Preparation and characterization of hydroxyapatite/polyacrylonitrile photografting composite film

The aim of this study is to improve the interface compatibility between hydroxyapatite and polyacrylonitrile in the composite.Surface modification of hydroxyapatite using acrylic acid is performed.The composite film is prepared via phografting the modified hydroxyapatite containing unsaturated double bond onto the polyacrylonitrile which is compared with the blended film.The modified hydroxyapatite and modified hydroxyapatite/polyacrylonitrile comoposite films are characterized using Fourier transform infrared spectroscopy,scanning electron microscopy and differential thermal analysis.The appearance of —C-O vibration peak at 1 631 cm-1 confirms the surface modification of hydroxyapatite via esterification of hydroxyapatite and acrylic acid.Well-dispersed nanoscale particles of the modified hydroxyapatite are embedded in polyacrylonitrile substrate.The tensile strength of polyacrylonitrile/modified hydroxyapatite photografting composite film is higher than the blended one except the adsorption capacity.