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 16 of 16 for “"Cocatalyst"”.
-
Block Copolymer Formation by Transformation Reactions
… possibly catalyst) concentrations. Also, as the cocatalyst concentration increases, the initial rate of polymerisation appears to increase accordingly but, after a few minutes, the reactions performed at high cocatalyst concentrations fall and the rate of polymerisation appears to show a maximum …
-
Biphasic, Homogeneous, and Heterogeneous Hydrocarbon Conversion Reactions with Novel Aluminum Chloride Based Catalyst Systems
… aim of this thesis was the development of novel cocatalysts for nickel catalyzed olefin dimerization and oligomerization reactions. For this purpose, cheap and air stable Lewis acidic chloroaluminate ionic liquids were the starting point for our investigations. Chloroaluminate melts are …
-
Studies in the anionic polymerization of methyl methacrylate
… initiators and using aluminium triisobutyl as a cocatalyst. The aspects of the polymerization that were examined were the effect of changing the order of addition of reagents, the temperature at which polymerization takes place and the polarity of the solvent. Trends were assessed in terms of …
-
Die metatesepolimerisasie van alkyne
… of molybdenehexacarbonyl and different phenolic cocatalysts via catalytic polymerization. The reaction was monitored using a gaschromatographic method. The structural and morphological entities of polyphenylacetylene as well as the role of the different cocatalysts on the proposed metal carbene …
-
Poly(β-Gal-Thr): A New Scalable Synthetic Mucin
… lithium hexamethyldisilazide (LiHMDS) and the cocatalyst 1,3-bis(2-hydroxyhexafluoroisopropyl) benzene (HFAB) in the nonpolar solvent CH<sub>2</sub>Cl<sub>2</sub>. A detailed analysis of this polymerization revealed that two propagation reactions proceed simultaneously, although at …
-
Incorporation of Polar Comonomers Into High Density Polyethylene With a Cyclopentadienyl-Amido Titanium Catalyst
… Ti[(C5Me4)SiMe2(tBuN)]Cl2 (1) with MAO as a cocatalyst for ethylene homopolymerization and copolymerizations with 1-TMSO-alkenes to produce a copolymer with polar functionality. Three 1-alkenols of varying length were purchased and derivatized and used for the copolymerization experiments: …
-
Synthesis and Characterization of Cyclopentadienyl Transition Metal Complexes Bearing Tetrafluoropyridyl Substituents
… (1 atm of C2H4, toluene solvent, methylalumoxane cocatalyst).
-
Metathetic Polymerisation of Cyclic Alkenes
… that oxygen could only have a very effective cocatalyst activity if the system was heterogeneous where the source of activity before the addition of oxygen could remain dormant and the active centres produced on the addition of oxygen to the system insoluble. Polymerisation of n-butyl vinyl …
-
Polymerization of olefins and functionalized monomers with zirconocene catalysts
… olefin polymerization, i.e. the high excess of cocatalyst necessary in order to generate a catalytically active system. The addition of polar cosolvents to the reaction mixtures is shown to have a deleterious effect with respect to polymerization. The experimental data is interpreted in terms of …
-
Complexing Carbon Nanomaterials and Reactive Metal Species for Selective Chemical Sensing and Tunable Catalysis
… system comprising a copper complex and TEMPO cocatalyst, enabling the sensitive, selective, and robust detection of trace ethanol in air. In Chapter 8, we report the synthesis of carbon-nanomaterial-based metal chelates that enable effective electronic coupling to electrocatalytic transition …
-
Synthesis of Mononuclear Transition Metal Complexes and their Applications as Catalysts for Ethylene Polymerization
… from different kinds of interactions with the cocatalyst MAO.
-
Aminopyridinato-Ligand-Stabilized Lanthanoid Complexes: Synthesis, Reactivity, Ethylene and Isoprene Polymerization
… choice of the polymerization conditions (cocatalyst, polymerization temperature). The aminopyridinate-stabilized diamide of scandium can polymerize isoprene in the presence of anilinium borate and trialkylaluminium compounds, to obtain a polymer with a high cis-1,4-content. The dialkyl …
-
The Use of Functionalized Zirconocenes as Precursors to Silica-Supported Zirconocene Olefin Polymerization Catalysts
… ethylene polymerization (toluene solution, MAO cocatalyst, Al:Zr = 5000, 50 ï °C) similar to Cp2ZrCl2. Supported metallocene olefin polymerization catalysts were prepared by combining a functionalized metallocene precursor (Cp2ZrBr2 bearing either BrMe2Si or Br2MeSi groups) and partially …
-
Nanocomposites: Incorporation of Cellulose Nanocrystals into Polymers and Addition of Zwitterionic Functionality
… samples, introduction of solvent, organoaluminum cocatalyst, and monomer (ethylene alone or ethylene plus 1-hexene) afforded high density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) samples, respectively, containing well-dispersed CNCs as filler materials. Chapter 2 provided …
-
Mechanism and application of Lewis and Brønsted acid effects in organotransition metal catalysis
… is elaborated using metal triflates as cocatalysts, and Lewis acid acceleration is observed for a variety of different N-nucleophiles. Qualitative mechanistic study implicates the role of halide anions in inhibiting this catalytic reaction, and it is proposed that metal triflates are …