Glassy dynamics of two poly(ethylene glycol) derivatives in the bulk and in nanometric confinement as reflected in its inter- and intra-molecular interactions
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Altres documents de l'autoria: Jasiurkowska-Delaporte, Małgorzata; Kossack, Wilhelm; Kiprop Kipnusu, Wycliffe; Sangoro, Joshua; Iacob, Ciprian; Kremer, Friedrich
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Títol
Glassy dynamics of two poly(ethylene glycol) derivatives in the bulk and in nanometric confinement as reflected in its inter- and intra-molecular interactionsAutoria
Data de publicació
2018-08Editor
AIP PublishingCita bibliogràfica
JASIURKOWSKA-DELAPORTE, Małgorzata, et al. Glassy dynamics of two poly (ethylene glycol) derivatives in the bulk and in nanometric confinement as reflected in its inter-and intra-molecular interactions. The Journal of chemical physics, 2018, 149.6: 064501.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://aip.scitation.org/doi/abs/10.1063/1.5039518Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
The inter- and intra-molecular interactions as they evolve in the course of glassy solidification
are studied by broadband dielectric—and Fourier-transform infrared—spectroscopy for oligomeric
derivatives of poly( ... [+]
The inter- and intra-molecular interactions as they evolve in the course of glassy solidification
are studied by broadband dielectric—and Fourier-transform infrared—spectroscopy for oligomeric
derivatives of poly(ethylene glycol) derivatives, namely, poly(ethylene glycol) phenyl ether acrylate
and poly(ethylene glycol) dibenzoate in the bulk and under confinement in nanoporous silica having
mean pore diameters 4, 6, and 8 nm, with native and silanized inner surfaces. Analyzing the spectral
positions and the oscillator strengths of specific IR absorption bands and their temperature dependencies enables one to trace the changes in the intra-molecular potentials and to compare it with the
dielectrically determined primarily inter-molecular dynamics. Special emphasis is given to the calorimetric glass transition temperature Tg and Tαβ ≈ 1.25Tg, where characteristic changes in conformation
appear, and the secondary β-relaxation merges with the dynamic glass transition (α-relaxation). Furthermore, the impact of main chain conformations, inter- and intra-molecular hydrogen bonding, and
nanometric confinement on the dynamic glass transition is unraveled. [-]
Proyecto de investigación
National Science Centre (Grant No. SONATA11: UMO-2016/21/D/ST3/01299) ; National Science Foundation (Polymers Program Award No. DMR-1508394)Drets d'accés
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