Morphology of nascent polyolefins prepared by Ziegler-Natta catalysis
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چکیده
منابع مشابه
First Principles Molecular Dynamics Study of Catalysis for Polyolefins: the Ziegler-Natta Heterogeneous System
We review part of our recent ab initio molecular dynamics study on the Ti-based Ziegler-Natta supported heterogeneous catalysis of α-olefins. The results for the insertion of ethylene in the metal-carbon bond are discussed as a fundamental textbook example of polymerization processes. Comparison with the few experimental data available has shown that simulation can reproduce activation barriers...
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Models for the likely active catalysts in homogeneous Ziegler-Natta systems have been studied using ab initio quantum chemical methods. We investigated the geometries of the isoelectronic model complexes, X2M-R where X = C1 or Cp = (q5-CsHs); where M = Sc and Ti+ (and also Ti); and where R = H, CH3, or SiH3. The general trend is that the M = Sc compounds strongly prefer a planar configuration, ...
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Mg(OEt)2 with spherical morphology is one of the most important precursors for the preparation of industrial Ziegler-Natta catalysts. In the present article, morphology evolution of Mg(OEt)2 particles is studied in the course of the synthesis. The morphology of Mg(OEt)2 particles is observed throughout the process by SEM. The results show that Mg(OEt)2 particles are formed through i) seed gener...
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Chapter 1 Motivated by the isolobal and isoelectronic relationship between the do CpW(CR) fragment and the do bent metallocene core, the synthesis and reactivity of alkyl complexes of the type CpW(CAd)R 2 (Ad = 1-adamantyl; R = alkyl, Cl, NMe 2 ) are presented. AdCN reacts with W2 (OCMe3 )6 to provide W(CAd)(OCMe 3)3, from which CpW(CAd)C12 may be prepared in three steps. Alkylation of CpW(CAd)...
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ژورنال
عنوان ژورنال: Journal of Polymer Science Part A-1: Polymer Chemistry
سال: 1969
ISSN: 0449-296X,1542-9350
DOI: 10.1002/pol.1969.150070325