In this paper,unsaturated double bond functional group was chemically inserted onto the surface of hydroxypatite particles by esterification reaction with methacrylic acid,then UV irradiation polymerization reaction of methacrylic acid onto the surface of hydroxypatite particles was taken place in situ.ESCA,FTIR,particle size analysis and SEM tests showed that the surfaces of hydroxypatite particles were successfully free-radical polymerized with methacrylic acid,the average particle size increased greatly as compared with that of pure hydroxypatite particles.
