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The Influence of Bridge Type on the Activity of Supported Metallocene Catalysts in Ethylene Polymerization

Chinese Journal of Polymer Science 2014年第2期32卷 137-142页

作者： Alireza Talaei Faramarz Afshar Taromi ahmad arefazar Saeid ahmadjo Omid Moini Jazani Department of Polymer Engineering and Color Technology Amirkabir University of Technology Department of Catalyst Iran Polymer and Petrochemical Institute (IPPI) Department of Chemical Engineering College of Engineering University of Isfahan

Ethylene polymerization was carried out by immobilization of rac-ethylenebis（1-indenyl）zirconium dichloride （Et（Ind）2ZrCl2） and rac-dimethylsilylbis（1-indenyl）zirconium dichloride （Me2Si（Ind）2ZrCl2） preactivated with methylaluminoxane （MAO） on calcinated silica at different temperatures. Polymerizations of ethylene were conducted at different temperatures to find the optimized polymerization temperature for maximum activity of the catalyst. The Me2Si bridge catalyst showed higher activity at the lower polymerization temperature compared to the Et bridge catalyst. The highest catalytic activities were obtained at temperatures about 50 ~C and 70 ~C for Me2Si（Ind）2ZrC1JMAO and Et（Ind）zZrCI2/MAO catalysts systems, respectively. Inductively coupled plasma-atomic emission spectroscopy results and polymerization activity results confirmed that the best temperature for calcinating silica was about 450 ℃ for both catalysts systems. The melting points of the produced polyethylene were about 130 ℃, which could be attributed to the linear structure of HDPE.

关键词： Slurry polymerization Olefin polymerization ansa-Metallocene Silica support.

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Optimise Toughening of PA6/HDPE/Nanoclay/ SEBS-g-MA Based Nanocomposite Systems

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材料科学与工程（中英文A版） 2012年第9期2卷 642-647页

作者： Marzieh Attari ahmad arefazar Gholamreza Bakhshandeh Polymer Engineering Department Islamic Azad University south of Tehran branch Iran Polymer Engineering Department Amirkabir University of Technology Tehran Iran Rubber Processing and Engineering Department Iran Polymer & Petrochemical Institute Tehran lran

The nanocomposite of PA6/high density polyethylene (HDPE)/SEBS-g-MA/modified by nanoclay was prepared by melting compounding in an Extruder Co rotating Twin Screw. The morphology & toughening properties of this nanocomposie were studied to find a best, optimum composition which there is a clear trade-off between stiffness versus toughness. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to evaluate the effects of the Organo-Clay additions and created exflosite on the structure of prepared nanocomposites. The results confirmed formation of simultaneous existence exfoliated and intercalated structures in this system also Scanning electron microscopy (SEM) test was used to evaluate and determine the morphology and the compatibility between PA6 and HDPE polymers. The tensile properties and impact strength of these toughened nanocomposites are discussed in terms of the montmorillonite (MMT) and SEBS-g-MA contents and morphology as well.

关键词：纳米复合物复合系统增韧最佳化双螺杆挤出机纳米复合材料透射电子显微镜扫描电子显微镜

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