Olefin polymerisation using titanium phosphinimide catalysts.
Date of Award
Chemistry and Biochemistry
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Homopolymers of 1-hexene, random copolymers of 1-hexene and 1,5-hexadiene, and block copolymers of ethylene and 1-hexene have been prepared at sub-ambient temperatures using Cp(tBu3PN)TiMe2 ( 34) and studied. In addition, the polymerisation of 1-hexene by ( 34) has been investigated for its potential as a living polymerisation system. Analysis of the poly(1-hexene) produced by (34) via 13C NMR spectroscopy reveals that the polymer contains an unusually high degree of 2,1 enchainments, with approximately one in five insertions being reversed relative to the previous one. This suggests that the coordination sphere in (34) is more open than in metallocene catalysts. However, despite the increased openness and ability to insert alpha-olefins in a 2,1 fashion, the internal olefins cyclopentene and cis -2-pentene could not be polymerised to an appreciable extent using (34). A series of copolymers of 1-hexene and 1,5-hexadiene were prepared using (34), with varying amounts of 1,5-hexadiene in the monomer feedstock. (Abstract shortened by UMI.)Dept. of Chemistry and Biochemistry. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2003 .C57. Source: Masters Abstracts International, Volume: 44-01, page: 0362. Thesis (M.Sc.)--University of Windsor (Canada), 2003.
Clemens, Steven N., "Olefin polymerisation using titanium phosphinimide catalysts." (2003). Electronic Theses and Dissertations. 2911.