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The exceptional magnetic inequivalence in helical form i of poly-1-pentene

AuthorsPérez, Ernesto ; García-Peñas, A. ; Arranz-Andrés, Javier ; Gómez-Elvira, Javier ; Gómez-Elvira González, José Manuel ; Cerrada, María L.
KeywordsSolid-state NMR
Helical isotactic poly-1-pentene
Magnetic inequivalence
Issue Date2016
CitationPolymer 92: 164-169 (2016)
AbstractA sample of isotactic poly-1-pentene has been synthesized by using a metallocene catalyst, and two specimens have been prepared displaying the most stable Form I of this polymer, reported to adopt a 3 helical conformation. The solid-state CNMR study of this helical form shows an exceptional splitting of the resonances, indicative of an important magnetic inequivalence in the unit cell. The maximum separation (amounting to 4.7 ppm) is obtained for carbon 2B: the methylene next to the terminal methyl in the lateral branch. This exceptional splitting is interpreted as originating from either intermolecular (packing) or intramolecular (conformational) differences (or both), leading to well non-equivalent sites for all the carbons. The comparative analysis of the relaxation times in the rotating frame between isotactic poly-1-pentene and isotactic polypropylene indicates that the two polymers display a rather similar relaxation behavior for both the crystalline and amorphous components.
Publisher version (URL)http://dx.doi.org/10.1016/j.polymer.2016.03.072
Identifiersdoi: 10.1016/j.polymer.2016.03.072
issn: 0032-3861
Appears in Collections:(ICTP) Artículos
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