Surface Modification of Nano-Hydroxyapatite with Silane Agent

Nano-hydroxyapatite (n-HA) was modified by using silane coupling reagent (KH-560),and the interracial interactions between n-HA and KH-560 was also studied.Fourier transform infrared spec- tra (FT-IR) and X-ray photoelectron spectra (XPS) analyses show that the silane coupling molecular binds strongly to n-HA surface.Chemical bonding (Si-O-P) is formed by the reaction between Si-OH and HPO_4~(2-) group,and a similar interface effect exists between Si-OH and the hydroxyl group of HA. Surface modification of HA particles can improve the mechanical strength of the n-HA/polycarbonate (n-HA/PC) composites dramatically.SEM observation shows that modified HA particles uniformly dis- tribute in the PC matrix.The results indicate that the interracial interaction between surface-modified inorganic particles and polymer matrix is crucial for the improvement of the mechanical strength of the composites.