Synthesis and Characterization of Nanocomposite Films Consisting of Vanadium Oxide and Microphase-separated Graft Copolymer

  • Choi, Jin-Kyu (Department of Chemical Engineering, Yonsei University) ;
  • Kim, Yong-Woo (Department of Chemical Engineering, Yonsei University) ;
  • Koh, Joo-Hwan (Department of Chemical Engineering, Yonsei University) ;
  • Kim, Jong-Hak (Department of Chemical Engineering, Yonsei University) ;
  • Mayes, Anne M. (Department of Materials Science and Engineering, Massachusetts Institute of Technology)
  • Published : 2007.10.31

Abstract

Nanocomposite films were prepared by sol-gel synthesis from vanadium triisopropoxide with $poly((oxyethylene)_9$ methacrylate)-graft-poly(dimethyl siloxane), POEM-g-PDMS, producing in situ growth of vanadium oxide within the continuous ion-conducting POEM domains of micro phase-separated graft copolymer. The formation of vanadium oxide was confirmed by wide angle x-ray scattering (WAXS) and Fourier transform infrared (FT-IR) spectroscopy. Small angle x-ray scattering (SAXS) revealed the spatially-selective incorporation of vanadium oxide in the POEM domains. Upon the incorporation of vanadium oxide, the domain periodicity of the graft copolymer monotonously increased from 17.2 to 21.0 nm at a vanadium content 14 v%, above which it remained almost invariant. The selective interaction of vanadium oxide with POEM was further verified by differential scanning calorimetry (DSC) and FT-IR spectroscopy. The nanocomposite films exhibited excellent mechanical properties $(l0^{-5}-10^{-7}dyne/cm^2)$, mostly due to the confinement of vanadium oxide in the POEM chains as well as the interfaces created by the microphase separation of the graft copolymer.

Keywords

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