Ethylene Homo-and Copolymerization Using a Bis-IndZrcl2 Metallocene Catalyst: Structural Composition Distribution of the Copolymer

Abstract

A bis-IndZrCl2 catalyst was synthesized and used for ethylene homo- and copolymerization.<br><br>The activity of the catalyst increases with increasing Al/Zr ratio; optimum activity was<br><br>reached at 60 8C. Mv of the polymer decreased as the polymerization temperature increased;<br><br>increasing reaction pressure increased bothMv<br><br>and catalyst activity. The copolymerization of<br><br>ethylene with different a-olefins was studied<br><br>using the same catalyst system. The results<br><br>indicate that under identical conditions there<br><br>was a general decrease in the rate of polymeri-<br><br>zation as compared to the homopolymeriza-<br><br>tion. The CCD and the lamellar thickness were<br><br>investigated using DSC. The heterogeneity of<br><br>the CCD increasedwith increasing comonomer<br><br>content and molar mass.