FI Catalysts for Highly Controlled Living Polymerization of Ethylene and Propylene: Creation of Precisely Controlled Polymers

摘要

The unique catalytic behavior of Ti complexes with fluorine-containing phenoxy-imine chelate ligands, fluorinated Ti-FI Catalysts, has been discussed. Fluorinated Ti-FI Catalysts with MAO activation initiate highly-controlled living polymerization of propylene as well s ethylene above room temperature and create a variety of precisely-controlled polymers previously unaccessible using Ziegler-Natta catalysts, such as high molecular weight monodisperse polyethylenes (M_n > 400,000), highly syndiotactic monodisperse polypropylenes with remarkably high T_m~S (T_m 156 °C), and block copolymers comprised of crystalline and amorphous segments, with high efficiency.