Autor según el artículo: Teruel-Juanes, R; Pascual-Jose, B; Graf, R; Reina, J A; Giamberini, M; Ribes-Greus, A
Departamento: Química Analítica i Química Orgànica Enginyeria Química
e-ISSN: 2073-4360
Autor/es de la URV: Giamberini, Marta / Reina Lozano, José Antonio
Palabras clave: Xrd Segmental dynamics Poly(epichlorohydrin) Macromolecular cooperativity Macromolecular coopera-tivity Dsc Dielectric relaxation spectra Dendronized liquid crystal membranes Crystalline polymeric wires Cp-mas nmr Broadband dielectric spectroscopy xrd viscosity units temperature-dependence state selective proton transport segmental dynamics relaxation processes poly(epichlorohydrin) macromolecular cooperativity ion-conducting membranes family dsc dielectric relaxation spectra design dendronized liquid crystal membranes cp-mas nmr
Resumen: The macromolecular dynamics of dendronized copolymer membranes (PECHs), obtained by chemical modification of poly(epichlorohydrin) with the dendron 3,4,5-tris[4-(n-dodecan-1-yloxy)benzyloxy] benzoate, was investigated. In response to a thermal treatment during membrane preparation, these copolymers show an ability to change their shape, achieve orientation, and slightly crystallize, which was also observed by CP-MAS NMR, XRD, and DSC. The phenomenon was deeply analyzed by dielectric thermal analysis. The dielectric spectra show the influence of several factors such as the number of dendritic side groups, the orientation, their self-assembling dendrons, and the molecular mobility. The dielectric spectra present a sub-Tg dielectric relaxation, labelled as γ, associated with the mobility of the benzyloxy substituent of the dendritic group. This mobility is not related to the percentage of these lateral chains but is somewhat hindered by the orientation of the dendritic groups. Unlike other less complex polymers, the crystallization was dismantled before the appearance of the glass transition (α<sub>Tg</sub>). Only after that, clearing transition (α<sub>Clear</sub>) can be observed. The PECHs were flexible and offered a high free volume, despite presenting a high degree of modifications. However, the molecular mobility is not independent in each phase and the self-assembling dendrons can be eventually fine-tuned according to the percentage of grafted groups.
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
Direcció de correo del autor: marta.giamberini@urv.cat joseantonio.reina@urv.cat
Identificador del autor: 0000-0001-8278-3552 0000-0002-9245-4135
Fecha de alta del registro: 2024-11-02
Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
Enlace a la fuente original: https://www.mdpi.com/2073-4360/13/12/1961
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
Referencia al articulo segun fuente origial: Polymers . 13 (12): 1961-
Referencia de l'ítem segons les normes APA: Teruel-Juanes, R; Pascual-Jose, B; Graf, R; Reina, J A; Giamberini, M; Ribes-Greus, A (2021). Effect of Dendritic Side Groups on the Mobility of Modified Poly(epichlorohydrin) Copolymers. Polymers , 13(12), 1961-. DOI: 10.3390/polym13121961
DOI del artículo: 10.3390/polym13121961
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2021
Tipo de publicación: Journal Publications
Repositori URV