Metallocene Catalyzed Alternating Copolymerization of Olefins

Beulich, Inken; Freidanck, Frank; Schauwienold, Anne-Meike; Weingarten, Ulrich; Arndt‐Rosenau, Michael; Kaminsky, Werner

doi:10.1007/978-3-642-60178-1_43

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Table 2 Although the mechanism of copolymerizations is not totally clear yet, analysis shows the formation of oddand even-numbered ethene sequences. 21 The additional NEENE/ENEEN pentad gives resonances of C γ1 and C Rδ1 which contribute to the peaks at 30.3 (D3) and 30.5 ppm (D4). At the same norbornene content the signal intensity distribution of copolymers produced by [Me 2 C-(3-MeCp)(Flu)]ZrCl 2 /MAO differs from that found in the copolymers produced by [Me 2 C(3-tBuCp)(Flu)]ZrCl 2 / MAO.…”

Section: Chart 2 Denomination Of Ethene-centered Pentads and Carbonsmentioning

confidence: 98%

“…At the same norbornene content the signal intensity distribution of copolymers produced by [Me 2 C-(3-MeCp)(Flu)]ZrCl 2 /MAO differs from that found in the copolymers produced by [Me 2 C(3-tBuCp)(Flu)]ZrCl 2 / MAO. 21 Ethene/NorborneneCopolymersContainingBlocks. Comparison of ethene/norbornene copolymers produced by different catalysts shows that they may be divided into three subtypes according to their 13 C NMR spectra, but a full interpretation of the 13 C NMR spectra has not been achieved until now.…”

Section: Chart 2 Denomination Of Ethene-centered Pentads and Carbonsmentioning

confidence: 99%

“…These polymers can be investigated by high-resolution 13 C NMR spectroscopy. Although the mechanism of copolymerizations is not totally clear yet, analysis shows the formation of odd- and even-numbered ethene sequences . The additional NEENE/ENEEN pentad gives resonances of C βγ 1 and C αδ 1 which contribute to the peaks at 30.3 (D3) and 30.5 ppm (D4).…”

Section: Introductionmentioning

confidence: 99%

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Microstructure of Ethene/Norbornene Copolymers

Arndt‐Rosenau

Beulich

1999

Macromolecules

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The microstructure of ethene/norbornene copolymers produced by metallocene/methylaluminoxane catalysts is investigated by 13 C NMR spectroscopy. The microstructure of alternating copolymers is assigned on the pentad level by comparison of the pentad distribution in 13 C NMR spectra with the calculated distribution according to the alternating mechanism. Norbornene block structures produced with different catalysts are compared, and norbornene diblock structures are assigned. Triad distributions for the alternating copolymers and diad distributions for copolymers containing diblocks were obtained.

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Section: Chart 2 Denomination Of Ethene-centered Pentads and Carbonsmentioning

confidence: 98%

Section: Chart 2 Denomination Of Ethene-centered Pentads and Carbonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure of Ethene/Norbornene Copolymers

Arndt‐Rosenau

Beulich

1999

Macromolecules

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“…A possible mechanism of stereocontrol is alternated insertion between isospecific (norbornene insertion) and aspecific sites (ethylene insertion). Arndt-Rosenau has used MAO-activated Me 2 C(3- i PrCp)(Fl)ZrCl 2 to form this polymer with a melting point as high as 320 °C 34 Isotactic Poly(ethylene- a lt -norbornene) …”

Section: Other Copolymersmentioning

confidence: 99%

Precise Control of Polyolefin Stereochemistry Using Single-Site Metal Catalysts

2000

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Geoffrey W. Coates was born in 1966 in Evansville, IN. He received a B.A. degree in chemistry from Wabash College in 1989 working with Roy G. Miller and a Ph.D. in organic chemistry from Stanford University in 1994 with Robert M. Waymouth. After postdoctoral research with Robert H. Grubbs at the California Institute of Technology, he joined the faculty at Cornell University in 1997, where he is now Assistant Professor of Chemistry and Chemical Biology. His research interests include the development of single-site catalysts for synthesis and the preparation and characterization of well-defined polymer architectures.

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Polymerization – Homogeneous

Vlád

2002

Encyclopedia of Catalysis

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Polymers are among the largest manufactured industrial products. Their extremely diversified properties render a widespread presence possible in everyday life. Polymers can be synthesized either by homogeneous or heterogeneous processes. This article focuses on the homogeneous procedures. The first part of the article summarizes the polymerization of monomers containing at least one carbon–carbon double bond or carbon–carbon triple bond. This is followed by a description of the environmentally accepted and biocompatible poly(lactic acid)s and epoxide–carbon dioxide alternating copolymers. The next two paragraphs focus on special procedures, living and enzymatic polymerization, by which polymers can be synthesized with exotic architectures. The article concludes is finished with the description of step‐growth polymerizations of aromatic systems.

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Metallocene Catalyzed Alternating Copolymerization of Olefins

Cited by 4 publications

References 3 publications

Microstructure of Ethene/Norbornene Copolymers

Microstructure of Ethene/Norbornene Copolymers

Precise Control of Polyolefin Stereochemistry Using Single-Site Metal Catalysts

Polymerization – Homogeneous

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