Metallocene-Catalyzed Solution Polymerization of Ethene at Elevated Pressure

✍ Scribed by Hans Peter Dornik; Gerhard Luft; Alexander Rau; Thomas Wieczorek

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 77 KB
• Volume: 288
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200350001

✦ Synopsis

Abstract

The kinetic of ethene polymerization catalyzed by (^n^BuCp)~2~ZrCl~2~/Al^i^Bu~3~/[Me~2~PhNH]^+^[B(C~6~F~5~)~4~]^−^ has been investigated at 100 and 140 °C at pressures from 2 to 7 MPa. The initial polymerization rate R~p0~ increases linearly with increasing catalyst concentration, whereas a second‐order dependence of R~p0~ on the ethene concentration is found the number‐average molecular weight M~n~ increases with increasing ethene pressure (ethene concentration). The relation between M~n~ and ethene concentration can be explained by an equation based on a kinetic model involving a single center, two‐state catalyst system.

Influence of the Zr concentration on the initial polymerization rate R~p0~. p~Ethene~ = 7 MPa, solvent (toluene/ethene) = 275 mL.

magnified imageInfluence of the Zr concentration on the initial polymerization rate R~p0~. p~Ethene~ = 7 MPa, solvent (toluene/ethene) = 275 mL.