中文摘要：

合成了含有确定长度的聚异丁烯链段与4种不同的乙烯胺链段（乙二胺、二乙烯三胺、三乙烯四胺和四乙烯五胺）组合的聚异丁烯丁二酰亚胺系列衍生物,并将它们用作TiO2纳米粒子在非极性溶剂中的分散剂.详细考察了亲水/亲油基团大小对分散性能的影响规律：当聚异丁烯链段的分子量为2000时,随着乙烯胺段链长的增加,TiO2粒子的粒径和Zeta电位分别呈现递减和递增的趋势,而分散剂的吸附量反而减少,证明了随着乙烯胺段链长的增加,分散剂和粒子表面的相互作用越强,分散效果越好;而当乙烯胺段都为四乙烯五胺时,聚异丁烯链段的分子量为2000时分散性能要比分别为1000和3000时好.由此,获得分散剂最佳的HLB（hydrophile-lipophile balance）值应在2.5左右.采用该分散剂处理的TiO2粒子,可实现良好的电泳显示.

英文摘要：

A series of polyisobutenylsuccinimide derivatives,in which polyisobutenylene block with a definite chain length was linked with four different ethylenediamine end groups（diaminoethane,diethylenetriamine,triethylenetetraamine,and tetraethylenepentaamine）,were synthesized and used to dis-perse TiO2 nanoparticles in nonpolar solvent.The influences of the sizes of hydrophilic/hydrophobic groups on the dispersibility of TiO2 nanoparticles were investigated,and it was found that： when the molecular weight of polyisobutenylene block was fixed at 2000,Zeta potentials of TiO2 particles increased while their particle sizes decreased with the increasing of the length of ethylenediamine chain in the dispersants,implying that the interactions between the dispersant and TiO2 nanoparticles became stronger.It was also disclosed that when the polyamine end group came to be tetraethylenepentaamine,polyisobutenylsuccinim-ide with a 2000 molecualr weight of polyisobutenylene block showed the best dispersing ability while compared to those with 1000 and 3000 molecular weights of polyisobutenylene segments.Thus,the most appropriate HLB（hydrophile-lipophile balance） value of the dispersant was estimated as around 2.5.The obtained TiO2 nanoparticles treated with such a dispersant demonstrated good electrophoretic displays.