Kinetic Features of Hexene-1 Polymerization over Supported Titanium-Magnesium Catalyst
| Autor: | Ludmila G. Echevskaya, Marina I. Nikolaeva, Mikhail A. Matsko, Sergei Andreevich Sergeev, Vladimir Alexandrovich Zakharov |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Kinetic chain length
Polymers and Plastics General Chemical Engineering Inorganic chemistry technology industry and agriculture Solution polymerization Chain transfer General Chemistry Photochemistry humanities chemistry.chemical_compound Chain-growth polymerization chemistry Polymerization Hexene Living polymerization Coordination polymerization human activities |
| Zdroj: | Macromolecular Reaction Engineering. 8:666-672 |
| ISSN: | 1862-832X |
| DOI: | 10.1002/mren.201400009 |
| Popis: | The data on the effect of cocatalyst composition and polymerization conditions on activity and MWD of polyhexene (PH) produced over a high-activity titanium-magnesium catalyst are obtained. The cocatalyst has an extremely strong effect on the MWD of polyhexene. When triisobutylaluminum is used as a cocatalyst, PH with high Mw and narrow MWD is produced. The use of TEA decreases the Mw of PH and broadens the MWD. It is found the ratio between the rate constant of chain transfer to TEA (ktrAl) and the propagation rate constant (kp) is two orders of magnitude higher than the ktrAl/kp value calculated for polymerization of ethylene and propylene. We attributed this effect to formation of polyhexene in the solution, as opposed to polymerization of ethylene and propylene in slurry polymerization. The addition of hydrogen at polymerization of hexene-1 significantly increases activity and stereospecificity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text