ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Recently, a new charge percolation mechanism (CPM) of the Ziegler-Natta (ZN)polymerization of olefins by supported transition metal (Mt) complexes has been presented: amacromolecular chain is formed by polymerization of the monomer cluster (nM) adsorbed on thesupport (S) between two immobilized Mt ions, some in the higher (Mtn+1, i.e. acceptors) and theother in the lower (Mtn-1, i.e. donors) oxidation state:(Mtn-1...nM...Mtn+1)/S → (Mtn Mtn)/S + polymer.A special computer program «Lattice» has been developed to simulate olefin polymerization basedon CPM using a Monte Carlo procedure. The effects of reaction conditions (Mt concentration, Mt/Sratio, sequence of chemical components addition and time) of ethylene and propylenepolymerization by various Mt precursors (TiCl4/MgCl2, CrOx) and supports (MgCl2, SiO2) onmolecular mass and molecular mass distribution can be predicted by simulation and confirmed bypublished experimental results
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.518.381.pdf
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