Abstract
Organic/inorganic hybrids were prepared by catalytic hydrolysis and subsequent polycondensation of tetra-n-butyl titanate (TnBT) in shell layers grafted on core particles. The core particles were synthesized by emulsifier-free emulsion polymerization of styrene, N-n-butyl-N-2-methacryloyloxyethyl-N,N-dimethylammonium bromide (C4DMAEMA), and 2-chloropropionyloxyethyl methacrylate using 2,2′-azobis(2-amidinopropane) dihydrochloride as an initiator. The core diameters were controlled in the range of 70–550 nm by adjusting a C4DMAEMA feed concentration. The core–shell particles were prepared by surface-initiated activator generated electron transfer–atom transfer radical polymerization of 2-(N,N-dimethylamino)ethyl methacrylate (DMAEMA). The sizes of core–shell particles were found to increase monotonically with an increase in a DMAEMA concentration. The hybrid particles were fabricated by adding TnBT into a water/ethanol dispersion of core–shell particles. The amounts of titania deposited increased in proportion to the grafted amounts of poly[2-(N,N-dimethylamino)ethyl methacrylate] on the core particles. The X-ray diffraction measurement revealed that the hollow titania particles obtained by heat treatment of hybrids have an anatase crystallographic phase.
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Acknowledgments
The authors would like to acknowledge Sekisui Chemical for TEM observation. We gratefully acknowledge Nippon Steel Chemical for providing some of the reagents.
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Taniguchi, T., Murakami, F., Kasuya, M. et al. Preparation of titania hollow particles with independently controlled void size and shell thickness by catalytic templating core–shell polymer particles. Colloid Polym Sci 291, 215–222 (2013). https://doi.org/10.1007/s00396-012-2658-2
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DOI: https://doi.org/10.1007/s00396-012-2658-2