A giant surfactant of polystyrene-(carboxylic Acid-functionalized polyhedral oligomeric silsesquioxane) amphiphile with highly stretched polystyrene tails in micellar assemblies.
A giant surfactant of polystyrene-(carboxylic Acid-functionalized polyhedral oligomeric silsesquioxane) amphiphile with highly stretched polystyrene tails in micellar assemblies.
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DOI：
10.1021/ja1078305
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发表时间：
2010-11
影响因子：
15
通讯作者：
Xinfei Yu;Sheng Zhong;Xiaopeng Li;Y. Tu;Shuguang Yang;Ryan M. Van Horn;C. Ni;D. Pochan;R. Quirk
中科院分区：
文献类型：
--
作者：
Xinfei Yu;Sheng Zhong;Xiaopeng Li;Y. Tu;Shuguang Yang;Ryan M. Van Horn;C. Ni;D. Pochan;R. Quirk
聚苯乙烯-（羧酸官能化多面体低聚倍半硅氧烷）缀合物（PS-APOSS）是一种新型巨型表面活性剂，具有明确的亲水性头部和疏水性聚合物尾部，通过活性阴离子聚合、氢化硅烷化和硫醇-烯“点击”化学来设计和合成。 PS-APOSS在选择性溶剂中形成胶束，通过增加羧酸的电离程度，可以将胶束形态从囊泡调整为蠕虫状圆柱体，并进一步调整为球体。 APOSS-APOSS 相互作用的影响被证明对于胶束的形态转变至关重要。与传统两亲性嵌段共聚物相比，这些胶束核中的 PS 尾部被发现高度拉伸，这可以用自由能最小化来解释。这类新型巨型表面活性剂扩展了大分子两亲物的范围，并为研究其自组装行为的基本物理原理提供了平台。
A novel giant surfactant possessing a well-defined hydrophilic head and a hydrophobic polymeric tail, polystyrene-(carboxylic acid-functionalized polyhedral oligomeric silsesquioxane) conjugate (PS-APOSS), has been designed and synthesized via living anionic polymerization, hydrosilylation, and thiol-ene "click" chemistry. PS-APOSS forms micelles in selective solvents, and the micellar morphology can be tuned from vesicles to wormlike cylinders and further to spheres by increasing the degree of ionization of the carboxylic acid. The effect of APOSS-APOSS interactions was proven to be essential in the morphological transformation of the micelles. The PS tails in these micellar cores were found to be highly stretched in comparison with those in traditional amphiphilic block copolymers, and this can be explained in terms of minimization of free energy. This novel class of giant surfactants expands the scope of macromolecular amphiphiles and provides a platform for the study of the basic physical principles of their self-assembly behavior.