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A Novel (SiO 2 /MgO/MgCl 2 )·TiCl x Ziegler – Natta Catalyst for Ethylene and Ethylene/1‐Hexene Polymerization
Author(s) -
Wang Jingwen,
Cheng Ruihua,
He Xuelian,
Liu Zhen,
Tian Zhou,
Liu Boping
Publication year - 2015
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201400599
Subject(s) - catalysis , titanium tetrachloride , magnesium , 1 hexene , polymerization , ethylene , ziegler–natta catalyst , polymer chemistry , titanium , calcination , chemistry , polyolefin , copolymer , natta , materials science , inorganic chemistry , organic chemistry , layer (electronics) , polymer
A novel (SiO 2 /MgO/MgCl 2 )·TiCl x Ziegler–Natta catalyst for ethylene and ethylene/1‐hexene polymerization is successfully developed through impregnation of aqueous solution of water‐soluble Mg‐compounds such as magnesium acetate on silica gel, and forming a supported thin layer of magnesium oxide on the surface of SiO 2 after high temperature calcination in dry air or oxygen, followed by further reacting with titanium tetrachloride to synthesize the magnesium dichloride carrier in situ and to support the titanium species simultaneously. The method is relatively simple and the resulting catalysts exhibit high activity, good hydrogen response, and copolymerization ability with high 1‐hexene incorporation. Unlike the traditional industrial Ti/Mg Ziegler–Natta catalysts using the relatively expensive, anhydrous and moisture‐sensitive MgCl 2 , Mg(OEt) 2 , MgR 2 or RMgCl as Mg‐sources, the most unique feature of this novel catalyst is its capability of utilization of any soluble Mg‐compounds and thus shows great potential for application in commercial gas‐phase polyolefin processes.