A Giant Surfactant of Polystyrene−(Carboxylic Acid-Functionalized Polyhedral Oligomeric Silsesquioxane) Amphiphile with Highly Stretched Polystyrene Tails in Micellar Assemblies
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- 作者：Xinfei Yu ; Sheng Zhong ; Xiaopeng Li ; Yingfeng Tu ; Shuguang Yang ; Ryan M. Van Horn ; Chaoying Ni ; Darrin J. Pochan ; Roderic P. Quirk ; Chrys Wesdemiotis ; Wen-Bin Zhang ; Stephen Z. D. Cheng
- 刊名：Journal of the American Chemical Society
- 出版年：2010
- 出版时间：December 1, 2010
- 年：2010
- 卷：132
- 期：47
- 页码：16741-16744
- 全文大小：204K
- 年卷期：v.132,no.47(December 1, 2010)
- ISSN：1520-5126
文摘
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.