溶胶-凝胶法制备HEC/SiO_2杂化材料的工艺研究

Study on preparation of HEC/SiO2 organic/inorganic hybrid by Sol-Gel process

以羟乙基纤维素(HEC)、正硅酸乙酯(TEOS)为原料,采用溶胶-凝胶技术合成了HEC/SiO2有机-无机杂化材料。通过探讨水硅比、HEC含量、溶剂量、干燥控制化学添加剂用量、温度等工艺因素对凝胶化过程,特别是材料干燥体积收缩的影响,得出在本实验条件下合成HEC/SiO2有机-无机杂化材料的优化工艺条件。利用红外吸收光谱、紫外-可见光透射光谱以及扫描电子显微镜等测试手段对合成的HEC/SiO2有机-无机杂化材料进行表征。结果表明,HEC作为有机分散相已经均匀地分散到SiO2基相中,制备的HEC/SiO2有机-无机杂化材料透明,无分相,并可能形成了新的化学键。

Hydroxyethyl cellulose and tetraethyl orthosilicate are chosen as the stuffs for the reaction, and HEC/SiO2 organic/inorganic hybrid are prepared by Sol-Gel process. By discussing the factors that can effect on the reaction, especially the volume shrinkage of the material, such as the rate of water with silicon dioxide, the thickness of HEC, the dosage of ethanol and formamide and the reaction temperature and so on, the authors obtain the optimal condition that HEC/SiO~ hybrid can be synthesized and characterize the HEC/SiO2 hybrid by infrared absorption spectrum （IR）, ultraviolet- visible spectroscopy（UV） and the scanning electron microscope（SEM）. The result indicates that the HEC, a disperse phase in the hybrid materials, is dispersed in the silicon dioxide substrates on molecular level evenly. Also, the authors find that there may be some new chemical bonds appearing in the HEC/SiO2 hybrid and there are chemically stable under the irradiation of ultraviolet.