Abstract
The preparation and surface science study of model catalysts for the Ziegler-Natta polymerization are reported. Ultra-thin films of MgCl 2 and TiCl 4 have been prepared by gas phase deposition on polycrystalline Au foil in UHV conditions and are characterized by XPS. Titanium chloride films can be deposited on both MgCl 2 films and clean Au at 300 K in a background TiCl 4 pressure of 1 × 10 −8−5 × 10 −7 Torr, in the presence of an electron beam of 1 keV irradiating the substrate. The deposited titanium chloride consists of a TiCl 2 multilayer film with one monolayer of TiCl 4 chemisorbed at the surface. Upon exposure of AlEt 3, the TiCl 4 monolayer undergoes reduction and alkylation with the formation of TiCl 2Et and TiClEt n species at the film surface. No evidence for TiCl 3 formation is observed. These model systems are active catalysts for the Ziegler-Natta polymerization of both ethylene and propylene.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
