CAJ | 학술논문

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0.1 mmol·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0.5 mol·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.
이탁도분석、동태격광광산사(DLs)、투사전자현미경(TEM)이급원자력현미경(AFM)등방법연구료이1.0대(G1)취선알-알(PAMAM)위핵심、이취배양병완.취배양을완(PPO-PEO)위복사비적수지상대분자여십이완기류산납(SDs)지간적상호작용.치득주의적시,당수지상대분자용액적농도위1%(질량분수),SDS적농도원저우림계효속농도(cmc)시,체계적탁도치개시명현승고,DLS、TEM이급AFM적연구결과현시출차시취집체적척촌축점증가,의미착SDS여수지상대분자유착흔강적분자간상호작용,형성료수지상대분자여SDS구성적복합물.당SDS농도증고지0.1 mmol·L~(-1)(약위cmc적1%)좌우시,체계적탁도치수착SDS농도적증가변화불대,DLS、TEM、AFM적실험결과현시,취집체척촌추우은정상태.당SDS적농도계속승고지0.25화0.5 mol·L~(-1)시,체계중형성료SDS분자간적자취집혹자존재다개SDS분자여단개수지상대분자적분자간취집.
In this paper, the interaction between a dendrimer, composed of Gl (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.