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A few considerations on some catalysts for olefin polymerization
Author(s) -
Luciani Luciano,
Milani Federico,
Zannetti Roberto,
Di Noto Vito
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930660107
Subject(s) - polymerization , olefin polymerization , catalysis , olefin fiber , ethylene , chemistry , polymer chemistry , propene , diffraction , organic chemistry , polymer , physics , optics
Among many precursors and catalysts for alpha‐olefins polymerization, one seems to be particularly interesting, because it has not been completely clarified yet. We refer especially to precursors obtained via reaction between Mg‐alkyls and SiCl 4 . The products of this reaction are not well known; in fact, under some operating conditions, a special form of MgCl 2 is obtained, showing x‐ray diffraction peaks in the angular region lower than 15° (2 theta), which corresponds to the 5.9 A interplanar spacing, characteristic of alpha‐MgCl 2 . Under other conditions, MgCl 2 is obtained in the well known and strongly disordered delta structure. By employing these precursors, some catalytic systems for alpha‐olefins polymerization have been prepared. In this paper, the peculiar aspects of these precursors and catalysts are described, particularly focusing on the correlation between structure and performances in ethylene and propylene polymerization.