期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 129, 期 4, 页码 766-767出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja066965l
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The 0-3 metal oxide-isotactic polypropylene nanocomposites are synthesized via in situ propylene polymerization using the C-2-symmetric metallocene catalyst dichloro[rac-ethylenebisindenyl]zirconium (IV) (EBIZrCl2) immobilized on methylaluminoxane (MAO)-treated barium titanate (BaTiO3) or titanium dioxide (TiO2) nanoparticles. The composite materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and C-13 nuclear magnetic resonance (NMR) spectroscopy. It is shown that the nanoparticles are homogeneously dispersed in the polyolefin matrices. Electrical measurements reveal nanocomposite leakage current densities of approximate to 10(-6) to 10(-9) A/cm(2), permittivities as high as 6.1, and breakdown strengths of approximate to 4 MV/cm. Energy densities are estimated to be as high as 9.4 J/cm(3).
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