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pdf:docinfo:title: Effect of Dendritic Side Groups on the Mobility of Modified Poly(epichlorohydrin) Copolymers
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Keywords: broadband dielectric spectroscopy; dielectric relaxation spectra; macromolecular cooperativity; segmental dynamics; dendronized liquid crystal membranes; poly(epichlorohydrin); CP-MAS NMR; XRD; DSC
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subject: 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 , 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 (Tg). Only after that, clearing transition (Clear) 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.
dc:creator: R. Teruel-Juanes, B. Pascual-Jose, R. Graf, J. A. Reina, M. Giamberini and A. Ribes-Greus
dcterms:created: 2021-06-17T00:54:04Z
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title: Effect of Dendritic Side Groups on the Mobility of Modified Poly(epichlorohydrin) Copolymers
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pdf:docinfo:keywords: broadband dielectric spectroscopy; dielectric relaxation spectra; macromolecular cooperativity; segmental dynamics; dendronized liquid crystal membranes; poly(epichlorohydrin); CP-MAS NMR; XRD; DSC
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dc:title: Effect of Dendritic Side Groups on the Mobility of Modified Poly(epichlorohydrin) Copolymers
modified: 2021-06-17T00:59:31Z
cp:subject: 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 , 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 (Tg). Only after that, clearing transition (Clear) 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.
pdf:docinfo:subject: 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 , 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 (Tg). Only after that, clearing transition (Clear) 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.
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pdf:docinfo:creator: R. Teruel-Juanes, B. Pascual-Jose, R. Graf, J. A. Reina, M. Giamberini and A. Ribes-Greus
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creator: R. Teruel-Juanes, B. Pascual-Jose, R. Graf, J. A. Reina, M. Giamberini and A. Ribes-Greus
meta:author: R. Teruel-Juanes, B. Pascual-Jose, R. Graf, J. A. Reina, M. Giamberini and A. Ribes-Greus
dc:subject: broadband dielectric spectroscopy; dielectric relaxation spectra; macromolecular cooperativity; segmental dynamics; dendronized liquid crystal membranes; poly(epichlorohydrin); CP-MAS NMR; XRD; DSC
meta:creation-date: 2021-06-17T00:54:04Z
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meta:keyword: broadband dielectric spectroscopy; dielectric relaxation spectra; macromolecular cooperativity; segmental dynamics; dendronized liquid crystal membranes; poly(epichlorohydrin); CP-MAS NMR; XRD; DSC
Author: R. Teruel-Juanes, B. Pascual-Jose, R. Graf, J. A. Reina, M. Giamberini and A. Ribes-Greus
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