Preparation of hollow silica nanospheres by surface-initiated atom transfer radical polymerization on polymer latex templates

Titelangaben

Chen, Yiwang ; Kang, En-Tang ; Neoh, Koon-Gee ; Greiner, Andreas:
Preparation of hollow silica nanospheres by surface-initiated atom transfer radical polymerization on polymer latex templates.
In: Advanced Functional Materials. Bd. 15 (2005) Heft 1 . - S. 113-117.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.200400179

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Abstract

Poly(vinylbenzyl chloride), (PVBC) latex particles of about 100 nm in size are prepared by emulsion polymerization. Silyl functional groups are introduced onto the PVBC-nanoparticle templates via surface-initiated atom transfer radical polymerization of 3-(trimethoxysilyl)propyl methacrylate. The silyl groups are then converted into a silica shell, approximately 20 nm thick, via a reaction with tetraethoxysilane in ethanolic ammonia. Hollow silica nanospheres are finally generated by thermal decomposition of the PVBC template cores. Field-emission scanning electron microscopy and field-emission transmission electron microscopy are used to characterize the intermediate products and the hollow nanospheres. Fourier-transform infrared spectroscopy results indicate that the polymer cores are completely decomposed.