【摘要】 以浊度分析、动态激光光散射(DLS)、透射电子显微镜(TEM)以及原子力显微镜(AFM)等方法研究了以1.0代(G1)聚酰胺-胺(PAMAM)为核心、以聚环氧丙烷-聚环氧乙烷(PPO-PEO)为辐射臂的树枝状大分子与十二烷基硫酸钠(SDS)之间的相互作用.值得注意的是,当树枝状大分子溶液的浓度为1%(质量分数),SDS的浓度远低于临界胶束浓度(cmc)时,体系的浊度值开始明显升高,DLS、TEM以及AFM的研究结果显示出此时聚集体的尺寸逐渐增加,意味着SDS与树枝状大分子有着很强的分子间相互作用,形成了树枝状大分子与SDS构成的复合物.当SDS浓度增高至0.1mmol·L-1(约为cmc的1%)左右时,体系的浊度值随着SDS浓度的增加变化不大,DLS、TEM、AFM的实验结果显示,聚集体尺寸趋于稳定状态.当SDS的浓度继续升高至0.25和0.5mol·L-1时,体系中形成了SDS分子间的自聚集或者存在多个SDS分子与单个树枝状大分子的分子间聚集.更多还原

【Abstract】 In this paper,the interaction between a dendrimer,composed of G1 (generation 1.0) poly(amidoamine) (PAMAM) and branched with poly(propylene oxide) (PPO)-poly(ethylene oxide) (PEO),and sodium dodecyl sulfate (SDS) was investigated by turbidity titration,dynamic light scattering (DLS),transmission electron microscopy (TEM),and atomic force microscopy (AFM).Interestingly,at low concentrations of added SDS far from the critical micelle concentration (cmc),the system with the dendrimer at 1%(mass fraction) exhibited higher turbidity,indicating that the aggregates grew larger and this was confirmed by DLS,TEM,and AFM.It is mainly due to the strong interaction between the dendrimer and the SDS molecules,as well as the formation of a dendrimer-SDS complex.With a SDS concentration of more than 0.1 mmol·L-1 (about 1% of the cmc),the variation of turbidity value was not obvious mainly because the aggregate size tended to be constant observed from DLS,TEM,and AFM.As the concentration increased further (0.25 and 0.5 mol·L-1),self-aggregation of the SDS molecules or aggregation of the monomolecular dendrimer that interacted with the multimolecular SDS occurred in the system.更多还原