Surface Modification of Nano-Hydroxyapatite with Silane Agent
硅烷偶联剂对纳米羟基磷灰石表面改性的研究

Nano-hydroxyapatite (n-HA) was modified by using silane coupling reagent (KH-560), and the interfacial interactions between n-HA and KH-560 was also studied. Fourier transform infrared spectra (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 2-4 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 distribute in the PC matrix. The results indicate that the interfacial interaction between surface-modified inorganic particles and polymer matrix is crucial for the improvement of the mechanical strength of the composites.