstract

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. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007

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