Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes
Six new peralkylated bis(indenyl) zirconocene complexes have been synthesised and fully characterised; rac-Me2SB(3-EtI*)ZrX2 and meso-Me2SB(3-EtI*)ZrX2 (X = Cl, Br and CH2Ph). Solution-phase ethylene polymerisation using rac-Me2SB(3-EtI*)ZrCl2/methylaluminoxane (MAO) and slurry-phase ethylene p...
| Κύριοι συγγραφείς: | , , , , |
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| Μορφή: | Journal article |
| Γλώσσα: | English |
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Elsevier
2020
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| _version_ | 1826261531518566400 |
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| author | Angpanitcharoen, P Lamb, JV Turner, ZR Buffet, J-C O'Hare, D |
| author_facet | Angpanitcharoen, P Lamb, JV Turner, ZR Buffet, J-C O'Hare, D |
| author_sort | Angpanitcharoen, P |
| collection | OXFORD |
| description | Six new peralkylated bis(indenyl) zirconocene complexes have been synthesised and fully characterised; rac-Me2SB(3-EtI*)ZrX2 and meso-Me2SB(3-EtI*)ZrX2 (X = Cl, Br and CH2Ph). Solution-phase ethylene polymerisation using rac-Me2SB(3-EtI*)ZrCl2/methylaluminoxane (MAO) and slurry-phase ethylene polymerisation using rac-Me2SB(3-EtI*)ZrCl2 immobilised on solid polymethylaluminoxane (sMAO), MAO modified layered double hydroxide (LDHMAO) and MAO modified silica (SSMAO) were studied. Polymerisation conditions were optimised for sMAO-rac-Me2SB(3-EtI*)ZrCl2 and applied to the other catalysts. A 75:25 mixture of rac- and meso-Me2SB(3-EtI*)Zr(CH2Ph)2 supported on sMAO showed the highest polymerisation activities (4832 kgPEmolZr−1 h−1 bar−1 at 60 °C), producing high density polyethylenes (HDPE) with modest molecular weights (Mw of 336 kg mol−1 at 60 °C) and molecular weight distributions (Mw/Mn) less than 3.2. sMAO-rac-Me2SB(3-EtI*)ZrCl2 was found to be responsive to H2 in a high-throughput screening system, producing polyethylenes with low molecular weights (Mw of 41 kg mol−1 with 1.6% H2). In the same high-throughput system, slurry-phase ethylene polymerisation in the presence of 1-hexene comonomer was shown to increase the polymerisation activity of sMAO-rac-Me2SB(3-EtI*)ZrCl2) compared to polymerisation in the same system without 1-hexene. |
| first_indexed | 2024-03-06T19:22:49Z |
| format | Journal article |
| id | oxford-uuid:1aae0035-7cbd-4c6c-8f7a-f2bb7b65d0b9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:22:49Z |
| publishDate | 2020 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:1aae0035-7cbd-4c6c-8f7a-f2bb7b65d0b92022-03-26T10:56:16ZSynthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1aae0035-7cbd-4c6c-8f7a-f2bb7b65d0b9EnglishSymplectic ElementsElsevier2020Angpanitcharoen, PLamb, JVTurner, ZRBuffet, J-CO'Hare, DSix new peralkylated bis(indenyl) zirconocene complexes have been synthesised and fully characterised; rac-Me2SB(3-EtI*)ZrX2 and meso-Me2SB(3-EtI*)ZrX2 (X = Cl, Br and CH2Ph). Solution-phase ethylene polymerisation using rac-Me2SB(3-EtI*)ZrCl2/methylaluminoxane (MAO) and slurry-phase ethylene polymerisation using rac-Me2SB(3-EtI*)ZrCl2 immobilised on solid polymethylaluminoxane (sMAO), MAO modified layered double hydroxide (LDHMAO) and MAO modified silica (SSMAO) were studied. Polymerisation conditions were optimised for sMAO-rac-Me2SB(3-EtI*)ZrCl2 and applied to the other catalysts. A 75:25 mixture of rac- and meso-Me2SB(3-EtI*)Zr(CH2Ph)2 supported on sMAO showed the highest polymerisation activities (4832 kgPEmolZr−1 h−1 bar−1 at 60 °C), producing high density polyethylenes (HDPE) with modest molecular weights (Mw of 336 kg mol−1 at 60 °C) and molecular weight distributions (Mw/Mn) less than 3.2. sMAO-rac-Me2SB(3-EtI*)ZrCl2 was found to be responsive to H2 in a high-throughput screening system, producing polyethylenes with low molecular weights (Mw of 41 kg mol−1 with 1.6% H2). In the same high-throughput system, slurry-phase ethylene polymerisation in the presence of 1-hexene comonomer was shown to increase the polymerisation activity of sMAO-rac-Me2SB(3-EtI*)ZrCl2) compared to polymerisation in the same system without 1-hexene. |
| spellingShingle | Angpanitcharoen, P Lamb, JV Turner, ZR Buffet, J-C O'Hare, D Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title | Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title_full | Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title_fullStr | Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title_full_unstemmed | Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title_short | Synthesis, characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis(indenyl) zirconocenes |
| title_sort | synthesis characterisation and ethylene polymerisation performance of silyl bridged peralkylated bis indenyl zirconocenes |
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