Formation and microstructure transition of F127/TX-100 complex.
Formation and microstructure transition of F127/TX-100 complex.
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DOI：
10.1021/jp802717p
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
Lingling Ge;R. Guo;Xiaohong Zhang
中科院分区：
文献类型：
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作者：
Lingling Ge;R. Guo;Xiaohong Zhang
通过1H NMR光谱、动态光散射(DLS)和等温滴定量热法(ITC)研究了三嵌段共聚物F127和非离子表面活性剂TX-100组成的配合物的形成和结构转变。确定了三个 TX-100 浓度区域，其中 TX-100/20 mg/mL F127 复合物经历不同的温度诱导结构转变。在低浓度区域（157.57 mM），游离的 TX-100 胶束与较大的 F127/TX-100 复合物簇共存。此外，还在恒温下研究了TX-100诱导的F127/TX-100复合物形成和结构转变。结果表明，在5-10℃范围内，F127单聚体与普通水溶性聚合物一样主要吸附在TX-100胶束表面；在15-25℃的温度范围内，TX-100胶束促进F127胶束形成。在30-40℃内，TX-100插入F127胶束中，导致F127聚集体在较高TX-100浓度下分解，获得的单聚体穿过TX-100胶束，形成以TX-100胶束为骨架的复合物。
Formation and structure transition of the complex composed of triblock copolymer F127 and nonionic surfactant TX-100 have been investigated by 1H NMR spectroscopy, dynamic light scattering (DLS), and isothermal titration calorimetry (ITC). Three TX-100 concentration regions are identified, within which TX-100/20 mg/mL F127 complex undergoes different temperature-induced structure transitions. In low concentration region ( 157.57 mM), and free TX-100 micelles coexist with larger clusters of F127/TX-100 complexes. In addition, TX-100-induced F127/TX-100 complex formation and structure transition are also investigated at constant temperatures. The results show that within 5-10 degrees C, F127 unimers mainly adsorb on the surface of TX-100 micelles just like normal water soluble polymers; in the temperature region of 15-25 degrees C, TX-100 micelles prompts F127 micelle formation. Within 30-40 degrees C, TX-100 inserts into F127 micelles leading to the breakdown of F127 aggregates at higher TX-100 concentrations, and the obtained unimers thread through TX-100 micelles forming complex with TX-100 micelle as skeleton.