Kinetic Studies of Chain-Transfer Reactions in Polymerization of Hexene-1 over Highly Active Supported Titanium-Magnesium Catalysts
| Autor: | L. G. Echevskaya, M. A. Matsko, V. A. Zakharov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Hydrogen Molecular mass chemistry.chemical_element Chain transfer 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Monomer Reaction rate constant chemistry Polymerization Physical chemistry 0210 nano-technology |
| Zdroj: | Kataliz v promyshlennosti. 19:104-113 |
| ISSN: | 2413-6476 1816-0387 |
| DOI: | 10.18412/1816-0387-2019-2-104-113 |
| Popis: | The influence of concentrations of the monomer, triethylaluminum, and hydrogen on the molecular mass of polyhexene obtained by polymerization of hexene-1 over a supported titanium-magnesium catalyst was studied. Ratios of rate constants of the transfer of polymer chain with the monomer, triethylaluminum (AlEt3) and hydrogen to the rate constant of the chain-growth were calculated.The data obtained allowed the contribution of individual reactions of chain transfer to molecular mass of the polymer to be estimated at various polymerization conditions and the polymerization conditions to be chosen deliberately in order to synthesize polyhexene with the required molecular mass. The discovered inhomogeneity of the centers active to the chain transfer with hydrogen in the presence of the AlEt3 co-catalyst caused changes in the polymer polydispersion upon changes in the hydrogen concentration in the reaction medium. Curves of the polyhexene molecular mass distribution in polyhexene samples with different polydispersion were analyzed using their resolution into Flory components. |
| Databáze: | OpenAIRE |
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