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A completely discontinuous organic/inorganic hybrid nanocomposite based on reactions of [HMe2SiOSiO1.5]8 with vinylcyclohexene
N. Takamura, L. Viculis, R.M. Laine
bifunctional silsesquioxane, self-curing, nanocomposites
The reaction of 4-vinyl-1-cylcohexene with [HMe2SiOSiO1.5]8 (OHS) provides tetra and octa-2-cyclohexenylethyloctasilsesquioxanes. The tetrabifunctional [cyclohexenylethylMe2SiOSiO1.5]4-[HMe2SiOSiO1.5]4 (TCHSave, average degree of functionalization) melts near 80°C and can be cast and then cured (by thermal hydrosilylation) into transparent nanocomposite shapes. These materials, while not nanoporous, offer dielectric constants of 2.8-2.9 at (100 KHz to 3 MHz) and are air stable to temperatures ≥ 400 °C. The resulting materials appear (by XRD) to be partially ordered after curing. The octafunctional material, OCHS, also melts at low temperatures (≈ 120°C) and can be copolymerized with hydridosiloxanes to give similar materials with lower thermal stability. The synthesis and characterization of the starting materials is described, as well as thermal curing studies and properties characterization of the resultant nanocomposites.
International Polymers J.
2007
56
1378-1391
article