Titanium(III, IV)-Containing Catalytic Systems for Production of Ultrahigh Molecular Weight Polyethylene Nascent Reactor Powders, Suitable for Solventless Processing—Impact of Oxidation States of Transition Metal
| Autor: | Mikhail I. Buzin, Svetlana Ch. Gagieva, Galina G. Nikiforova, Elena S. Mikhaylik, Evgenii K. Golubev, Nikolay A. Kolosov, Olga A. Serenko, Sergey V. Zubkevich, Vladislav A. Tuskaev, Alexander Sizov, Dmitrii A. Kurmaev, Boris M. Bulychev, Viktor G. Vasil'ev |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
coordination compounds
Materials science Polymers and Plastics chemistry.chemical_element 02 engineering and technology mechanical properties 010402 general chemistry 01 natural sciences Article Catalysis Titanium chloride lcsh:QD241-441 chemistry.chemical_compound ultrahigh molecular weight polyethylene Transition metal lcsh:Organic chemistry Oxidation state titanium Ziegler–Natta polymerization Tetrahydrofuran Group 2 organometallic chemistry chemistry.chemical_classification General Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Chemical engineering 0210 nano-technology Titanium |
| Zdroj: | Polymers; Volume 10; Issue 1; Pages: 2 Polymers, Vol 10, Iss 1, p 2 (2017) Polymers |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym10010002 |
| Popis: | Catalytic systems containing TiCl4 or TiCl3, THF, organomagnesium (n-Bu2Mg) and organoaluminum compounds capable of producing ultrahigh molecular weight polyethylene (UHMWPE) were developed. The resulting polymers were characterized by a molecular weight in the range of (1.8–7.8) × 106 Da and desirable morphology, suitable for modern methods of polymer processing—the solvent-free solid-state processing of superhigh-strength (tensile strength up to 2.1 GPa) and high-modulus (elastic modulus up to 125 GPa) oriented films and film tapes. The impacts of a THF additive, the oxidation state of the titanium atom, and the composition and nature of the nontransition organometallic compounds on the formation of catalytic systems for UHMWPE production were evaluated. The results indicate the suitability of individual titanium chloride tetrahydrofuran complex application for the formation of THF-containing catalytic systems. This approach also results in a significant increase in the system catalytic activity and mechanical properties of UHMWPE. The catalysts based on Ti(III) were inferior to systems containing Ti(IV) in productivity but were markedly superior in the mechanical properties of UHMWPE. |
| Databáze: | OpenAIRE |
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