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Adsorption and Aggregation Properties of Gemini-Type Amphiphilic Dendrimers.
Langmuir ( IF 3.7 ) Pub Date : 2020-01-06 , DOI: 10.1021/acs.langmuir.9b02506
Tomokazu Yoshimura 1 , Nara-Karyn Kawano 1 , Shiho Yada 1 , Hiroki Iwase 2
Affiliation  

Gemini-type amphiphilic dendrimers featuring two dodecyl chains and two poly(amidoamine) dendrons (2C12-2denGn, where n is the dendron (den) generation (G) number (1, 2, 3, 4, or 5)) were synthesized using ethylenediamine, alkyl bromide, and methyl acrylate. These gemini-type dendrimers were characterized by surface tension, pyrene fluorescence, static light scattering, and small-angle X-ray scattering. The results showed clear breakpoints in the surface tension versus concentration plots, which indicated adsorption at the air/water interface and micelle formation in solution despite the bulky dendron structure (e.g., generations 3 to 5), contrasting the behavior of conventional surfactants. The 2C12-2denGn dendrimers could be densely packed at the air/water interface owing to enhanced interaction between the dendrons and between the alkyl chains. Furthermore, these dendrimers formed spherical micelles at a concentration of 5.0 mmol dm-3 in solution (pH 9); the overall micelle size was not dependent on the generation number of the dendron, while as the generation number increased, the core radius of the micelle decreased, and the shell thickness of the micelle increased.

中文翻译:

双子型两亲树状聚合物的吸附和聚集性质。

使用以下方法合成了具有两个十二烷基链和两个聚(酰胺基胺)树突(2C12-2denGn,其中n是树突(den)代(G)数(1、2、3、4或5))的Gemini型两亲树状聚合物。乙二胺,烷基溴和丙烯酸甲酯。这些双子型树状聚合物的特征在于表面张力,pyr荧光,静态光散射和小角度X射线散射。结果表明,表面张力与浓度的关系曲线上有明显的断点,这表明尽管树枝状结构较大(例如第3至5代),但在空气/水界面处的吸附和溶液中的胶束形成却与常规表面活性剂的行为形成对比。由于树枝状分子之间和烷基链之间的相互作用增强,因此2C12-2denGn树状聚合物可以在空气/水界面处密集堆积。此外,这些树枝状大分子在溶液(pH 9)中以5.0 mmol dm-3的浓度形成球形胶束。整体胶束的大小不依赖于树枝状分子的生成数,而随着生成数的增加,胶束的核心半径减小,而胶束的壳厚度增加。
更新日期:2020-01-07
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