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Title

NMR study of the comonomer effect in metallocene poly(propylene-co-1-pentene) copolymers synthesized at low temperature

AuthorsGarcía-Peñas, A. ; Martínez, Carmen ; Cerrada, María L. ; Pérez, Ernesto ; Gómez-Elvira González, José Manuel
KeywordsPolypropylene copolymers
A-olefins
Polyolefins
NMR
Microstructure
Comonomer effect
Metallocene catalysts
Issue Date2017
PublisherJohn Wiley & Sons
CitationJournal of Polymer Science, Part A: Polymer Chemistry 55: 843-854 (2017)
AbstractThe 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.
Publisher version (URL)http://dx.doi.org/10.1002/pola.28434
URIhttp://hdl.handle.net/10261/150263
DOIhttp://dx.doi.org/10.1002/pola.28434
Identifiersdoi: 10.1002/pola.28434
issn: 0887-624X
e-issn: 1099-0518
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