CONTROL OF SURFACE POLARITY AND POTENTIAL OF MONODISPERESE INORGANIC COLLOIDAL PARTICLES BY POL YMER MODIFICATION

1.马来酸酐-硅烷偶联剂的表面改性马来酸酐-硅烷偶联剂在1，2-二甲氧基乙烷中反应，得到粒径在10 nm ~ 1 μ m的单分散硅溶胶。通过第二聚合物的结合控制表面极性和电势第二聚合物与上述复合颗粒的结合能够控制表面极性。聚合物电解质作为第二聚合物的引入使得复合粒子的zeta电位在-110 mV ~+65 mV之间的控制成为可能.聚合物复合物的结合和复合物的性质将温度响应性聚合物聚（N-异丙基丙烯酰胺）接枝2，2 ′-联吡啶基团结合到单分散胶体二氧化硅（120 nm）上，得到Fe（II），Co（II），Ni（II），Zn（II）和Ru（III）离子的定量配位。发现聚马来酸酐-苯乙烯改性的二氧化硅粒子（120- 500 nm）在极性溶剂（如乙腈或丙酮）中，在体积分数为0.010-0.02左右形成胶体晶体。

1. Surface modification with polymer-silane coupling agent containing maleic anhydride moietyThe reaction of monodisperse colloidal silica with copolymer-silane coupling agent prepared from maleic anhydride in 1,2-dimethoxyethane afforded monodisperse composite particles in the size range from 10nm to 1mum.2. Control of surface polarity and potential by bindings of secondary polymerThe bindings of the secondary polymer to the above composite particles enabled to control the surface polarity. The introduction of the polymer electrolyte as a secondary polymer made controlling of zeta-potential of the composite particles from-110 mV to +65 mV possible.3. Bindings of polymer complexes and properties of the compositesTne composite particles bound the temperature-responded polymer, poly (N-isopropylacrylamide), grafted 2,2'-bipyridyl groups to monodisperse colloidal silica (l20 nm) gave the quauntitative coordination of Fe (II), Co (II), Ni(II), Zn(II), and Ru(III) ion. These particles aggregated due to the ligand exchange among particles above the transition temperature of the polymer.Formation of colloid crystalIt is found out that poly (maleic anhydride-stirene)-modified silica particles (120-500nm) formed the colloid crystal around the volume fraction of 0.010-0.02 in a polar and good solvent for the polymer, such as acetonitrile or acetone.