Template-Directed Synthesis of Hybrid Titania Nanowires within Core-Shell Bishydrophilic Cylindrical Polymer Brushes

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Yuan, Jiayin ; Lu, Yan ; Schacher, Felix H. ; Lunkenbein, Thomas ; Weiß, Stephan ; Schmalz, Holger ; Müller, Axel H. E.:
Template-Directed Synthesis of Hybrid Titania Nanowires within Core-Shell Bishydrophilic Cylindrical Polymer Brushes.
In: Chemistry of Materials. Bd. 21 (2009) Heft 18 . - S. 4146-4154.
ISSN 1520-5002
DOI: https://doi.org/10.1021/cm900032m

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Abstract

Well-defined core-shell bishydrophilic cylindrical polymer brushes (CPBs) with a poly(2-hydroxyethyl methacrylate) (PHEMA) core and a poly(oligo(ethylene glycol) methacrylate) (POEGMA) shell were synthesized via the combination of anionic polymerization and atom transfer radical polymerization. They were used as a unimolecular cylindrical template for the controlled fabrication of linear assemblies of titania nanoparticles. The titania precursors were found localized mainly in the brush core via a transalcoholysis reaction and partially in the shell via a weak complexation force. After hydrolysis, the obtained titania-CPB hybrid nanowires are amorphous and soluble in organic solvents as well as water. A phase transition from amorphous titania to anatase titania was found by refluxing the hybrid nanowire solution for 5 days in a mixture of water/dioxane (vol. ratio = 1/3). They could also serve as in situ template for the pyrolytic formation of inorgamc crystalline titania nanowires at 550 degrees C.