物理化学学报 >> 2010, Vol. 26 >> Issue (03): 626-630.doi: 10.3866/PKU.WHXB20100327

胶体及界面化学 上一篇    下一篇

聚酰胺-胺基两亲树枝状大分子与十二烷基硫酸钠混合体系的分子聚集行为

杨惠, 胡敏, 陈慧博, 杨世伟, 王金本   

  1. 哈尔滨工程大学材料科学与化学工程学院, 哈尔滨 150001; 中国科学院化学研究所, 胶体、界面与化学热力学院重点实验室, 北京 100190
  • 收稿日期:2009-09-25 修回日期:2010-01-04 发布日期:2010-03-03
  • 通讯作者: 王金本 E-mail:jbwang@iccas.ac.cn

Molecular Aggregation Behavior in the Mixture of Amphiphilic Poly(amidoamine)-Based Dendrimer and Sodium Dodecyl Sulfate

YANG Hui, HU Min, CHEN Hui-Bo, YANG Shi-Wei, WANG Jin-Ben   

  1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China; Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
  • Received:2009-09-25 Revised:2010-01-04 Published:2010-03-03
  • Contact: WANG Jin-Ben E-mail:jbwang@iccas.ac.cn

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0.1 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.

关键词: 聚集行为, 树枝状大分子, 浊度性质, 相互作用, 十二烷基硫酸钠

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.

Key words: Aggregation behavior, Dendrimer, Turbidity, Interaction, Sodiumdodecyl sulfate

MSC2000: 

  • O648