Journal ArticleDOI
New polymers by homogenous zirconocene/aluminoxane catalysts
Reads0
Chats0
TLDR
The glass transition temperature of norbornene/ethene copolymers exceeds 130°C as discussed by the authors, which is the glass transition point of cyclopentene with propene.Abstract:
With homogenous catalysts on the basis of chiral metallocenes and methylaluminoxane it has become possible to polymerize cyclic olefins like cyclobutene, cyclopentene or norbornene. No ring opening reaction occurs. The crystalline polycycloalkenes show extremly high melting points between 400 and 600°C. Copolymers of cyclopentene with propene are amorphous. They have a low molecular weight and glass transition point. On the other hand the glass transition temperature of norbornene/ethene copolymers exceeds 130°C. These copolymers could be used as materials for optical discs and fibers.read more
Citations
More filters
Journal ArticleDOI
Stereospezifische Olefinpolymerisation mit chiralen Metallocenkatalysatoren
Journal ArticleDOI
Homogeneous group 4 metallocene ziegler-natta catalysts: The influence of cyclopentadienyl-ring substituents
Petra C. Möhring,Neil J. Coville +1 more
TL;DR: In this article, a new range of metallocene catalysts, Cp 2 MCl 2 (M = Ti, Zr, Hf) has been developed in the past decade, which, in the presence of alumoxanes are highly efficient at polymerizing α-olefins (ethene, propene, etc.).
Journal ArticleDOI
Highly active metallocene catalysts for olefin polymerization
TL;DR: The story of the discovery of the metallocene-methylaluminoxane catalysts for olefin polymerization is reviewed from its conception up until the first commercial production of polymers in this paper.
Journal ArticleDOI
The discovery of metallocene catalysts and their present state of the art
TL;DR: In this paper, the development of the metallocene/MAO-catalysts from their discovery to their present state-of-the-art is presented, and a better understanding of the mechanism of olefin polymerization leads to findings of other new single site catalysts.
Book ChapterDOI
Metallocenes for Polymer Catalysis
Walter Kaminsky,Michael Arndt +1 more
TL;DR: In this article, the effect and influence of the ligands can more and more be predicted and understood by molecular modeling and other calculations, and it is possible to tailor the microstructure of polymers by changing the ligand structure of the metallocene.
References
More filters
Journal ArticleDOI
Syndiospecific propylene polymerizations with Group IVB metallocenes.
Book ChapterDOI
Ziegler-Natta Catalysis
Hansjörg Sinn,Walter Kaminsky +1 more
TL;DR: In this article, the authors discuss the scope of Ziegler catalysis, stereoselectivity, kinetics, and mechanism of homogeneous Natta catalysts; and side reactions in homogeneous catalysts.
Journal ArticleDOI
Mechanisms of stereochemical control in propylene polymerizations with soluble Group 4B metallocene/methylalumoxane catalysts
TL;DR: In this article, a polypropene isotactique avec des catalyseurs de Ziegler-Natta solubles, determination de la microstructure stereochimique et information concernant le mecanisme de reaction
Journal ArticleDOI
Polymerization of Propene and Butene with a Chiral Zirconocene and Methylalumoxane as Cocatalyst
TL;DR: In this article, the chiral ethylenebis(4,5,6,7-tetrahydro-lindeny1)zirconium dichloride is used in combination with methylalumoxane ([AI(CH3)-O],) as cocatalyst, highly isotactic polypropylene is obtained.
Related Papers (5)
Copolymerization of norbornene and ethene with homogenous zirconocenes/methylaluminoxane catalysts
Walter Kaminsky,A. Noll +1 more
Cycloolefin-copolymere: Eine neue klasse transparenter thermoplaste†
Ethylene/Norbornene Copolymerizations with Titanium CpA Catalysts
Ethene-Norbornene Copolymerization Using Homogenous Metallocene and Half-Sandwich Catalysts: Kinetics and Relationships between Catalyst Structure and Polymer Structure. 2. Comparative Study of Different Metallocene- and Half-Sandwich/Methylaluminoxane Catalysts and Analysis of the Copolymers by 13C Nuclear Magnetic Resonance Spectroscopy.
Dieter Ruchatz,Gerhard Fink +1 more