Nano-Sized Silica Supported Me2Si(Ind)2ZrCl2/MAO Catalyst for Ethylene Polymerization

被引:6
作者
Li, Kuo-Tseng [1 ]
Li, Cheng-Yu [1 ]
机构
[1] Tunghai Univ, Dept Chem Engn, Taichung 40704, Taiwan
关键词
metallocene catalysts; silicas; nanoparticles; supports; polyethylene; METALLOCENE CATALYSTS; PROPYLENE;
D O I
10.1002/app.34579
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Nano-sized and micro-sized silica particles were used to support a zirconocene catalyst [racemic-dimethylsilbis(1-indenyl)zirconium dichloride], with methylaluminoxane as a cocatalyst. The resulting catalyst was used to catalyze the polymerization of ethylene in the temperature range of 40-70 degrees C. Polyethylene samples produced were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and gel permeation chromatography (GPC). Nano-sized catalyst exhibited better ethylene polymerization activity than micro-sized catalyst. At the optimum temperature of 60 degrees C, nano-sized catalyst's activity was two times the micro-sized catalyst's activity. Polymers obtained with nano-sized catalyst had higher molecular weight (based on GPC measurements) and higher crystallinity (based on XRD and DSC measurements) than those obtained with micro-sized catalyst. The better performances of nano-sized catalyst were attributed to its large external surface area and its absence of internal diffusion resistance. SEM indicated that polymer morphology contained discrete tiny particles with thin long fiberous interlamellar links. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 1169-1175, 2012
引用
收藏
页码:1169 / 1175
页数:7
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