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Surface-initiated living radical polymerization from silica particles functionalized with poly(ethylene glycol)-carrying initiator

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Abstract

A novel yet versatile approach is described for surface-initiated living radical polymerization (SI-LRP) from silica particles (SiPs). Monodisperse SiPs were surface-modified with a newly designed surface-fixable initiator (BPEGE) having three components: a triethoxysilane moiety, a poly(ethylene glycol) (PEG) unit, and an initiation site for atom transfer radical polymerization (ATRP) in the form of a 2-bromoisobutyryl group. The surface-initiated ATRP of methyl methacrylate (MMA) mediated by a copper complex was carried out with the BPEGE-fixed SiPs. The polymerization proceeded in a living manner, producing SiPs coated with well-defined poly(MMA) of a target molecular weight with a graft density as high as 0.5 chains/nm2. Thanks to the amphiphilic property of PEG, the system was successfully applied for SI-ATRP of PEG methacrylate and sodium p-styrenesulfonate in aqueous media in which the BPEGE-fixed SiPs were highly dispersed without causing any aggregations. The formation of colloidal crystals with the polymer brush-afforded SiPs demonstrated the high uniformity and perfect dispersibility of the hybrid particles.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research (Grant-in-Aid 17685010 and 23685049) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan, and by the Industrial Technology Research Grant Program in 2004 and 2009 from the New Energy and Industrial Technology Development Organization (NEDO) of Japan. We thank Tosoh Organic Chemical Co., Ltd., for their kind donation of NaSS.

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Authors and Affiliations

  1. Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan

    Kohji Ohno, Hiroshi Tabata & Yoshinobu Tsujii

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  1. Kohji Ohno
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  2. Hiroshi Tabata
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  3. Yoshinobu Tsujii
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Correspondence to Kohji Ohno.

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Ohno, K., Tabata, H. & Tsujii, Y. Surface-initiated living radical polymerization from silica particles functionalized with poly(ethylene glycol)-carrying initiator. Colloid Polym Sci 291, 127–135 (2013). https://doi.org/10.1007/s00396-012-2734-7

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  • DOI: https://doi.org/10.1007/s00396-012-2734-7

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