Study of gamma radiation effect on PMMA/HA composites prepared by solution

Research and development of new materials and methods for bone repair and substitution is today one priority in bone defects treatment. PMMA is the current standard for cement held prostheses, providing immediate structural support, being inert as well as compatible. In this study, PMMA/Hydroxyapatite (HA) composites prepared by solution and gamma irradiated were characterized. Inclusion of HA particles caused a decrease in Melt Flow Index while radiation originated an increase in this parameter as a consequence of a strong degradation. Filler provided an increase in Young Modulus and a decrease in strength and elongation at break due to elasticity loss. On the other hand, radiation caused a decrease in composites mechanical properties. Initial decomposition temperatures increased with filler content and low doses radiation. At higher doses, a decrease was noticed due to degradation. HA showed a stabilizing effect, the activation energy of filled irradiated and non irradiated materials were higher than unfilled ones.