AM2Net Advanced Macromolecular Materials By Transition Metal Catalysis; Group 2: "Post Metallocene Catalysis"; Functional Polyolefin Architectures via Post-Metallocene Catalysis
Zusammenfassung der Projektergebnisse
Polyolefins are prepared on a large scale by insertion polymerization of ethylene and propylene. The underlying fundamental reactions, which usually occur simultaneously during these polymerizations are the initiation of new chains, the growth of these chains to polyolefin macromolecules by enchainment of monomer building units, and termination of chains. Seperating and controlling these underyling reactions is a prerequisite to generate polymer chains of precisely defined length, or composed of blocks of different monomers along the chain in a predetermined fashion. In this research project, a novel titanium catalyst was discovered which allows for an unprecedented control in such polymerizations. All chains initiate immediately, and chain growth of ethylene proceeds virtually without any chain termination to yield polymer chains of extremely uniform length (Mw/Mn 1.01). This living character of polymerization is retained even at an elevated temperature of 75 °C, typical of commercial processes.
Projektbezogene Publikationen (Auswahl)
- Extremely Narrow-Dispersed High Molecular Weight Polyethylene from Living Polymerization at Elevated Temperatures with o-F Substituted Ti Enolatoimines. J. Am. Chem. Soc. 2008, 130, 13204 - 13205
S.-M. Yu, S. Mecking
- Zirconium Enolatoimine Complexes in Olefin Polymerization. Dalton Trans. 2010, 39, 4612 - 4618
S.-M. Yu, U. Tritschler, I. Göttker-Schnetmann, S. Mecking
