Epoxy-based hybrids using TiO2 nanoparticles prepared via a non-hydrolytic sol–gel route

Authors

  • Manabu Kobayashi,

    1. Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
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  • Hitomi Saito,

    1. Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
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  • Bruno Boury,

    1. Institut Charles Gerhardt Montpellier, Montpellier, France
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  • Kimihiro Matsukawa,

    1. Osaka Municipal Technical Research Institute, Osaka, Japan
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  • Yoshiyuki Sugahara

    Corresponding author
    1. Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
    2. Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Tokyo, Japan
    • Correspondence to: Yoshiyuki Sugahara, Department of Applied Chemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169–8555, Japan. E-mail: ys6546@waseda.jp

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Abstract

TiO2 nanoparticles with an average diameter of less than 10 nm were prepared via a non-hydrolytic sol–gel route in a TiCl4–diisopropyl ether–CH2Cl2 system. After modification with n-octylphosphonic acid (OPA) to increase their organophilic character, the TiO2 nanoparticles were used for preparation of TiO2/epoxy hybrid films. Characterization by FT-IR, solid-state 13C cross-polarization/magic angle spinning (CP/MAS) and 31P MAS NMR techniques showed the preservation of the n-octyl groups and the presence of Ti[BOND]O[BOND]P bonds on the surface of TiO2 nanoparticles. Hybrid films with various TiO2 contents were prepared via a wet process and casting using CH2Cl2 as a solvent. The resulting films were highly transparent. The refractive indices of TiO2/epoxy hybrid films at 633 nm increased monotonously from 1.51 for the pure polymer to 1.66 for the hybrid containing 62.4 mass% of TiO2 nanoparticles. Copyright © 2013 John Wiley & Sons, Ltd.

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