Ethylene Polymerization by Phenoxy Substituted Tris(pyrazolyl)borate Ti(IV) Methyl Complexes
| العنوان: | Ethylene Polymerization by Phenoxy Substituted Tris(pyrazolyl)borate Ti(IV) Methyl Complexes |
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| المؤلفون: | Shinya Hasumi, Koji Itagaki, Kotohiro Nomura, Shu Zhang |
| المصدر: | Macromolecules. 44:773-777 |
| بيانات النشر: | American Chemical Society (ACS), 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Tris, chemistry.chemical_classification, Ethylene, Polymers and Plastics, Organic Chemistry, Cationic polymerization, chemistry.chemical_element, Chain transfer, Polymer, Medicinal chemistry, Catalysis, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Ethylene polymerization, Materials Chemistry, Organic chemistry, Boron |
| الوصف: | Ethylene polymerization using Tp*TiMe2(OAr) [Tp* = HB(3,5-Me2-pyrazolyl)3; Ar = O-2,6-Me2C6H3 (2a), O-2,6-iPr2C6H3 (2b)]-cocatalyst systems [cocatalyst: MAO, [Ph3C][B(C6F5)4], or B(C6F5)3 and AliBu3 or Al(n-octyl)3] or[Tp*TiMe(O-2,6-Me2C6H3)]+[MeB(C6F5)3]−·2THF (3a) in the presence of Al alkyls have been explored. The catalytic activity by 2a,b−cocatalyst systems was highly affected by the Al/Ti molar ratios. Ethylene polymerizations by 2a,b−MAO catalyst systems proceeded in a quasi living manner between −30 and 25 °C, whereas certain degree of chain transfer was observed when the polymerizations by 2a,b were conducted in the presence of borate cocatalysts. The activity by the cationic Ti(IV)−methyl complex (3a) in the presence of Al(n-octyl)3 was close to those by 2a−B(C6F5)3−Al(n-octyl)3, AliBu3 catalyst systems and the Mn values in the resultant polymers were close with uniform distributions; the facts clearly indicate that the same catalytically active species play a role in this catalysis. |
| تدمد: | 1520-5835 0024-9297 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::d592a18ff9ec296fbf449fba272c3f09 https://doi.org/10.1021/ma102233w |
| رقم الأكسشن: | edsair.doi...........d592a18ff9ec296fbf449fba272c3f09 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205835 00249297 |
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