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Dielectric Properties of Novel Polyurethane/Silica Nanowire Composites

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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.

Keywords: CONDUCTIVITY RELAXATION; ELECTRIC MODULUS; POLYURETHANE (PU)

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.1243

Publication date: October 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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