Stereospecific polymerization by metallocene/aluminoxane catalysts

Kaminsky, Werner; Bark, Andreas; Steiger, R.

doi:10.1016/0304-5102(92)80228-9

Cited by 155 publications

(78 citation statements)

References 12 publications

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“…7,17 Their superior properties include high glass transition temperatures, excellent optical transparency, low birefringence and good solubility in common organic solvents and serve as reasons for the increased interest. 7,17 Many transition metal complexes including titanium, 18,19 zirconium, 20,21 31 We report herein the preparation of new nickel (II) complexes bearing a fluorinated β-diketiminate backbone ligands. The catalytic polymerization of norbornene was investigated when activated by MAO.…”

Section: Introductionmentioning

confidence: 99%

Nickel (II) complexes supported by a fluorinated β‐diketiminate backbone ligand: synthesis, catalytic activity toward norbornene polymerization, and the oxygenated species

Jiang

Wang

et al. 2006

Applied Organom Chemis

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Section: Introductionmentioning

confidence: 99%

Nickel (II) complexes supported by a fluorinated β‐diketiminate backbone ligand: synthesis, catalytic activity toward norbornene polymerization, and the oxygenated species

Jiang

Wang

et al. 2006

Applied Organom Chemis

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“…The polymerization of NB can be achieved with some selected catalyst systems based on metallocenes 6,10,11 or Pd(II) and Ni(II) complexes. 4,5,[7][8][9][12][13][14] Metallocene-based systems lead to a stereospecific homopolymer, but the monomer conversion rate is rather low.…”

Section: Introductionmentioning

confidence: 99%

Homopolymerization and copolymerization of tert‐butyl methacrylate and norbornene with nickel‐based methylaluminoxane catalysts

Huang

Wang

Kuo

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The homopolymerization and copolymerization of tert-butyl methacrylate (tBMA) and norbornene (NB) with nickel(II) acetylacetonate in combination with methylaluminoxane were systematically investigated. This catalytic system showed high activity toward the homopolymerization of both NB and tBMA. For these copolymerizations, activity was gradually lost with an addition of tBMA to NB or of NB to tBMA. This result was qualitatively explained with the trigger coordination mechanism. Furthermore, the determination of the reactivity ratios indicated a significantly higher reactivity for NB than for tBMA (r NB ϭ 4.14 and r tBMA ϭ 0.097), and this was interpreted by the coordination mechanism. The synthesized acrylate/NB copolymers exhibited glass-transition temperatures of 100 -250°C. The absence of crystallinity and the homogeneous repartition of the monomer units along the main chain yielded products with high transparency and high stability

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“…While the catalytic activities of the heterogeneous catalyst and homogeneous catalyst were relatively similar, the activity of the silica-supported catalyst at a temperature beyond 508C was much higher than that of the homogeneous metallocene catalyst. It is suggested that the bimolecular deactivation process 12 usually observed in a homogeneous catalyst system is inhibited by the site isolation effect in the heterogeneous catalyst. In other words, the active site of silica-supported metallocene catalyst appears to be thermally stable.…”

Section: Effect Of Polymerization Temperaturementioning

confidence: 98%

Comparison of catalytic behaviors of various silica‐supported metallocene catalysts in syndiospecific polymerization of styrene

Yim

Ihm

2006

J of Applied Polymer Sci

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Homogeneous metallocene catalysts and several kinds of silica-supported metallocene catalysts were employed to investigate their catalytic behavior for styrene polymerization. Half metallocene directly supported on silica catalysts showed better performance than metallocene supported on silica treated with aluminum compounds with regard to syndiospecific styrene polymerization. The silica-supported metallocene catalysts had optimum conditions for Al/Ti mole ratio and polymerization temperature. Among these, the Cp*TiCl 3 / SiO 2 catalyst showed fairly good catalytic activity and yielded enhanced properties of syndiotactic polystyrene, even at a relatively low (< 300) Al/Ti mole ratio in styrene polymerization. Active sites formed on SiO 2 appear to be more thermally stable as compared with their homogeneous counterparts.

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Stereospecific polymerization by metallocene/aluminoxane catalysts

Cited by 155 publications

References 12 publications

Nickel (II) complexes supported by a fluorinated β‐diketiminate backbone ligand: synthesis, catalytic activity toward norbornene polymerization, and the oxygenated species

Nickel (II) complexes supported by a fluorinated β‐diketiminate backbone ligand: synthesis, catalytic activity toward norbornene polymerization, and the oxygenated species

Homopolymerization and copolymerization of tert‐butyl methacrylate and norbornene with nickel‐based methylaluminoxane catalysts

Comparison of catalytic behaviors of various silica‐supported metallocene catalysts in syndiospecific polymerization of styrene

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