Temperature effect on propylene polymerization behavior over Ziegler-Natta catalyst with different cocatalyst systems
| Autor: | Piyasan Praserthdam, Thanyaporn Pongchan, Bunjerd Jongsomjit |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Morphology (linguistics) Polymers and Plastics Metals and Alloys Polymer Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis law.invention Biomaterials Crystallinity Chemical engineering chemistry Polymerization Oxidation state law Ziegler–Natta catalyst Electron paramagnetic resonance |
| Zdroj: | Materials Research Express. 7:025309 |
| ISSN: | 2053-1591 |
| Popis: | This study focused on the effect of temperature in propylene polymerization behaviors up on different cocatalysts employed. It revealed that triethylaluminum (TEA) exhibited higher activity than tri-n-octylaluminum (TnOA) with the optimal temperature of 60 °C, whereas the over reduction of catalyst occurred at 70 °C. However, at low temperature (ca. 50 °C), the mixed cocatalysts (TEA + TnOA) gave the highest activity among the sole cocatalyst. This can be attributed to the occurrence and stabilization of proper Ti oxidation state (Ti3+) form as proven by the electron spin resonance (ESR) with the combination of cocatalysts. In addition, temperatures and types of cocatalyst did not have significant effects on morphology and crystallinity of polymer. |
| Databáze: | OpenAIRE |
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