Hierarchical Self-Assembly of Polyhedral Oligomeric Silsesquioxane End-Capped Stimuli-Responsive Polymer: From Single Micelle to Complex Micelle
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- 作者：Li Ma ; Haiping Geng ; Jiangxuan Song ; Jinze Li ; Guangxin Chen ; Qifang Li
- 刊名：Journal of Physical Chemistry B
- 出版年：2011
- 出版时间：September 15, 2011
- 年：2011
- 卷：115
- 期：36
- 页码：10586-10591
- 全文大小：922K
- 年卷期：v.115,no.36(September 15, 2011)
- ISSN：1520-5207
文摘
Responsive polymeric micelles have been widely studied because of their potential use in nanocontainers and nanocarriers. In this study, polyhedral oligomeric silsesquioxane (POSS) end-capped poly[2-(dimethylamino)ethyl methacrylate] (POSS鈥揚DMAEMA), a stimuli-responsive organic鈥搃norganic hybrid polymer, was synthesized via atom transfer radical polymerization (ATRP) using POSS鈥揃r as a macroinitiator. The self-assembly behaviors of POSS鈥揚DMAEMA in aqueous solution were studied by fluorescence probe, transmission electron microscopy (TEM), dynamic light scattering (DLS), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD). The results revealed two self-assembly processes of POSS鈥揚DMAEMA. First they self-assembled into a single micelle with the POSS molecules forming a crystal core and the PDMAEMA chains stretching as a corona. Then the single micelles, as building blocks, were able to reversibly form a hierarchical micelle-on-micelle structure (complex micelle) under external stimuli.