Polymerization of methyl methacrylate using a metallocene catalyst system

Jiang, George J.; Hwu, Jyh Ming

doi:10.1002/(sici)1099-0518(20000401)38:7<1184::aid-pola18>3.3.co;2-n

Cited by 4 publications

(5 citation statements)

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“…Even lanthanocene chloride complexes, such as (CH 2 CHCH 2 C 5 H 4 ) 2 LnCl(THF) 2 ( 11 , Ln = Y, Sm, Dy, Er), were found to be active for MMA polymerization at 40 °C; however, the activity is low, with the yttrocene being the most active (7 h −1 TOF), and the polymerization is also uncontrolled . Likewise, Cp 2 YCl(THF) in combination with 1000 equiv of Et 2 Zn showed low MMA polymerization activity at 0 °C, producing at -PMMA with a broad MWD of 4.78 . Alkyl- or thienyl- substituted lanthanocene chloride complexes can also be activated with 10−20 equiv of AlEt 3 or NaH to a highly active system (with TOF reaching 800 h −1 for the NaH-activated system) for MMA polymerization, producing at -PMMA with broad (>2) or bimodal MWDs.…”

Section: Methacrylate Polymerizationmentioning

confidence: 99%

“…97 Likewise, Cp 2 YCl(THF) in combination with 1000 equiv of Et 2 Zn showed low MMA polymerization activity at 0 °C, producing at-PMMA with a broad MWD of 4.78. 98 Alkyl- 99 or thienyl-100 substituted lanthanocene chloride complexes can also be activated with 10-20 equiv of AlEt 3 or NaH to a highly active system (with TOF reaching 800 h -1 for the NaH-activated system) for MMA polymerization, producing at-PMMA with broad (>2) or bimodal MWDs. 102 Catalytic chain transfer is a highly efficient approach to control the MW of the polymers produced by free-radical polymerization.…”

Section: Nonbridged Lanthanocenesmentioning

confidence: 99%

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Coordination Polymerization of Polar Vinyl Monomers by Single-Site Metal Catalysts

2009

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Section: Methacrylate Polymerizationmentioning

confidence: 99%

Section: Nonbridged Lanthanocenesmentioning

confidence: 99%

Coordination Polymerization of Polar Vinyl Monomers by Single-Site Metal Catalysts

2009

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“…It is noteworthy that the MMA units were found to be mainly inserted in syndiotactic sequences, as indicated by the analysis of the triads (Figure 2), according to poly(MMA) samples obtained with the same catalytic systems 30. Indeed, rr triads showed a signal at 16.6 ppm much more intense than those at 18.7 and 21.1 ppm, related to mr and mm triads, respectively 35–37…”

Section: Resultsmentioning

confidence: 85%

Copolymerization of ethylene with methyl methacrylate by ziegler-natta-type catalysts based on nickel salicylaldiminate/methylalumoxane systems

Carlini

Martinelli

Galletti

et al. 2002

Macromol. Chem. Phys.

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Bis(salicylaldiminate)nickel(II) complexes, such as bis[N(2,6‐diisopropylphenyl) salicylaldiminate]nickel(II) and bis(N‐isopropylsalicylaldiminate)nickel(II), were activated by methylalumoxane (MAO) to give catalytic systems able to copolymerize ethylene (E) with methyl methacrylate (MMA), thus producing low molecular weight copolymers with a rather high content of MMA co‐units (50–80 mol‐%). On the contrary, when catalytic systems, obtained by oxidative addition of salicylaldimine ligands such as 5‐nitro‐N‐(2,6‐diisopropylphenyl)salicylaldimine (NPS) and 3,5‐dinitro‐N‐(2,6‐diisopropylphenyl)salicylaldimine (DNPS) to bis(cyclooctadienyl)nickel(0) [Ni(cod)2], were activated with MAO, high viscometric average molecular weight (Mv 10–30 × 104 Da) E/MMA copolymers with a low content of MMA co‐units (3–6 mol‐%) were formed, thus allowing to obtain directly by synthesis functionalized highly linear poly(ethylene)s (Tm up to 130 °C) to be potentially applied as new materials with improved surface properties.

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“…The extensively studied characteristics of polymers, such as thermal resistance, hardness, impact strength, and transparency, can be precisely controlled through the metallocene structure. Metallocene catalyst systems have been used to polymerize ethylene,19, 20 propylene,21 and methyl methacrylate monomers 22. Remarkably, the use of immobilized metallocene catalysts results in the formation of uniform polymer particles with a narrower size distribution and higher bulk density than those provided by metallocene immobilized catalysts 23.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polypropylene–montmorillonite nanocomposites generated by in situ metallocene catalyst polymerization

Hwu

Jiang

2005

J of Applied Polymer Sci

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An ion-exchange method was applied to replace sodium cations inside the interlamellar space of montmorillonite with positively charged stearyl trimethyl ammonium chloride. The d 001 -spacing of montmorillonite is larger in toluene than in other solvents. The overexchanged stearyl methyl ammonium chloride in the montmorillonite layers can be completely washed out by ethanol. Polypropylenemontmorillonite nanocomposites were prepared by using the supported rac-Et(Ind) 2 ZrCl 2 catalyst on the montmorillonite. The nanocomposites that were polymerized by the supported catalyst were characterized by infrared spectroscopy, nuclear magnetic resonance, X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and transmission electron microscopy. Transmission electron microcopy shows that each silicate sheet of montmorillonite is randomly dispersed into the polypropylene matrix following polymerization by using a supported catalyst. The polypropylene nanocomposites had higher crystallinity, hardness, and thermal properties than pure polypropylene. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 95: 1228 -1236, 2005

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Polymerization of methyl methacrylate using a metallocene catalyst system

Cited by 4 publications

References 0 publications

Coordination Polymerization of Polar Vinyl Monomers by Single-Site Metal Catalysts

Coordination Polymerization of Polar Vinyl Monomers by Single-Site Metal Catalysts

Copolymerization of ethylene with methyl methacrylate by ziegler-natta-type catalysts based on nickel salicylaldiminate/methylalumoxane systems

Preparation and characterization of polypropylene–montmorillonite nanocomposites generated by in situ metallocene catalyst polymerization

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