HYDROXYAPATITE POLYETHYLENE COMPOSITES - EFFECT OF GRAFTING AND SURFACE-TREATMENT OF HYDROXYAPATITE

The mechanical properties of hydroxyapatite-polyethylene com posites h ave been im proved by increasing the interfacial bond between the hydr oxyapatite reinforcing particles and the polyethylene. Two types of su rface treatment have been investigated: both use silane coupling of th e hydroxyapatite, either with or without grafting of the polyethylene. These treatments have lead to the presence of a silicon-containing in terphase promoting chemical adhesion and penetration of the polymer in to cavities in the ceramic particles. The resultant bond has improved the mechanical properties and fracture behaviour of the composites.