γ-甲基丙烯酸丙酯基三甲氧基硅烷与n-HA的界面作用研究

Study on the interfacial interaction between γ-(trimethoxysilyl) propyl methacrylate and nano-apatite

用傅立叶红外光谱(FT IR)、激光拉曼光谱(Raman)和X光电子能谱(XPS)等技术研究了纳米羟基磷灰石(n HA)与γ甲基丙烯酸丙酯基三甲氧基硅烷(KH 570)偶联剂的界面作用。结果表明,用硅烷处理后的n HA 表面的羟基(—OH)出现较大变化,说明—OH 是与KH 570 相互作用的主要基团,C O 键的伸缩振动新峰及Si 峰的出现,说明硅烷已成功接枝在HA晶体表面。n HA晶体与有机硅烷之间的界面结合相互作用主要包括氢键和化学键,但也存在羰基与钙离子之间产生静电荷吸引的可能。用此改性的n HA与高分子或牙科树脂复合可大大改善n HA与复合材料的力学性能,并发挥n HA 的生物功能效应。

In this paper, nanograde rod-like hydroxyapatite (n-HA) crystals were prepared by simple hydrothermal treatment. Since surface properties of hydroxyapatite play an important role in its performance, silane coupling agent/n-HA interface has been the focus of the research. In this study, an effective surface modification method was developed to treat n-HA slurry by using γ-(trimethoxysilyl) propyl methacrylate as a coupling agent. FT-infrared spectroscopy (FT-IR), Raman spectroscopy and X-ray photoelectron spectrum (XPS) were used to characterize the surface-modified n-HA. The experiment results showed that hydroxyl group decreased greatly after n-HA treated by silane, implying the occurrence of possible chemical reaction. Moreover, several surface modification mechanism was described, including chemical bond, hydrogen bond as well as the charge effect, which are the main types of the interaction between n-HA and silane. The analyses of n-HA/silane interface provide a promising perspective for further n-HA/polymer or n-HA/dental resin composites preparation.