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The influence of the transition metal and the heteroatomic-bridge on the action of metallocene/methyl aluminoxane catalysts in ethylene polymerization and on the properties of the polymer

✍ Scribed by Raul Quijada; Jairton Dupont; Dione Corrêa Silveira; Márcia S. Lacerda Miranda; Rosângela B. Scipioni

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
277 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

This work reports a comparative study of the catalytic behaviour for a series of metallocenes derived from Ti, Zr, Hf and Nb, which after activation with methylaluminoxane can polymerize ethylene. Results show that the Zr metallocene with a -(CH3)2Si-bridge presents the highest activity, and the metallocenes based on Hf and Nb do not show any significant activity under the tested conditions.

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✍ Esa Kokko; Anneli Malmberg; Petri Lehmus; Barbro Löfgren; Jukka V. Seppälä 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 205 KB 👁 2 views

A study was made on the effects of polymerization conditions on the long-chain branching, molecular weight, and end-group types of polyethene produced with the metallocene-catalyst systems Et[Ind] 2 ZrCl 2 /MAO, Et[IndH 4 ] 2 ZrCl 2 /MAO, and (n-BuCp) 2 ZrCl 2 /MAO. Long-chain branching in the polye