Mechanochemical Route to Graphene-Supported Iron Catalysts for Olefin Polymerization and in Situ Formation of Carbon/Polyolefin Nanocomposites
| Autor: | W. Zhang, Ralf Thomann, Rolf Mülhaupt, Fabian Beckert, Simon Bodendorfer |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Ethylene
Materials science Polymers and Plastics Graphene Organic Chemistry Methylaluminoxane chemistry.chemical_element Polyethylene Polyolefin Catalysis law.invention Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering law Materials Chemistry Organic chemistry Graphite Carbon |
| Zdroj: | Macromolecules. 47:7036-7042 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma501602j |
| Popis: | A facile one-step mechanochemical process converts graphite into highly active graphene-supported iron catalysts for ethylene polymerization and the in situ formation of graphene/polyethylene nanocomposites. Key feature is the dry grinding of graphite in a steel ball mill under carbon dioxide pressure, affording high surface area edge-carboxylated graphene accompanied by simultaneous immobilization of Fe2+, formed by iron abrasion and electron transfer reaction. In contrast, as evidenced by Mossbauer spectroscopy, grinding graphite in the absence of carbon dioxide under nitrogen or argon pressure produces predominantly Fe0 together with Fe3+ supported on nitrogen-functionalized graphene or micronized graphite, respectively. On addition of bisiminopyridine (BIP) and activation with methylaluminoxane (MAO), only the Fe2+ catalyst supported on edge-functionalized graphene (Fe@MG-CO2) polymerizes ethylene in high yields, producing polyethylene with a molar mass of 180 kg/mol and a polydispersity of 6.1. Accor... |
| Databáze: | OpenAIRE |
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