Novel Nickel(II)- and Palladium(II)-Based Catalytic Systems for the Synthesis of Hyperbranched Polymers from Ethene

Kim, Jang Sub; Pawlow, James H.; Wojcinski, Louis M.; Murtuza, Shahid; Kacker, Smita; Sen, Ayusman

doi:10.1021/ja9731128

Cited by 48 publications

(36 citation statements)

References 4 publications

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“…However, N1 deactivates rapidly at high temperature (60 8C). [17,18] Increasing ethylene pressure or decreasing the polymerization temperature led to polymer with higher melting temperature. N1 made polyethylene with lower melting temperature than N2 and N3.…”

Section: Ethylene Polymerization Using Homogeneous Nickel Diimine Catmentioning

confidence: 99%

Synthesis of Supported Nickel Diimine Catalysts for Ethylene Slurry Polymerization

Choi

Soares

2009

Macro Chemistry & Physics

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Ethylene slurry polymerizations were performed using supported nickel diimine catalysts. The effects of catalyst structure and polymerization conditions on catalyst activity, polymer particle morphology, and polymer properties were investigated. Covalently attached supported nickel diimine catalysts activated with ethyl aluminum sesquichloride (EASC) have high activities and made polymers with spherical morphology. Compared with the equivalent homogeneous catalysts, the covalently attached supported catalysts produced polyethylene with higher melting temperatures, higher molecular weights, and broader molecular weight distributions. Borates used as internal activator during the synthesis of these supported catalysts successfully activated the nickel diimine complexes.

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Section: Ethylene Polymerization Using Homogeneous Nickel Diimine Catmentioning

confidence: 99%

Synthesis of Supported Nickel Diimine Catalysts for Ethylene Slurry Polymerization

Choi

Soares

2009

Macro Chemistry & Physics

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“…Sen and coworkers 86,87 reported the synthesis of hyperbranched ethylene oligomers with a combiScheme 5. Synthesis of functional polymers with a chain-walking catalyst.…”

Section: Hyperbranched Oligomers By Transition-metal Catalystsmentioning

confidence: 99%

Z. Guan, Control of polymer topology through late‐transition‐metal catalysis, J Polym Sci Part A: Polym Chem (2003), 41(22), 3680–3692

Guan

2003

J. Polym. Sci. A Polym. Chem.

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ABSTRACT:In this article, recent examples are reviewed of late-transition-metal catalysis applied to polymer topology control. By the judicious selection or design of latetransition-metal catalysts, polymers with a broad range of topologies, including linear, short-chain-branched, hyperbranched, dendritic, and cyclic topologies, have been successfully synthesized. A distinctive advantage of the catalyst approach is that polymers with complex topologies can be prepared in one pot from simple commercial monomers. A fundamental difference of the catalyst approach with respect to other approaches is that the polymer topology is controlled by the catalysts instead of the monomer structure. In our own laboratory, we have successfully used two strategies to control the polymer topology with late-transition-metal catalysts. In the first strategy, hyperbranched polymers are prepared by the direct free-radical polymerization of divinyl monomers through control of the competition between propagation and chain transfer with a cobalt chain-transfer catalyst. In the second strategy, polyethylene topology is successfully controlled by the regulation of the competition between propagation and chain walking with the Brookhart Pd II -␣-bisimine catalyst.

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“…[17] Such materials are useful in the lubricant industry as base stocks and as precursors to lubricant additives, especially since the demand for synthetic lubricants is rising. [18] Complexes 6, 8 and 9 were investigated with regard to catalytic applications in ethylene oligomerization after ac- Table 2.…”

Section: Ethylene Oligomerization Studiesmentioning

confidence: 99%

Dipyridylamine Ligands − Synthesis, Coordination Chemistry of the Group 10 Metals and Application of Nickel Complexes in Ethylene Oligomerization

Schareina¹,

Hillebrand²,

Fuhrmann³

et al. 2001

Eur. J. Inorg. Chem.

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A great variety of 2,2Ј-bipyridylamines can be synthesized starting from primary amines or 2-aminopyridines (for instance, symmetrically and unsymmetrically substituted as well as chiral ligands) by palladium-catalyzed aryl amination. The reaction of such ligands with [PdCl 2 (COD)] or [NiBr 2 (DME)] (COD = cycloocta-1,5-diene; DME = 1,2-dimethoxyethane) led to the corresponding dichloro or dibromo complexes. The results of X-ray crystal structure analyses of

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Novel Nickel(II)- and Palladium(II)-Based Catalytic Systems for the Synthesis of Hyperbranched Polymers from Ethene

Cited by 48 publications

References 4 publications

Synthesis of Supported Nickel Diimine Catalysts for Ethylene Slurry Polymerization

Synthesis of Supported Nickel Diimine Catalysts for Ethylene Slurry Polymerization

Z. Guan, Control of polymer topology through late‐transition‐metal catalysis, J Polym Sci Part A: Polym Chem (2003), 41(22), 3680–3692

Dipyridylamine Ligands − Synthesis, Coordination Chemistry of the Group 10 Metals and Application of Nickel Complexes in Ethylene Oligomerization

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