Metallocene polyethylene wax synthesis
Solid polymethylaluminoxane (sMAO) supported ansa-bridged permethylindenyl zirconocenes Me2SB(CpR,I*)ZrX2 ({(η5-C9Me6)Me2Si(η5-C5H3R)}ZrX2; R = H, Me, and nBu; X = Cl, Br, Me, and CH2Ph) have been investigated as catalysts for the slurry-phase polymerization of ethylene in the pr...
| Main Authors: | , , , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
American Chemical Society
2020
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| _version_ | 1826278618091749376 |
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| author | Lamb, JV Buffet, J-C Turner, ZR Khamnaen, T O'Hare, D |
| author_facet | Lamb, JV Buffet, J-C Turner, ZR Khamnaen, T O'Hare, D |
| author_sort | Lamb, JV |
| collection | OXFORD |
| description | Solid polymethylaluminoxane (sMAO) supported ansa-bridged permethylindenyl zirconocenes Me2SB(CpR,I*)ZrX2 ({(η5-C9Me6)Me2Si(η5-C5H3R)}ZrX2; R = H, Me, and nBu; X = Cl, Br, Me, and CH2Ph) have been investigated as catalysts for the slurry-phase polymerization of ethylene in the presence of H2. The catalysts demonstrated remarkable stability to H2 both in a high-throughput screening system and in a 2 L batch reactor, with an almost constant ethylene uptake maintained throughout the polymerization runs. The catalysts demonstrated very high ethylene polymerization activities, almost 3 times higher than sMAO-(CpnBu)2ZrCl2 (industrial standard zirconocene catalyst) under the same conditions. The presence of small quantities of H2 (<1%) led to significant decreases in polymer molecular weights to produce commercially desirable polyethylene waxes (Mn < 10 kg mol-1) in a batch reactor. |
| first_indexed | 2024-03-06T23:46:37Z |
| format | Journal article |
| id | oxford-uuid:712408d3-d33e-4b42-bb5d-e80f123bcf46 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:46:37Z |
| publishDate | 2020 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:712408d3-d33e-4b42-bb5d-e80f123bcf462022-03-26T19:41:42ZMetallocene polyethylene wax synthesisJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:712408d3-d33e-4b42-bb5d-e80f123bcf46EnglishSymplectic ElementsAmerican Chemical Society2020Lamb, JVBuffet, J-CTurner, ZRKhamnaen, TO'Hare, DSolid polymethylaluminoxane (sMAO) supported ansa-bridged permethylindenyl zirconocenes Me2SB(CpR,I*)ZrX2 ({(η5-C9Me6)Me2Si(η5-C5H3R)}ZrX2; R = H, Me, and nBu; X = Cl, Br, Me, and CH2Ph) have been investigated as catalysts for the slurry-phase polymerization of ethylene in the presence of H2. The catalysts demonstrated remarkable stability to H2 both in a high-throughput screening system and in a 2 L batch reactor, with an almost constant ethylene uptake maintained throughout the polymerization runs. The catalysts demonstrated very high ethylene polymerization activities, almost 3 times higher than sMAO-(CpnBu)2ZrCl2 (industrial standard zirconocene catalyst) under the same conditions. The presence of small quantities of H2 (<1%) led to significant decreases in polymer molecular weights to produce commercially desirable polyethylene waxes (Mn < 10 kg mol-1) in a batch reactor. |
| spellingShingle | Lamb, JV Buffet, J-C Turner, ZR Khamnaen, T O'Hare, D Metallocene polyethylene wax synthesis |
| title | Metallocene polyethylene wax synthesis |
| title_full | Metallocene polyethylene wax synthesis |
| title_fullStr | Metallocene polyethylene wax synthesis |
| title_full_unstemmed | Metallocene polyethylene wax synthesis |
| title_short | Metallocene polyethylene wax synthesis |
| title_sort | metallocene polyethylene wax synthesis |
| work_keys_str_mv | AT lambjv metallocenepolyethylenewaxsynthesis AT buffetjc metallocenepolyethylenewaxsynthesis AT turnerzr metallocenepolyethylenewaxsynthesis AT khamnaent metallocenepolyethylenewaxsynthesis AT ohared metallocenepolyethylenewaxsynthesis |