Effects of Different Concentrations of Arsine on the Synthesis and Final Properties of Polypropylene
This article studies the effects of arsine on the synthesis and thermal degradation of 4 samples of virgin polypropylene (PP-virgin) and proposes reaction mechanisms that allow understanding of its behaviour. Different points are monitored during the polypropylene synthesis to perform TGA, DSC, FT-I...
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| Veröffentlicht in: | Polymers 2022-07, Vol.14 (15), p.3123 |
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| creator | Hernández-Fernández, Joaquín Guerra, Yoleima Puello-Polo, Esneyder Marquez, Edgar |
| description | This article studies the effects of arsine on the synthesis and thermal degradation of 4 samples of virgin polypropylene (PP-virgin) and proposes reaction mechanisms that allow understanding of its behaviour. Different points are monitored during the polypropylene synthesis to perform TGA, DSC, FT-IR, RDX, and MFI analyses later. The content of AsH3 in polypropylene varies between 0.05 and 4.73 ppm, and of arsenic in virgin PP residues between 0.001 and 4.32 ppm for PP0 and PP10, increasing in fluidity index from 3.0 to 24.51. The origin of thermo-oxidative degradation is explained by the reaction mechanisms of the Molecule AsH3 with the active titanium center of the ZN catalyst and the subsequent oxidation to form radical complexes. OO-AsH-TiCl4-MgCl2 and (OO-as-OO)2 -TiCl4-MgCl2, which, by radical reactions, give rise to the formation of functional groups aldehyde, ketone, alcohol, carboxylic acid, CO, CO2, PP-Polyol, PP-Polyether, and PP-Isopropylethers. These species caused the TG and DTG curves to increase degradation peaks in pp samples. |
| doi_str_mv | 10.3390/polym14153123 |
| format | Article |
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Different points are monitored during the polypropylene synthesis to perform TGA, DSC, FT-IR, RDX, and MFI analyses later. The content of AsH3 in polypropylene varies between 0.05 and 4.73 ppm, and of arsenic in virgin PP residues between 0.001 and 4.32 ppm for PP0 and PP10, increasing in fluidity index from 3.0 to 24.51. The origin of thermo-oxidative degradation is explained by the reaction mechanisms of the Molecule AsH3 with the active titanium center of the ZN catalyst and the subsequent oxidation to form radical complexes. OO-AsH-TiCl4-MgCl2 and (OO-as-OO)2 -TiCl4-MgCl2, which, by radical reactions, give rise to the formation of functional groups aldehyde, ketone, alcohol, carboxylic acid, CO, CO2, PP-Polyol, PP-Polyether, and PP-Isopropylethers. These species caused the TG and DTG curves to increase degradation peaks in pp samples.</description><identifier>ISSN: 2073-4360</identifier><identifier>EISSN: 2073-4360</identifier><identifier>DOI: 10.3390/polym14153123</identifier><identifier>PMID: 35956637</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Aldehydes ; Carboxylic acids ; Fluidized bed reactors ; Functional groups ; Gases ; Hydrogen ; Ketones ; Ligands ; LPG ; Magnesium chloride ; Metals ; Molecular weight ; Nitrogen ; Oxidation ; Polymerization ; Polypropylene ; Reaction mechanisms ; Synthesis ; Thermal degradation ; Thermogravimetric analysis ; Titanium chlorides</subject><ispartof>Polymers, 2022-07, Vol.14 (15), p.3123</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central Open Access; MDPI - Multidisciplinary Digital Publishing Institute; PubMed Central |
| subjects | Aldehydes Carboxylic acids Fluidized bed reactors Functional groups Gases Hydrogen Ketones Ligands LPG Magnesium chloride Metals Molecular weight Nitrogen Oxidation Polymerization Polypropylene Reaction mechanisms Synthesis Thermal degradation Thermogravimetric analysis Titanium chlorides |
| title | Effects of Different Concentrations of Arsine on the Synthesis and Final Properties of Polypropylene |
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