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Dinámica del agua e interacciones en mezclas binarias agua-poliéter.

Emily E Fenn1, David E Moilanen, Nancy E Levinger

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

Journal of the American Chemical Society
|March 28, 2009
PubMed
Resumen

Este estudio revela distintos comportamientos de las moléculas de agua en las soluciones de óxido de polietileno (PEO) utilizando espectroscopia infrarroja ultrarrápida. Las moléculas de agua interactúan ya sea con otras moléculas de agua o con la columna vertebral del éter PEO, mostrando patrones únicos de relajación dinámica.

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Área de la Ciencia:

  • La ciencia de los polímeros es la ciencia de los polímeros.
  • Química Física es la química física.
  • La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

  • El óxido de polietileno (PEO) es un polímero versátil con aplicaciones en membranas, cristalización y dispositivos médicos.
  • Las propiedades únicas del PEO se derivan de sus interacciones con el agua, formando enlaces de hidrógeno.
  • Los estudios dinámicos de las interacciones PEO-agua son escasos, particularmente con respecto a las interacciones de éter oxígeno frente a los grupos hidroxilo.

Objetivo del estudio:

  • Investigar las interacciones dinámicas del agua con la columna vertebral del éter de PEO.
  • Para diferenciar las dinámicas del agua asociadas con la columna vertebral del polímero de las del agua a granel.
  • Para comprender el comportamiento de las moléculas de agua en los derivados de PEO con terminación metilo.

Principales métodos:

  • Espectroscopia selectiva de polarización por infrarrojos ultrarrápidos con bomba y sonda.
  • Medición del modo de estiramiento hidroxilo del agua.
  • Análisis de las dinámicas de relajación vibratoria y de orientación en mezclas de agua/tetraetilenglicol dimetil éter (TEGDE).

Principales resultados:

  • Se identificaron dos subconjuntos de agua distintos: agua-agua con enlace de hidrógeno y agua-TEGDE asociados.
  • La relajación orientativa del agua mostró una rápida (picosegundos) y una lenta (aprox. 20 ps) el componente de descomposición.
  • Estas dinámicas se observaron incluso en bajas concentraciones de agua, lo que sugiere la acumulación de agua.

Conclusiones:

  • Las moléculas de agua en las soluciones de PEO existen en distintos estados dinámicos.
  • El estudio pone de relieve las interacciones específicas entre el agua y la columna vertebral del éter PEO.
  • Los hallazgos proporcionan información sobre los cambios estructurales y las interacciones hidrofóbicas en diferentes niveles de contenido de agua.