{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T13:59:39Z","timestamp":1783605579336,"version":"3.55.0"},"reference-count":66,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T00:00:00Z","timestamp":1663545600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Sulfur compounds are removed from propylene through purification processes. However, these processes are not 100% effective, so low concentrations of compounds such as H2S may be present in polymer-grade propylene. This article studies the effects of H2S content on polypropylene polymerization through the controlled dosage of this compound with concentrations between 0.07 and 5 ppm and its monitoring during the process to determine possible reaction mechanisms and evaluate variations in properties of the material by TGA, FTIR, MFI, and XDR analysis. It was found that the fluidity index increases directly proportional to the concentration of H2S. In addition, the thermo-oxidative degradation is explained by means of the proposed reaction mechanisms of the active center of the Ziegler\u2013Natta catalyst with the H2S molecule and the formation of substances with functional groups such as alcohol, ketones, aldehydes, CO, and CO2 by the oxidation of radical complexes. This study shows for the first time a reaction mechanism between the active center formed for polymerization and H2S, in addition to showing how trace impurities in the raw materials can affect the process, highlighting the importance of optimizing the processes of removal and purification of polymer-grade materials.<\/jats:p>","DOI":"10.3390\/polym14183910","type":"journal-article","created":{"date-parts":[[2022,9,20]],"date-time":"2022-09-20T04:28:55Z","timestamp":1663648135000},"page":"3910","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Impact of Traces of Hydrogen Sulfide on the Efficiency of Ziegler\u2013Natta Catalyst on the Final Properties of Polypropylene"],"prefix":"10.3390","volume":"14","author":[{"given":"Joaqu\u00edn","family":"Hern\u00e1ndez-Fern\u00e1ndez","sequence":"first","affiliation":[{"name":"Chemistry Program, Department of Natural and Exact Sciences, San Pablo Campus, University of Cartagena, Cartagena 130015, Bolivar, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2811-5769","authenticated-orcid":false,"given":"Heidi","family":"Cano","sequence":"additional","affiliation":[{"name":"Department of Civil and Environment Engineering, Universidad de la Costa, Calle 58 #55-66, Barranquilla 080002, Atl\u00e1ntico, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3491-6618","authenticated-orcid":false,"given":"Miguel","family":"Aldas","sequence":"additional","affiliation":[{"name":"Departamento de Ciencia de Alimentos y Biotecnolog\u00eda, Facultad de Ingenier\u00eda Qu\u00edmica y Agroindustria, Escuela Polit\u00e9cnica Nacional, Quito 170517, Ecuador"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1016\/j.polymer.2018.10.041","article-title":"Synthesis of Polypropylene Functionalized with a Trace Amount of Reactive Functional Groups and Its Utilization in Graft-Type Nanocomposites","volume":"158","author":"Kurahashi","year":"2018","journal-title":"Polymer"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Karol, F.J., and Jacobson, F.I. 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