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Two-dimensional subnanometer confinement of ethylene glycol and Poly(ethylene oxide) by neutron spectroscopy: Molecular size effects

Autor Barroso-Bujans, Fabienne ; Fernández-Alonso, Félix; Cerveny, Silvina ; Arrese-Igor, Silvia ; Alegría, Ángel ; Colmenero de León, Juan
Fecha de publicación 2012
EditorAmerican Chemical Society
Citación Macromolecules 45(7): 3137-3144 (2012)
ResumenWe explore the effects of chain size on the structure and dynamics of ethylene glycol (EG) and poly(ethylene oxide) (PEO) intercalated in graphite oxide (GO). To this end, EG as well as a PEO series of increasing chain length have been studied by means of high-resolution inelastic neutron spectroscopy. The neutron experiments are complemented by X-ray diffraction, differential scanning calorimetry, Fourier-transform infrared spectroscopy, and Raman scattering. We find that EG is accommodated in a layer of thickness ∼3 Å within the GO substrate and adopts a preferential, yet largely disordered, gauche conformation. Longer PEO chains give rise to a layer thickness in the range ∼3.0-3.4 Å characterized by planar zigzag (trans-trans-trans) conformations. Moreover, we observe a strong reduction of vibrational motions for the confined EG and polymer phases, as clearly evidenced by the disappearance, shift, and/or broadening of mode-specific inelastic neutron scattering spectral features, as well as by the complete suppression of crystallization. All of these effects are surprisingly insensitive to the length of the PEO chains. © 2012 American Chemical Society.
URI http://hdl.handle.net/10261/101836
Identificadoresdoi: 10.1021/ma202655f
issn: 0024-9297
e-issn: 1520-5835
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