Coordination copolymerization monitoring of ethylene and alfa-olefins by in-line Raman spectroscopy.

Autor:	Comparán-Padilla VE; Departamento de Química Macromolecular y Nanomateriales, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., García-Zamora M; Departamento de Química Macromolecular y Nanomateriales, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., Infante-Martínez R; Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., Díaz JA; Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., Villarreal-Cárdenas L; Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., Rodríguez-Hernández MT; Laboratorio Central, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico., Pérez-Camacho O; Departamento de Química Macromolecular y Nanomateriales, Centro de Investigación en Química Aplicada (CIQA) Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos Saltillo 25294 Coahuila Mexico.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2022 Oct 10; Vol. 12 (44), pp. 28712-28719. Date of Electronic Publication: 2022 Oct 10 (Print Publication: 2022).
DOI:	10.1039/d2ra05213j
Abstrakt:	Copolymerizations of ethylene and alfa-olefins, using Ziegler-Natta or metallocene catalysts, testing two methods of co-monomer addition, through batch or dossing mode during the reactions, are reported in this work. Copolymerizations are monitored by in line Raman spectroscopy, comparing the effect of the kind of catalyst and the co-monomer addition modes on the chemical composition of the copolymers produced. The global co-monomer composition is determined by 13 C NMR spectroscopy, compared with the monitoring by Raman spectroscopy along the reactions, where it is possible to define homogeneous or heterogeneous co-monomer distributions. Batch addition achieves higher incorporations of co-monomers, compared to dosed addition, where it is possible to determine the maximal co-monomer addition without affecting activities by transfer reactions. The incorporation mode of alfa-olefins in this type of reaction has been little reported, and until it is known, there is no rapid technique available to determine the uniformity of the co-monomer incorporations in real time. Copolymerization kinetics are also reported here and correlated to the addition method of the comonomers in both kinds of reactions. Homogeneous and heterogeneous co-monomer incorporations promoted by a single site catalyst (metallocene) or multisite system (Ziegler-Natta) is related to the homogeneous or heterogeneous co-monomer distributions detected by Raman spectroscopy, using each kind of catalytic system. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu