Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"Methylaluminoxane"”.
-
Studies on Methylaluminoxane Catalyst Activators
… devoted to the structural characterization of methylaluminoxane (MAO). Initially the work focused upon MAO formation by studying the hydrolysis reaction of trimethylaluminium (TMA), with a greater interest in the initial reaction steps of TMA with H2O. This was attempted by using 1H VT NMR …
-
The application of novel multinuclear catalysts derived from dendrimeric ligands in the polymerization and oligomerization of unsaturated hydrocarbons
… aluminium alkyls such as EtAlCl2 and modified methylaluminoxane (MMAO) as activators. All the dendrimeric catalysts evaluated are active in the oligomerization reactions. From the oligomerization results it was observed that there is a clear dendritic effect, in that both catalyst activity as …
-
The Versatility of Aluminum Systems: Ligand Transfer Agents and Polymerization Catalysts
… with LCu(II) catalysts in the presence of methylaluminoxane (MAO), ligand (L) transfer is observed from the copper centre to the aluminum centre present in MAO. In the α-diimine case, an (imino-amido)AlMe2 complex is formed by α-diimine ligand transfer to aluminum followed by alkylation of …
-
Group 4 metal and vanadium bis(phenolato) complexes : synthesis, structure and olefin polymerisation activity
… cis-alpha to cis-beta2. Upon activation with methylaluminoxane, [Ti{OSNO}X2] complexes were moderately active in the polymerization of styrene and gave trace activity in the polymerization of 1-hexene, thus combining the worst polymerisation properties of their parent ligands, rather than the …
-
Probing Organometallic Reactions With 19F NMR
… of the reaction of group 4 metallocenes with methylaluminoxane (MAO) that lead to active Ziegler-Natta olefin polymerization catalysts. A novel experimental approach is described, in which a unique spectroscopic probe (a fluorinated substituent) is attached to the metallocene ancillary ligands …
-
Synthesis of Mononuclear Transition Metal Complexes and their Applications as Catalysts for Ethylene Polymerization
… and vanadium complexes after activation with methylaluminoxane (MAO) were used for the homogeneous polymerization of ethylene. They showed good to moderate catalytic activities towards ethylene polymerization reactions. The vanadium complexes showed the highest activities, followed by titanium …
-
Divalent transition metal centers: the synthesis of new chemical vapor deposition precursors and studies of ethylene polymerization and oligomerization catalysts
… and CpTiX(dmpe)2, when activated with MAO (methylaluminoxane), produce large amounts of a high molecular weight polyethylene, with the largest turnover number being 18,000 for Ti(BH4)2(dmpe)2. Reactions performed in the presence of AlEt3 produce smaller quantities of polyethylene, and in …
-
Polymerization of olefins and functionalized monomers with zirconocene catalysts
The subject of this dissertation is the application of zirconocene catalysis to the polymerization of nonfunctional 1-olefins and functional olefins, such as methacrylates. The polymerization of 1-hexene with zirconocene/MAO catalyst systems is studied in order to elucidate the nature of the active …
-
Investigations into cyclopropanation and ethylene polymerization via salicylaldiminato copper (II) complexes
Two distinct overall research objectives are in this Master’s thesis. Very little relates the two chapters apart from the ligands. The first chapter addresses diastereoselective homogeneous copper catalyzed cyclopropanation reactions. Cyclopropanation of styrene and ethyl diazoacetate (EDA) is a …