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Título: | NMR study of the comonomer effect in metallocene poly(propylene-co-1-pentene) copolymers synthesized at low temperature |
Autor: | García-Peñas, A. CSIC ORCID; Martínez, Carmen; Cerrada, María L. CSIC ORCID; Pérez, Ernesto CSIC ORCID; Gómez-Elvira González, José Manuel CSIC ORCID | Palabras clave: | Polypropylene copolymers A-olefins Polyolefins NMR Microstructure Comonomer effect Metallocene catalysts |
Fecha de publicación: | 2017 | Editor: | John Wiley & Sons | Citación: | Journal of Polymer Science, Part A: Polymer Chemistry 55: 843-854 (2017) | Resumen: | The influence of the comonomer in the synthesis of poly(propylene-co−1-pentene) copolymers, with rac-(dimethylsilylbis(1-indenyl))ZrCl/Methylaluminoxane at low temperature, has been studied. Changes in the catalyst activity and molecular weight have been analyzed as a function of copolymer composition, and associated with both content and nature of chain defects. The thorough characterization of chain-end double bonds by means of the H NMR technique highlights the particular chain termination pathway, which underlies the so-called comonomer effect. A specific termination mechanism is proposed based on the preferential regio-irregular interaction of the active site with 1-pentene molecules, instead of the one related to the β-H atom of the last regular inserted unit, either propene or 1-pentene. | Versión del editor: | http://dx.doi.org/10.1002/pola.28434 | URI: | http://hdl.handle.net/10261/150263 | DOI: | 10.1002/pola.28434 | Identificadores: | doi: 10.1002/pola.28434 issn: 0887-624X e-issn: 1099-0518 |
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