Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 67, Issue 7-8, Pages 1727-1733Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2006.06.012
Keywords
polyethylene; organoclay; nanocomposites; supported catalyst; in situ polymerization
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A new strategy for in situ polymerization was developed to prepare the polyethylene nanocomposites, in which a nickel alpha-diimine late-transition-metal catalyst supported on the AlEt3-activated organoclay was adopted to initiate the ethylene polymerization and to provide the reinforcement materials after the polymerization. It was found that the polymerization conditions such as reaction time, Al/Ni molar ratio, and reaction temperature affected the polymerization activity and the clay loading. The nanoscale dispersion of the clay layers in the polyethylene matrix was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). From the thermogravimetric analyses (TGA), it was found that the decomposition temperature of the nanocomposite with the organoclay of 11.91 wt% could be 46.8 degrees C higher than that of pure polyethylene when 30% weight loss was selected as a measuring point, showing enhanced thermal oxidation stability of this kind of polyolefin nanocomposites. (c) 2006 Elsevier Ltd. All rights reserved.
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