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Supported bis(peralkylindenyl)metallocene catalysts for slurry phase ethylene polymerisation
- Source :
- Polyhedron. 116:216-222
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- A series of bis(peralkylindenyl)zirconocene and hafnocene complexes were synthesised and characterised by NMR spectroscopy, mass spectrometry and elemental analyses. 3-ethyl-2,4,5,6,7-pentamethylindanone, ( 3-Et Ind # [Formula presented] 3-ethyl-2,4,5,6,7-pentamethylindene, ( 3-Et Ind # )H, and rac-3-ethyl-2,4,5,6,7-pentamethylindenylhafnium dichloride, rac-( 3-Et Ind # ) 2 HfCl 2 , were also characterised by X-ray crystallography. rac- and meso-( 3-Et Ind # ) 2 MCl 2 (M = Zr or Hf) were obtained from the reaction of ( 3-Et Ind # )Li with ZrCl 4 or HfCl 4 . The group 4 metallocenes were then reacted with methylaluminoxane-functionalised silica (SSMAO) to afford silica supported catalysts. A mixture of rac- and meso-( 3-Et Ind # ) 2 ZrCl 2 supported on SSMAO demonstrated an initial polymerisation activity of 250 kg PE /mol M /h/bar. At 70 °C, using rac-( 3-Et Ind # ) 2 ZrCl 2 , solution phase polymerisation activities were twenty times faster than slurry phase polymerisation using SSMAO-rac-( 3-Et Ind # ) 2 ZrCl 2 (1243 and 75 kg PE /mol Zr /h/bar respectively).
- Subjects :
- Zirconium
010405 organic chemistry
Chemistry
chemistry.chemical_element
Nuclear magnetic resonance spectroscopy
010402 general chemistry
Mass spectrometry
01 natural sciences
0104 chemical sciences
Catalysis
Inorganic Chemistry
chemistry.chemical_compound
Polymerization
Phase (matter)
Polymer chemistry
Materials Chemistry
Slurry
Physical and Theoretical Chemistry
Metallocene
Subjects
Details
- ISSN :
- 02775387
- Volume :
- 116
- Database :
- OpenAIRE
- Journal :
- Polyhedron
- Accession number :
- edsair.doi.dedup.....35f9df0a2c7403a7fd95a577aa88c7c6