Polymer Bulletin, Vol.37, No.1, 35-41, 1996
Propylene Polymerization with Unbridged Rac-bis(1-(P-Tolyl)Indenyl)Dichloro or Meso-bis(1-(P-Tolyl)Indenyl)Dichloro Zirconium/Methylaluminoxane Catalyst
A novel unbridged metallocene complex, (1-TolInd)(2)ZrCl2 (Tol = p-C6H4CH3) was prepared. Meso-like (1-TolInd)(2)ZrCl2 afforded a syndiotactic-dominant polypropylene having a short syndiotactic length at low temperatures (-30 degrees C). This stereosequence is due either to a weakly chain-end controlled or to a syndiotactic site controlled polymerization with site isomerization. Racemic isomer produced a completely atactic PP even at -30 degrees C.
Keywords:STEREOSELECTIVE PROPENE POLYMERIZATION;METALLOCENE METHYLALUMOXANE CATALYSTS;ALUMOXANE CATALYST;ZIRCONOCENE;DERIVATIVES;DICHLORIDE;COMPLEXES