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題名: | Silica-Supported Metallocenes:Effect of the Preparation Procedure on the Morphology of Polyethylene Particles |
作者: | Lin, Chiu-Hsun;Sheu, Chyi-Yang |
貢獻者: | 化學系 |
日期: | 2000-10
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上傳時間: | 2013-06-05T09:36:25Z
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出版者: | John Wiley & Sons, Inc. |
摘要: | Polyethylene (PE) particles are produced by a catalyst prepared by contacting a (C4H9Cp)2ZrCl2/MAO pre-mixing solution with SiO2 support. These particles have a large granular size and very few fine particles compared with those derived from a catalyst prepared by adsorption of (C4H9Cp)2ZrCl2 onto methylaluminoxane modified SiO2. The amount of Al in the pre-mixing catalyst has an important effect on its activity and the PE particle size distribution. The optimal concentration is about 30 wt.-%. The PE particles produced using a pre-mixing catalyst consist of globules with randomly oriented fiber structure on the surface, whereas those produced using adsorption catalysts have worm-like fibrils protruding from the PE globule surface. |
關聯: | Macromolecular Rapid Communications, 21(15): 1058-1062 |
顯示於類別: | [化學系] 期刊論文
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