Effects of the Linking of Cyclopentadienyl and Ketimide Ligands in Titanium Half‐Sandwich Olefin Polymerization Catalysts
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DOI: 10.1002/cctc.201700498
Abstract: The role of the ketimide ligand geometry in Ti half‐sandwich complexes and the consequent effects in olefin polymerization catalysis (ethylene, styrene, 1‐hexene polymerization, and ethylene/1‐hexene copolymerization) were investigated under various conditions. [CpTiCl2(N=CtBu2)] (1; Cp=η5‐cyclopentadienyl) was used… read more here.
Keywords: cyclopentadienyl; polymerization; polymerization catalysts; olefin polymerization ... See more keywords
Strain effect and dual initiation pathway in CrIII/SiO2 polymerization catalysts from amorphous periodic models
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DOI: 10.1016/j.jcat.2016.11.037
Abstract: Abstract Heterolytic C H bond activation of ethylene on Cr III O has been proposed as the initial step in olefin polymerization on ( SiO) 3 Cr III active sites of molecularly-defined analogues of the… read more here.
Keywords: polymerization; initiation; polymerization catalysts; amorphous periodic ... See more keywords
Elucidating Secondary Metal Cation Effects on Nickel Olefin Polymerization Catalysts
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DOI: 10.1021/acscatal.0c02949
Abstract: Secondary metal cations, such as alkali and transition metal ions, have been shown to enhance the catalytic performance of nickel and palladium olefin polymerization catalysts. Their beneficial eff... read more here.
Keywords: secondary metal; elucidating secondary; polymerization catalysts; olefin polymerization ... See more keywords
Advancing the Compositional Analysis of Olefin Polymerization Catalysts with High-Throughput Fluorescence Microscopy
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DOI: 10.1021/jacs.2c09159
Abstract: To optimize the performance of supported olefin polymerization catalysts, novel methodologies are required to evaluate the composition, structure, and morphology of both pristine and prepolymerized samples in a resource-efficient, high-throughput manner. Here, we report on… read more here.
Keywords: fluorescence microscopy; polymerization catalysts; microscopy; olefin polymerization ... See more keywords
Union carbide polymerization catalysts: from uncovering active site structures to designing molecularly-defined analogs
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DOI: 10.1039/d2sc04235e
Abstract: The Union Carbide (UC) ethylene polymerization catalysts, based on chromocene dispersed on silica, show distinct features from the Phillips catalysts, but share the same heated debate regarding the structure of their active sites. Based on… read more here.
Keywords: 600 600; active site; polymerization catalysts; union carbide ... See more keywords