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Preparation of organic/inorganic coated functional nanoparticles and its highly dense and uniform dispersion into resin

有机/无机包覆功能纳米颗粒的制备及其在树脂中的高致密均匀分散

基本信息

批准号：
16360379
负责人：
KAMIYA Hidehiro
金额：
$ 9.73万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Various kinds of functional nanoparticles were prepared and treated their surfaces to obtain the uniform dispersion in organic solvent and resin. Materials used were titania, ZnO, ZnS for the high refractive index optical material, BaTiO_3 for the polymer condenser and silica coated iron for the application of magnetic material. In order to disperse nanoparticle in organic solvent and resign, two kinds of approaches, synthesis and dispersion simultaneous process of nanoparticles, and multi stage surface modification of highly crystallized nanoparticles were investigated. In the former method, highly dispersed iron and zinc oxide, BaTiO_3 nanoparticles up to primary particle were able to be prepared from the complex with positive ion over the bivalent, Fe, Zn, Ba and fatty acid or microbial derived surfactant in non polar solvent, such as toluene. The preparation process of nanometer scaled uniform silica layer coated metal nanoparticles without aggregation was also developed by silica layer coating on oxide particles and hydrogen reduction. On the contrary, by multi stage surface modification, such as silane coupling agent and graft polymerization of MMA and polystyrene, on prepared TiO_2 nanoparticles with high crystalline, TiO_2 nanoparticles were dispersed in organic solvent such as MMA and ethanol solution. Highly concentrated TiO_2 nanoparticles dispersed PMMA composite up to 43 vol% was prepared from multi stage surface modified nanoparticles by solvent evaporation and hot pressing or isotropic high-pressure pressing process.

制备了各种功能性纳米粒子，并对其进行了表面处理，使其在有机溶剂和树脂中均匀分散。所用材料为高折射率光学材料TiO_2、ZnO、ZnS，聚合物电容器材料BaTiO_3，磁性材料材料为涂硅铁。为了实现纳米粒子在有机溶剂中的分散和树脂化，本文研究了纳米粒子的合成与分散同步化以及对高度结晶的纳米粒子进行多阶段表面改性两种方法。前者是在非极性溶剂（如甲苯）中，由二价铁、锌、钡与脂肪酸或微生物表面活性剂形成的阳离子络合物，制备出高分散的铁、锌氧化物、钛酸钡纳米粒子，直至初级粒子。通过在氧化物颗粒表面包覆二氧化硅层，并利用氢气还原法制备了无团聚的纳米级均匀二氧化硅包覆金属纳米颗粒。通过硅烷偶联剂、MMA与聚苯乙烯的接枝聚合等多阶段表面改性，使纳米TiO_2分散在有机溶剂中，从而提高了纳米TiO_2的结晶度。采用溶剂蒸发-热压或各向同性高压成型工艺，对纳米TiO_2颗粒进行多阶段表面改性，制备了含量高达43vol%的纳米TiO_2颗粒分散PMMA复合材料。