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New synthesis of a highly active δ‐MgCl 2 for MgCl 2 /TiCl 4 /AlEt 3 catalytic systems
Author(s) -
Di Noto Vito,
Bresadola Silvano
Publication year - 1996
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.1996.021971126
Subject(s) - propene , catalysis , natta , magnesium , ziegler–natta catalyst , chemistry , metal , polymer chemistry , powder diffraction , infrared spectroscopy , inorganic chemistry , crystallography , nuclear chemistry , polymerization , organic chemistry , ethylene , polymer
Abstract A good supporting material for Ziegler‐Natta type catalysts was obtained by reaction between powdered metallic magnesium and 1‐chloro‐ n ‐C m H 2 m +1 ( m = 3–9). This reaction affords a highly disordered form of MgCl 2 which was characterized by FT‐IR spectroscopy and powder X‐ray diffraction (XRD) analysis. This MgCl 2 form shows a crystallographic disorder much higher than that exhibited by the products obtained following the commercial activation procedures of α‐MgCl 2 , either mechanical or chemical. As shown by the XRD spectra, the synthetized MgCl 2 is characterized by the typical structure of the δ‐form. Therefore, this MgCl 2 form, in view of its highly disordered structure, appears as a promising material for the preparation of active supported Ziegler‐Natta type catalysts. Thus, by titanation of the obtained δ‐MgCl 2 we have prepared some supported catalysts which have been tested in the slurry propene polymerizations, showing high activity (136000–138000 gPP/gTi) and good stereoselectivity (82–88% I.I.).