Propene polymerization catalyzed over MCM‐41 and VPI‐5‐supported Et(ind)₂ZrCl₂ catalysts

Abstract

Et(ind)zZrClz (C2H,(indenyl)zZrC12) confined inside regular pores of molecular sieves MCM-41 and VPIJ were prepared and used to polymerize propene with high activity. Stereoregularity, melting point and molecular weight of polypropene obtained were increased and the polymerization behavior was quite different from that prepared with homogeneous Et(ind)zZrC12. The small, regular and cylindrical pores of MCM-4 1 and VPI-5 suppress the formation of inactive binuclear complexes between metallocene and metallocene, or between metallocene and methylaluminoxane, resulting in stable active sites and high activity in propene polymerization. ' )Present address: Polymer Technology Lab.,

Effect of Zr-Modified SiO2-Supported Metallocene/MAO Catalyst on Copolymerization of Ethylene/1-Octene

“…Therefore, binding these metallocene catalysts onto inorganic supports as supported metallocene catalysts can overcome those drawbacks. Many inorganic supports such as SiO 2 , Al 2 O 3 , and MgCl 2 have been investigated [3][4][5][6][7][8][9]. It was reported that silica is perhaps the most attractive support so far.…”

Monomer- and polymer radicals of vinyl compounds: EPR and DFT studies of geometric and electronic structures in the adsorbed state

“…Since the MCM-41 mesoporous silica (with a hexagonal arrangement of the pores with 2-5 nm diameter) was invented at the beginning of the 1990's [15][16][17], applications of mesoporous molecular sieves in controlled polymerization have attracted much attention [18,19]. In contrast to zeolites these materials have the ability to encapsulate relatively large molecules.…”

Observation of bimodal polyethylene derived from TiO2-supported zirconocene/MAO catalyst during polymerization of ethylene and ethylene/1-hexene

“…It has been reported that many inorganic supports such as SiO 2 , Al 2 O 3 and MgCl 2 have been extensively studied. It was found that different supports could alter the catalytic behaviors during reaction as well [3][4][5][6][7].…”