Liu Jingjing, Liu Dian, Yokoyama Yuuichi, Yusa Shin-Ichi, Nakashima Kenichi
Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan.
Langmuir. 2009 Jan 20;25(2):739-43. doi: 10.1021/la802690m.
Polymeric micelles from a new triblock copolymer, polystyrene-block-poly[(3-(methacryloylamino)propyl)trimethylammonium chloride]-block-poly(ethylene oxide) (PS-b-PMAPTAC-b-PEO), were prepared in aqueous solutions and characterized by various techniques including dynamic light scattering (DLS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fluorescence spectroscopy. The micelle consists of a PS core, PMAPTAC shell, and PEO corona. It was revealed by SEM and DLS measurements that the micelles have a spherical structure with a hydrodynamic diameter about 75 nm. The addition of tungstate to the micellar solution caused a morphological change in the micelles from extended to shrunken spheres, which can be attributed to the fact that electrostatic repulsion among the cationic PMAPTAC blocks is canceled by the negative charge of the bound tungstate ions. Effective incorporation of tungstate ions into the micelles were confirmed by TEM and zeta-potential measurements.
由一种新型三嵌段共聚物聚苯乙烯-嵌-聚[(3-(甲基丙烯酰氨基)丙基)三甲基氯化铵]-嵌-聚环氧乙烷（PS-b-PMAPTAC-b-PEO）制备的聚合物胶束在水溶液中合成，并通过多种技术进行表征，包括动态光散射（DLS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和荧光光谱法。该胶束由PS核、PMAPTAC壳和PEO冠组成。SEM和DLS测量结果表明，胶束具有球形结构，流体力学直径约为75 nm。向胶束溶液中添加钨酸盐会导致胶束形态从伸展的球体变为收缩的球体，这可归因于结合的钨酸根离子的负电荷抵消了阳离子PMAPTAC嵌段之间的静电排斥。通过TEM和zeta电位测量证实了钨酸根离子有效掺入胶束中。
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