Exchange reactions between dialkylzirconocene and alkylaluminium compounds

Siedle, A. R.; Newmark, Richard A.; Lamanna, W. M.; Schroepfer, J.N.

doi:10.1016/s0277-5387(00)80583-5

Cited by 90 publications

(73 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This can be explained by the formation of inactive hydride compounds by ␤-H abstraction (TEA and TIBA). 19,20 DEAC showed lower catalytic activity than TEA because of its deficiency for alkyls. Figures 13 and 14 show the TMA/MAO and TMA/SMAO mole ratio effects on catalytic activity with homogeneous and in-situ-supported Et[Ind] 2 ZrCl 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of experimental conditions on ethylene polymerization within-situ-supported metallocene catalyst

Chu

Soares

Penlidis

2000

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Effect of experimental conditions on ethylene polymerization within-situ-supported metallocene catalyst

Chu

Soares

Penlidis

2000

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

“…The intensity of the even-chain species 6 never surpasses the intensity of the odd-chain species 7, consistent with the results of previous investigations. 12,14,15 We observe a dramatic increase in intensity with time of polymeric products at m/z 400 to 500, especially the odd-chain polymeric product at m/z 403, corresponding the addition of six ethylene subunits to ion 2 and the even-chain polymeric product at m/z 361, corresponding to the addition of five ethylene subunits to ion 5 (see Figure 4a and 4b). Over time, these peak intensities dramatically decreased and the intensity of polymeric products with narrow polydispersity from m/z 400 to 700 (see Figures 4b and 4c) increased.…”

mentioning

confidence: 85%

Droplet Spray Ionization from a Glass Microscope Slide: Real-Time Monitoring of Ethylene Polymerization

Jiang

Zou

et al. 2015

Anal. Chem.

View full text Add to dashboard Cite

Ambient ionization mass spectrometry is achieved in a simple manner by loading a sample solution onto a corner of a microscope cover glass positioned in front of the inlet to a mass spectrometer and applying a high voltage to the sample. The resulting stream of charged droplets is stable, has no contamination from the substrate platform, and can be used repeatedly. The utility of droplet spray for in situ analysis and real-time monitoring of chemical reactions was demonstrated by the bis(cyclopentadienyl)zirconium dichloride (zirconocene dichloride)/methylaluminoxane, Cp2ZrCl2/MAO, homogeneously catalyzed polymerization of ethylene in various solutions. Reaction times ranged from seconds to minutes, and catalytically active species and polymeric products of ethylene were acquired and identified by tandem mass spectrometry.

show abstract

“…The scale of MAO species ranges from low molecular oligomers in the form of chains or cycles up to cages of different sizes. Also, free TMA appears in low concentrations 31–38. All MAO species can be transformed into one another in dynamic equilibrium reactions mediated by TMA.…”

Section: Resultsmentioning

confidence: 99%

Microgels as new support materials for heterogeneous cocatalysts in ethylene polymerization reactions

Helldörfer

Alt

Ebenhoch³

2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

Microgels are monodisperse poly(organosiloxane) microparticles that can be functionalized at their surface. These materials were tested as supports for heterogeneous cocatalysts of the methylaluminoxane type and were used for the polymerizations of olefins with transitionmetal catalysts. The cocatalysts were synthesized directly on the surfaces of the microgel particles by the partial hydrolysis of trimethylaluminum and were then used for the activation of homogeneous catalyst precursors. Complexes of various chemical natures were successfully activated and optimized through variations in the Al/H 2 O ratio used for the synthesis. Metallocene dichloride complexes and coordination compounds of iron and nickel were tested as catalysts for ethylene polymerization, and the results were compared with the results for the homogeneous systems and heterogeneous systems supported on silica gel (SiO 2 ).

show abstract

Exchange reactions between dialkylzirconocene and alkylaluminium compounds

Cited by 90 publications

References 36 publications

Effect of experimental conditions on ethylene polymerization within-situ-supported metallocene catalyst

Effect of experimental conditions on ethylene polymerization within-situ-supported metallocene catalyst

Droplet Spray Ionization from a Glass Microscope Slide: Real-Time Monitoring of Ethylene Polymerization

Microgels as new support materials for heterogeneous cocatalysts in ethylene polymerization reactions

Contact Info

Product

Resources

About