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Materiales dinámicos estabilizados a la luz

Hannes A Houck1,2,3, Eva Blasco3, Filip E Du Prez1

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Journal of the American Chemical Society
|June 27, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los nuevos materiales dinámicos se transforman entre los estados sólido y líquido utilizando sólo la luz visible. Esta formación y disociación de la red de polímeros estabilizados por la luz ocurre sin calor u otros desencadenantes, lo que permite propiedades de material sintonizables.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales
  • La fotoquímica

Sus antecedentes:

  • Los polímeros convencionales que responden a la luz a menudo necesitan longitudes de onda o calor específicos para cambios de enlace covalente reversibles.
  • Los métodos existentes para la adaptación de polímeros pueden incluir disparadores invasivos, lo que limita su ámbito de aplicación.
  • La química covalente dinámica ofrece vías para crear redes de materiales adaptables.

Objetivo del estudio:

  • Desarrollar materiales dinámicos estabilizados por la luz que se sometan a cambios topológicos reversibles utilizando luz visible.
  • Para evitar la necesidad de desencadenantes externos como el calor o longitudes de onda específicas para la adaptación del material.
  • Explorar el uso de reacciones foto-Diels-Alder para la formación y disociación de redes de polímeros controladas por la luz.

Principales métodos:

  • Utilizó la reacción foto-Diels-Alder entre las triazolinedionas y los naftalenos como mecanismo dinámico de enlace cruzado covalente.
  • Utilizó luz verde visible para inducir la formación de una red, creando un material covalentemente enlazado.
  • Se ha observado una ciclorreversión espontánea en la oscuridad a temperatura ambiente para convertir el material en un estado líquido.

Principales resultados:

  • Demostró una transición repetible de materiales poliméricos de una formulación sólida enlazada a una líquida únicamente mediante el encendido y apagado de una fuente de luz visible.
  • Se demostró que los enlaces cruzados covalentes se estabilizan con luz visible, manteniendo la integridad del material bajo iluminación.
  • Se confirmó el colapso espontáneo de la red en la oscuridad a través de la ciclo-reversión sin intervención externa.

Conclusiones:

  • Desarrolló nuevos materiales dinámicos estabilizados por la luz que ofrecen cambios reversibles en la topología bajo demanda utilizando luz visible.
  • La reacción foto-Diels-Alder proporciona una plataforma efectiva para la dinámica de la red de polímeros controlada por la luz.
  • Estos materiales tienen potencial para aplicaciones dirigidas a la luz donde las propiedades sintonizables como la rigidez pueden ser controladas por la luz y la oscuridad.