Temperature dependence of copolymerization parameters in ethene/1-octene copolymerization using homogeneous rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2/MAO catalyst

✍ Scribed by J. Suhm; M. J. Schneider; R. Mülhaupt

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 148 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199703)35:4<735::aid-pola18>3.0.co;2-o

✦ Synopsis

Ethene was copolymerized with 1-octene using homogeneous MAO-activated rac-Me 2 Si(2-MeBenz[e]Ind) 2 ZrCl 2 at constant ethene concentration with temperature varying between 0 and 60ЊC to determine a temperature dependence of copolymerization parameters. At constant 1-octene and ethene concentration (constant ethene/1octene feed molar ratio) 1-octene incorporation decreased with increasing temperature. Furthermore, when ethene/1-octene molar ratio was varied by varying the temperature keeping 1-octene concentration and ethene pressure constant, increasing temperature accounted for lower molecular masses without affecting 1-octene incorporation. An explanation for the observed temperature dependence of the copolymerization parameters is presented, considering the solution-enthalpy of the gaseous ethene in the solvent. In all cases amorphous poly(ethene-co-1-octene) with 1-octene content varying between 20 and 40 mol % was obtained.