Organic鈥揑norganic Hybrid Nanoparticles via Photoinduced Micellation and Siloxane Core Cross-Linking of Stimuli-Responsive Copolymers

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• 作者：Christian Anger ; Frank Deubel ; Stephan Salzinger ; J眉rgen Stohrer ; Tobias Halbach ; Rainer Jordan ; Jonathan G. C. Veinot ; Bernhard Rieger
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：February 19, 2013
• 年：2013
• 卷：2
• 期：2
• 页码：121-124
• 全文大小：251K
• 年卷期：v.2,no.2(February 19, 2013)
• ISSN：2161-1653

文摘

Photoacid-induced siloxane cross-linking of stimuli-responsive copolymer micelles allows the synthesis of well-defined organic鈥搃norganic hybrid nanoparticles. Two conceptually different synthetic approaches are presented, both via photoinduced cross-linking of poly(4-hydroxystyrene-block-styrene) micelles and via one-pot photoacid-catalyzed micelle formation and siloxane cross-linking of poly(4-tert-butoxystyrene-block-styrene). The multistep synthetic route showed intermicellar cross-linking leading to agglomerates. In contrast to this, the formation of the nanoparticles via the one-pot synthesis yielded well-defined structures. The use of different siloxane cross-linking agents and their effects on the properties of the cross-linked micellar structures have been evaluated. Scanning electron microscopy and differential scanning calorimetry indicate rigid core cross-linked nanoparticles. Their size, molar mass, and swelling behavior were analyzed by dynamic and static light scattering. Cyclic siloxane cross-linking agents lead to residual C鈺怌 double bonds within the nanoparticle core that allow postsynthetic modification by, e.g., thiol鈥揺ne click reactions.