A Novel Ziegler–Natta-Type Catalytic System—TiCl 4 /2,2′-Dimethoxy-1,1′-Binaphthalene/Et 3 Al 2 Cl 3 /Bu 2 Mg for Production of Ultrahigh Molecular Weight Polyethylene Nascent Reactor Powders, Suitable for Solvent-Free Processing

摘要

A series of ultrahigh molecular weight polyethylenes with viscosity-average molecular weights in the range of 1.6–5.6 × 10 6 have been prepared by using a novel Ziegler–Natta-type catalytic system—TiCl 4 /2,2′-dimethoxy-1,1′-binaphthalene/Et 3 Al 2 Cl 3 /Bu 2 Mg at different temperatures ( T poly ) in the range between 10 and 70 °C in toluene. The morphology of the nascent reactor powders has been studied by scanning electron microscopy, wide-angle X-ray diffraction, and the DSC melting behavior. Polymers are suitable for the modern processing methods—the solvent-free solid-state formation of super high-strength (tensile strength over 1.8–2.5 GPa) and high-modulus (elastic modulus up to 136 GPa) oriented film tapes. With decrease of T poly , the drawability of the reactor powders increased significantly.