Activation and Polymerisation ofansa-Zirconocene Chloroamido Complexes
| Autor: | Petri Lehmus, Barbro Löfgren, Nora I. Mäkelä-Vaarne, Udo M. Stehling, Tanja Seraidaris |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Polymers and Plastics
Chemistry Organic Chemistry Cationic polymerization Alkylation Condensed Matter Physics Propene chemistry.chemical_compound Stereospecificity Ultraviolet visible spectroscopy Polymerization Polymer chemistry Materials Chemistry Reactivity (chemistry) Physical and Theoretical Chemistry Metallocene |
| Zdroj: | Macromolecular Chemistry and Physics. 205:1064-1069 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/macp.200300181 |
| Popis: | Propene polymerisation was conducted with three ansa-zirconocene complexed: Me 2 Si(2-Me-4-PhInd) 2 -Zrcl 2 (A), Me 2 Si(2-Me-4-PhInd) 2 ZrClNMe 2 (B) and Me 2 Si-(2-Me-4-PhInd) 2 ZrClNEt 2 (C). Methylalumoxane (MAO) or [HNPhMe 2 ][B(C 6 F 5 ) 4 ] was used as cocatalyst. The influence of cocatalysts and triisobutylaluminum (TIBA) on polymerisation activity, molecular weight and polymer microstructure was studied. Futhermore, the alkylation and activation of the complexes were axamined using UV/VIS measurements, all complexes have low reactivity towards TMA and TIBA. Similar cationic species were formed of all three studied zirconocenes in the reaction with MAO. Additional TIBA did not affect the type of active species formed in the reaction of zirconocene and MAO, but increased the activity of B and C. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text