Optical Properties of Immobilized Colloidal Crystals of Polymer-modified Silica Containing Chromophore group and Their Application

1.含发色基团的聚合物在硅胶上的接枝及有机溶剂中的胶态结晶以乙烯基单体与含二茂铁或二烯-Fe（0）三碳基的丙烯酸酯或甲基丙烯酸酯进行自由基共聚，合成了含发色基团的共聚物硅烷。通过共聚硅烷与二氧化硅表面羟基的反应，将共聚物接枝到直径为130 nm的硅胶上。结果表明，在N，N-二甲基甲酰胺、乙醇、丙酮等极性溶剂中，接枝二氧化硅均发生胶态结晶。用含有Ru（II）-trisbipylidyl配合物部分的共聚物改性的胶体二氧化硅在有机溶剂中也形成胶体晶体，其在500 ~ 600 nm区域具有吸收带。这种方法由于可以提高硅溶胶的本征折射率或介电常数而受到广泛关注. IM中单晶尺寸和球间距的估算 ...更多信息 固定化胶体晶体研究了聚合物改性二氧化硅在有机溶剂中形成的胶体晶体在固定化过程中的单晶尺寸和球间距的变化，并阐明了其变化与颗粒体积分数的关系.采用原子转移自由基聚合法合成了高分子量聚合物接枝二氧化硅，并在有机溶剂中通过接枝聚合物链的空间位阻作用得到了胶体晶体。但是，采用分步聚合法是不可能实现的.含过渡金属络合物部分的聚合物接枝二氧化硅胶体晶体的光学性质在有机溶剂中形成的过渡金属络合物系链的聚合物改性二氧化硅胶体晶体根据共聚物的组成和溶剂给出特定的颜色。着色归因于在有机溶剂中络合物部分在400 - 500 nm范围内的吸收带与通过胶体晶体的700 - 800 nm可见光透射之间的平衡。少

1. Grafting of polymer containing chromophore group onto colloidal silica and colloidal crystallization in organic solventCopolymer silanes with chromophore were synthesized by radical copolymerization of vinyl monomer and acrylate or methacrylate having ferroceny or diene-Fe (0) tricarboby group. Grafting of copolymer onto colloidal silica of 130 nm in diameter was carried out by the reaction of the copolymer silane with hydroxyl group on silica. It was observed that colloidal crystallization of copolymer-grafted silica occurred in polar solvent, such as N,N-dimethylformamide, ethanol or acetone. Colloidal silica modified with copolymer containing Ru (II) -trisbipylidyl complex moiety, having absorption bands in the region at 500〜600 nm, also formed colloidal crystals in organic solvent. This approach has been received much attention for increasing intrinsic refractive index or dielectric constant of colloidal silica.2. Estimation of single crystal size and inter-sphere distance in im … More mobilized colloidal crystalsChanges of single crystal size and inter-sphere distance during immobilization of colloidal crystals, formed by polymer-modified silica in organic solvent, were investigated and relation between the changes and volume fraction of the particles was clarified.3. Increasing colloidal crystal size in organic solventHigh molecular weight polymer-grafted silica, synthesized by an atom transfer radical polymerization, gave colloidal crystals stemming from steric interaction of grafting polymer chains in organic solvent. However, It was impossible to immobilize by a stepwise polymerization.4. Optical properties of colloidal crystals of polymer-grafted silica containing transition-metal complex moietyColloidal crystals of transition metal complex-tethered polymer-modified silica formed in organic solvent gave out specific coloration depending on composition of copolymer and on solvent. The coloration was ascribed to balances between absorbance bands of the complex moiety in the range from 400〜500 nm and transmission of visible light from 700〜800 nm through colloidal crystals in organic solvent. Less