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- Title
Tailoring Hexagonal Gibbsite Single Crystal Nanoplatelets for Ethylene Polymerization and Nanocomposite Formation on MAO‐Free Heterogeneous Bis(imino)pyridine Iron(II) Catalyst.
- Authors
Zhong, Fan; Schwabe, Jeremia; Thomann, Ralf; Mülhaupt, Rolf
- Abstract
Ultrathin single crystal γ‐Al(OH)3 (Gibbsite) nanoplatelets with average thickness <20 nm and length <800 nm, pretreated with trimethylaluminum (TMA), represent highly efficient activators and supports bis(imino)pyridine iron (II) (FeBIP) complex to produce high density polyethylene (HDPE) as well as gibbsite/HDPE nanocomposites in exceptionally high yields. Opposite to both methylaluminoxane (MAO)‐activated homogeneous FeBIP catalyst and heterogenous silica‐supported single site catalysts, no addition of MAO is required. At low TMA/Fe = 50 molar ratio, the superior catalyst activity (up to 6500 kg mol−1 h−1 bar−1) of FeBIP@TMA@Gibbsite is paralleled by controlled polyethylene particle growth without encountering reactor‐fouling problems typical for homogeneous catalysts. TMA@Gibbsite is compared with other AlR3@Gibbsite activators. The Al/Fe molar ratio governs catalyst activity as well as molar mass, molar mass distribution, and thermal properties of polyethylene. Moreover, hexagonal gibbsite nanoplatelets are uniformly dispersed in polyethylene to yield agglomerate‐free polyethylene/gibbsite nanocomposites.
- Subjects
GIBBSITE; ETHYLENE crystals; HIGH density polyethylene; SINGLE crystals; CATALYSTS; POLYETHYLENE
- Publication
Macromolecular Rapid Communications, 2019, Vol 40, Issue 11, pN.PAG
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201900015