2008
DOI: 10.1021/om700942z
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Highly Active Binuclear Neutral Nickel(II) Catalysts Affording High Molecular Weight Polyethylene

Abstract: A series of new binuclear neutral κ2-N,O-chelated Ni(II) complexes [(H2C) n {[(2,6-R2-4-yl-C6H2)-NC(H)-(3,5-I2-2-O-C6H2)-κ2-N,O]Ni(CH3)(pyridine)}2] (R = iPr, 3,5-(CF3)2C6H3; n = 0, 1) are reported. The complexes are single-component catalyst precursors for ethylene polymerization. Catalyst activities exceed those of mononuclear analogues studied substantially. With 3.4 × 105 TO h−1, high molecular weight polymer is obtained (M w 9.2 × 105 g mol−1; M n 2.8 × 105 g mol−1). Semicrystalline polyethylene with a l… Show more

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Cited by 70 publications
(56 citation statements)
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“…7,11,1724 With systems a and b , ethylene polymerization activities are similar to mononuclear controls, but enhanced comonomer incorporation and activity occur in the copolymerization of ethylene with functionalized norbornene derivatives. 19,20 When activated with MAO, system e produces polymer with higher M w than some previously reported mononuclear systems.…”
Section: Introductionmentioning
confidence: 85%
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“…7,11,1724 With systems a and b , ethylene polymerization activities are similar to mononuclear controls, but enhanced comonomer incorporation and activity occur in the copolymerization of ethylene with functionalized norbornene derivatives. 19,20 When activated with MAO, system e produces polymer with higher M w than some previously reported mononuclear systems.…”
Section: Introductionmentioning
confidence: 85%
“…Examples of ethylene polymerizations performed in aqueous emulsions are common with nickel phenoxyiminato catalysts. 1417 …”
Section: Introductionmentioning
confidence: 99%
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“…The Ni-and Pd-based catalysts containing N-N , N-O [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68] , P-N [69][70][71][72] , P-P [73][74][75][76][77] and P-O [78][79][80][81][82][83][84] ligands have been synthesized and applied in ethylene polymerization to yield branched polymer. By comparison, the Ni and Pd-based catalysts containing N-N inherit stronger branched capability than other catalyst and can catalyze ethylene polymerization to produce branched polyethylene with more than 100 branches per 1000 carbons.…”
Section: Controlling the Branching Structure Of Polyethylenementioning
confidence: 99%