羟基硅油改性CaO-SiO_2-TiO_2有机-无机杂化材料的制备与显微结构

Preparation and microstructure of hydroxyl-terminated polydimethylsiloxane-modified CaO-SiO_2-TiO_2 organic-inorganic hybrids

采用溶胶-凝胶法制得了均匀、无裂纹的羟基硅油改性CaO-SiO2-TiO2有机-无机杂化材料。X射线衍射谱图和傅立叶红外吸收光谱的研究表明,制得的材料是非晶态的,由结合了聚二甲基硅氧烷链段的二氧化硅和二氧化钛网络组成,其中钙离子以离子键形式与网络相结合。通过对凝胶粉末的差热分析和热失重分析,确定了材料的热处理制度。通过扫描电子显微镜对材料表面的显微结构进行了观测和表征。溶胶-凝胶法制得的有机-无机杂化材料通常显示低弹性模量、高延展性及高机械强度。因此,羟基硅油改性CaO-SiO2-TiO2杂化材料有望成为一种新型的骨修复材料。

Homogeneous and crack-free monolithics of hydroxyl-terminated polydimethylsiloxane （OH-terminated PDMS）-modified CaO-SiO2-TiO2 organic-inorganic hybrids were successfully synthesized by sol-gel process. The study of X-ray diffraction （XRD） pattern and Fourier transform infra-red （FT-IR） absorption spectroscopy indicated that the obtained hybrids were amorphous and composed of a silica and titania network incorporated with PDMS, in which the calcium ion ionically bonded to the network. The heat treatment of the hybrids was determined by differential thermal analysis （DTA） and thermo-gravimetric analysis （TGA） of gel powder. The surface microstructures of the hybrids were observed and characterized by scanning electron microscope （SEM）. Organic-inorganic hybrids synthesized by sol-gel process usually exhibited low elastic modulus, high ductility and high mechanical strength. The present hybrids were, therefore, expected to be useful as a new kind of bone-repairing materials.