Formation of Well-Defined Vesicles by Styrene Addition to a Nonionic Surfactant and Their Polymerization Leading to Viscous Hybrid Systems.
Formation of Well-Defined Vesicles by Styrene Addition to a Nonionic Surfactant and Their Polymerization Leading to Viscous Hybrid Systems.
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通过将苯乙烯添加到非离子表面活性剂中形成明确的囊泡及其聚合形成粘性杂化体系
DOI：
10.1021/acs.langmuir.8b01377
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Gradzielski
中科院分区：
文献类型：
--
作者：
H. Yalcinkaya;A. Feoktystov;M. Gradzielski
水溶液中的自组装结构可以在添加疏水性单体后通过聚合来固定，并且因此可以用作允许基本上改变这些系统的性质的模板。在这项工作中，我们开始从一个自组装胶束系统组成的非离子表面活性剂氧化十四烷基二甲基胺和普朗尼克L35，其中苯乙烯作为可聚合单体。有趣的是，据观察，苯乙烯诱导从胶束到明确定义的囊泡以类似的方式作为一个典型的助表面活性剂的过渡。通过浊度、动态和静态光散射、小角中子散射和流变学测量，研究了苯乙烯加成后聚集体的结构转变以及引发聚合反应后形成的结构。特别是散射的结果证实了有趣的效果苯乙烯的介观结构，并显示了从棒状胶束低苯乙烯浓度的囊泡在中间苯乙烯量的结构演变，然后最终形成的微乳液液滴高苯乙烯含量。它们的囊泡聚合再次导致蠕虫状聚合聚集体的形状变化，其存在则导致相当粘稠的系统。相比之下，具有较高苯乙烯含量的微乳液则被模板化并在聚合后保持其尺寸，从而导致纳米晶格。
Self-assembled structures in aqueous solutions can be fixed by polymerization after adding hydrophobic monomers and can thereby be used as templates which allow to substantially alter the properties of these systems. In this work, we started from a self-assembled micellar system consisting of the nonionic surfactants tetradecyldimethylamine oxid and Pluronic L35 to which styrene was added as a polymerizable monomer. Interestingly, it was observed that styrene induces a transition from micelles to well-defined vesicles in a similar manner as a typical cosurfactant. The structural transition of the aggregates upon styrene addition as well as the structures formed after initiating a polymerization reaction were investigated by means of turbidity, dynamic and static light scattering, small-angle neutron scattering, and rheology measurements. Especially the scattering results confirmed the interesting effect of styrene on the mesoscopic structure and showed a structural evolution from rod-like micelles for low styrene concentrations to vesicles at intermediate styrene amounts, and then finally the formation of microemulsion droplets for high styrene content. Their polymerization of the vesicles again leads to a shape change to wormlike, polymerized aggregates, whose presence then results in rather viscous systems. In contrast, the microemulsions with higher styrene content then are templated and retain their size after polymerization, thereby leading to nanolattices.
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