With the rapid development of society and the progress of technology, organic-inorganic nanocomposite materials have been paid more concern by the scientific and public communities because they could have the combination properties of both organic polymers and inorganic compounds such as processing ability, toughness, low cost and heat resistance, antioxidation as well as good thermal and mechanical properties. Organic-inorganic nanocomposites have become one of the hot spots of materials

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... e 1-7 . Compared with conventional synthesis methods like physical blending, in this paper, organic-inorganic nanocomposite materials were synthesized using in situ copolymerization method. The inorganic nanoscale hydroxyapatite (Hap) of about 160 nm long with surface grafted with vinyl groups and vinylpyrrolidone monomers were mixed and undergone in situ free radical copolymerization. The thermal properties of Hap/ PVP nanocomposites were especially studyed. EXPERIMENTAL Calcium chloride, diammonium phosphate, cyclohexane, n-pentanol, TX-100, sodium bisulfate, hydroquinone, methacrylic acid, 1,4-dioxane, tetrahydrofuran, azobisisobutyronitrile (AIBN), N-vinyl pyrrolidone (NVP) were all analytical reagent. A mixture of NH4H2PO4 (0.3 mol/L) and CaCl2 (0.5 mol/L) was adjusted to pH 11 and heated at 120 ºC for 10 h in a A series of noval organic-inorganic nanocomposite materials of hydroxyapatite/poly(vinyl pyrrolidone) were synthesized by in situ copolymerization of modified inorganic nanoscale hydroxyapatite and poly(vinyl pyrrolidone). The hydroxyapatite/poly(vinyl pyrrolidone) nanocomposites were characterized by scanning electronic microscope, X-ray diffraction and Fourier transform infrared analysis. The thermogravimetric analysis and differential scanning calorimetry results showed that the thermal properties of hydroxyapatite/poly(vinyl pyrrolidone) nanocomposites were significantly improved compared with the mother poly(vinyl pyrrolidone) polymers.