Abstract:The hydroxyapatite (HAP) modified by dimer acid was prepared in different solvents under different technology conditions by using C36 dimer acid and porous hydroxyapatite as raw materials. The structure of the modified hydroxyapatites was characterized by Fourier transform infrared spectrum analyzer (FTIR), laser particle analyzer, Bet surface area analyzer (BET) and scanning electron microscope (SEM). The progress of reaction was estimated by thermogravimetric (TG) ananlysis. The results show that the porous hydroxyapatite modified by dimer acids can be obtained at the reaction temperature of 105~110 ℃, the dosage mass ratio of C36 dimer acid to porous hydroxyapatite of 1∶1 and in the solvent of ethanol for 3.5~4.0 h. Under the above reaction conditions, the progress of the reaction was estimated by 36% or so. The dimer acids are on the surface and in the pore structure of hydroxyapatite which results in the decrease of the porosity of HAP. After the modification by dimer acids, the particle size of HAP decreases from 4.149 μm to 3.595 μm. And the BET specific surface area of HAP decreases from 60.6 to 28.0 m2·g-1.
