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

1. 用含马来酸酐的聚合物-硅烷偶联剂进行表面改性用马来酸酐制备的共聚物-硅烷偶联剂在1,2-二甲氧基乙烷中与单分散二氧化硅胶体反应，得到粒径为10nm ~ 1nm的单分散复合颗粒。二级聚合物与上述复合粒子的结合可以控制表面极性。聚合物电解质作为二次聚合物的引入使得复合粒子的ζ电位从-110 mV控制到+65 mV成为可能。聚合物配合物的结合和复合材料的性能estne复合颗粒结合温度响应聚合物，聚（n -异丙基丙烯酰胺），接枝2,2'-联吡啶基到单分散胶体二氧化硅（l20nm）上，给出了Fe (II), Co (II), Ni(II), Zn（II）和Ru（III）离子的定量配位。这些颗粒聚集是由于颗粒之间的配体交换高于聚合物的转变温度。胶体晶体的形成研究发现，聚马来酸酐-苯乙烯改性二氧化硅颗粒（120 ~ 500nm）在极性良好的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.