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The inorganic-organic hybrids have interesting applications resulting from the combination of some characteristic properties of the inorganic substrate (mechanical and chemical properties, exchange capacity, bioreactivity, optical properties...) with those of the organic grafting (polymerizability, superficial tension...). Such modified materials are used in catalysis, chromatography, biomedical domain... A suspension of calcium hydroxyapatite Ca10(PO4)(OH)2 was treated by the different alkylphosphonates (R-POCl2, R= methyl or octyl) in organic solvent using a molar ratio x=2 or 4, x=n(organic)/ n(apatite). The surface of the modified CaHAp was characterized using X-ray diffraction, IR and 31P MAS-NMR spectroscopies, chemical analysis and Atomic Force Microscopy (AFM). No remarkable change in XRD patterns was observed after grafting. FTIR results indicated that new vibration modes related to phosphonate groups appear essentially at 2930, 1315, 945, 764 and 514 cm-1. The 31P MAS-NMR spectra of treated hydroxyatite show new signals due to the formation of organic –inorganic bonds in the surface between the superficial hydroxyl groups of the apatite (≡CaOH and ≡POH) and alkyl phosphonic dichloride. AFM proved that the texture surface was changed and roughness decreased. The number of phosphonate groups grafted, in the modified materials, was calculated from chemical analysis results.

Surface modification of hydroxyapatite by grafting alkyl phosphonic dichloride