Coupling of Caged Molecule Dynamics to JG β-Relaxation II: Polymers

Autor: Li-Min Wang, S. Capaccioli, K. L. Ngai, D. Prevosto

Publikováno v: The Journal of Physical Chemistry B. 119:12502-12518

At temperatures below the nominal glass transition temperature Tgα, the structural α-relaxation and the Johari-Goldstein (JG) β-relaxation are too slow to contribute to susceptibility measured at frequencies higher than 1 GHz. This is particularly

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ac8ddebcc97148e1180a0d9ce5e2684
https://doi.org/10.1021/acs.jpcb.5b07293

Sub-Rouse modes in polymer thin films: Coupling to density and responding to physical aging

Autor: Simone Capaccioli, D. Prevosto, K. L. Ngai

The presence of sub-Rouse modes in bulk polymers with length scale and relaxation times in between the segmental α-relaxation and the Rouse modes had long been justified by theoretical consideration, and found in many experimental studies. The sub-R

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1b629574dbbd9f4228cebc8e040aa7a
http://hdl.handle.net/11568/843761

Does the entropy and volume dependence of the structural α-relaxation originate from the Johari–Goldstein β-relaxation?

Autor: Mauro Lucchesi, D. Prevosto, K. L. Ngai, Pierangelo Rolla, S. Capaccioli

Publikováno v: Journal of non-crystalline solids 355 (2009): 705–711.
info:cnr-pdr/source/autori:Prevosto, D.; Capaccioli, S.; Lucchesi, M.; Rolla, P.A.; Ngai, K.L./titolo:Does the entropy and volume dependence of the structural alpha-relaxation originate from the Johari–Goldstein beta-relaxation?/doi:/rivista:Journal of non-crystalline solids/anno:2009/pagina_da:705/pagina_a:711/intervallo_pagine:705–711/volume:355

Conventional theories of glass transition are focussed on reproducing the thermodynamic and dynamic properties of the structural α-process. However, in the last decade a class of secondary relaxations, called the Johari–Goldstein (JG) β-relaxatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2002be1298efeef0f5cd53c797650ac2
https://doi.org/10.1016/j.jnoncrysol.2008.09.043

Revealing the rich dynamics of glass-forming systems by modification of composition and change of thermodynamic conditions

Autor: M. Shahin Thayyil, K. L. Ngai, Simone Capaccioli, D. Prevosto

Secondary relaxations have been classified into two types, depending on whether they are related to the structural α-relaxation in properties or not. Those secondary relaxations that are related to the α-relaxation may have fundamental importance,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::764d3a485983e84ce5f74ed0e3197acc
http://hdl.handle.net/11568/766995

Effect of Interface Interaction on the Segmental Dynamics of Poly(vinylacetate) Investigated by Local Dielectric Spectroscopy

Autor: D. Prevosto, C. M. Roland, M. Labardi, Riccardo Casalini

Publikováno v: ACS macro letters 4 (2015): 1022–1026. doi:10.1021/acsmacrolett.5b00488
info:cnr-pdr/source/autori:Casalini, R.; Prevosto, D.; Labardi, M.; Roland, C.M./titolo:Effect of Interface Interaction on the Segmental Dynamics of Poly(vinylacetate) Investigated by Local Dielectric Spectroscopy/doi:10.1021%2Facsmacrolett.5b00488/rivista:ACS macro letters/anno:2015/pagina_da:1022/pagina_a:1026/intervallo_pagine:1022–1026/volume:4

The segmental dynamics of poly(vinyl acetate) (PVAc) thin films were measured in the presence of an aluminum interface and in contact with an incompatible polymer, poly(4-vinylpyridine). The local dielectric relaxation was found to be faster in thin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2e1deb3d1be4bf26e22297859fef4d2
http://www.cnr.it/prodotto/i/337619