Synthesis of copolymers of ethylene with 1-alkenes and 1,4-hexadiene using metallocene catalysts

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Pecak, Mark
thesis / dissertation description
Metallocene catalysts have been increasingly studied by industry and academic groups, and are starting to be applied commercially to produce a variety, among which are ethylene/ 1-alkene copolymers. This study was primarily concerned with ethylene/1 - alkene copolymerizations using dimethylsilyl-bis(2-methyl-4-phenyl-indenyl)zirconium dichloride with methylaluminoxane as cocatalyst. The effect of the 4-phenyl group was shown to greatly increase the polymerization activity of ethylene as well as the copolymerization of ethylene and 1 - hexene copolymers. The reactivity ratios, used to calculate the necessary feed ratios needed to create a copolymer with specific characteristics were also determined. The molecular weights, melting points, and glass transitions of the resulting polymers were examined. The activities of copolymerizations of ethylene and 1 ,4-hexadiene were found to have a diminished activity compared to copolymerizations of ethylene and 1 -hexene.