Dielectric Properties of Novel Polyurethane/Silica Nanowire Composites
Abstract:An aliphatic isocyanate, polyether, polyol thermoplastic polyurethane, Tecoflex® SG-85A, was solution processed with the varying amounts of silica nanowire. The dielectric permittivity (′) and loss factor (″) were measured via Dielectric Analysis (DEA) in the frequency range 1 Hz to 100 kHz and between the temperature −150 to 150 °C. The electric modulus formalism was used to reveal α, and conductivity relaxations. The activation energies for the relaxations are presented. Nanocomposites were also characterized by differential scanning calorimetry (DSC) to determine glass transition temperatures. The onset of decomposition temperature was measured by thermo-gravimetric analysis (TGA). Scanning electron microscopy (SEM) provided images of the polymer-nanocomposites.
Document Type: Research Article
Publication date: October 1, 2009
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