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Ziegler‐Natta/Metallocene Hybrid Catalyst for Ethylene Polymerization
Author(s) -
Ahmadi Mostafa,
Jamjah Roghieh,
Nekoomanesh Mehdi,
Zohuri Gholam Hossein,
Arabi Hassan
Publication year - 2007
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200700027
Subject(s) - metallocene , polyethylene , natta , polymerization , induction period , polymer chemistry , catalysis , ethylene , materials science , ziegler–natta catalyst , polymer , molar mass distribution , chemical engineering , chemistry , organic chemistry , composite material , engineering
A Ziegler‐Natta/metallocene hybrid catalyst was produced and utilized in the polymerization of ethylene with the aim of producing bimodal polyethylene. The MgCl 2 adduct was prepared by a melt quenching method and Cp 2 ZrCl 2 and TiCl 4 catalysts were loaded, respectively, after treating the surface with TiBAl. The polymerization kinetics involved an induction period, followed by fragmentation and expansion of particles. SEM micrographs revealed that the spherical morphology was retained through the initial mild reaction conditions of induction period. The polymers produced showed bimodal molecular weight distribution patterns, suggesting that both components of the hybrid catalyst were active over the support.