The grafting reaction of MMA onto hydroxyapatite has been studied with the pre-irradiation method in air. The effects of radiation dose

monomer concentration

reaction temperature and inorganic acid on the system are observed. The grafting copolymerization is found to be controlled by the billetics. If proper kinetic conditions are selected

a better grafting yield can be obtained. Employing weight method

burning method as well as SEM and IR analysis

it has been proved that MMA is definitely grafted onto hydroxyapatite by chemical bonds

which shows that it is possible to improve the interface of inorganic-organic composite meterials and to make bioactive ceramics by using radiation induced-grafting copolymerization.