학술논문
Titanium(iv) complexes with OOO2− -type ligands as catalysts for the synthesis of ultra-high-molecular-weight polyethylene.
Document Type
Article
Author
Source
Subject
*ULTRAHIGH molecular weight polyethylene
*CATALYST synthesis
*POLYMERS
*POLYETHYLENE
*TITANIUM
*YOUNG'S modulus
*LIGANDS (Chemistry)
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Language
ISSN
1066-5285
Abstract
A new fluorine-containing OOO2−-type chelating ligand and the titanium(iv) dichloride and bis-isopropoxide complexes with this ligand were synthesized. The structure of the titanium(iv) bis-isopropoxide complex was determined by single-crystal X-ray diffraction analysis. In the presence of Al/Mg activators (Et2AlCl-Bu2Mg or Et3Al2Cl3-Bu2Mg), both complexes catalyze the ethylene polymerization giving ultra-high-molecular-weight polyethylene with a molecular weight of up to 5.8 • 106 Da. Due to a low degree of polymer entanglement, these polymers can be processed by a solvent-free method to prepare high-strength high-modulus films with a Young's modulus up to 117 GPa and a tensile strength up to 2.18 GPa. [ABSTRACT FROM AUTHOR]