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Topología de conmutación fotográfica en redes de polímeros con jaulas metálico-orgánicas como enlaces cruzados
Yuwei Gu1, Eric A Alt1, Heng Wang2
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nature
|July 20, 2018
Resumen
Los investigadores desarrollaron una nueva red de polímeros utilizando jaulas orgánicas metálicas que pueden cambiar de forma reversible entre dos estados topológicos utilizando la luz. Este avance permite propiedades de materiales ajustables para aplicaciones avanzadas como la robótica suave.
Área de la Ciencia:
- Química de los polímeros
- Ciencias de los materiales
- Química supramolecular
Sus antecedentes:
- Las redes de polímeros ofrecen propiedades deseables como resistencia mecánica y procesamiento.
- El diseño de redes dinámicas de polímeros permite materiales que responden a estímulos y que se curen por sí mismos.
- Los sistemas existentes a menudo tienen estados operativos limitados o una capacidad de respuesta irreversible.
Objetivo del estudio:
- Diseñar un material capaz de cambiar entre dos estados topológicos distintos.
- Utilizar el autoensamblaje cooperativo con jaulas metálicas orgánicas unidas por polímeros.
- Para lograr la conmutación fotográfica reversible de la topología y las propiedades de la red.
Principales métodos:
- Autoensamblaje cooperativo empleado de jaulas metal-orgánicas unidas por polímeros.
- Se utiliza radiación ultravioleta o verde para alterar la forma y el tamaño de la jaula.
- Investigó los cambios resultantes en la topología de la red y las propiedades del material.
Principales resultados:
- Preparó con éxito un material que cambia entre dos estados topológicos a través de la conmutación por fotosíntesis.
- Se ha demostrado la conmutación reversible de la topología de red mediante luz ultravioleta o verde.
- Cambios coherentes observados en múltiples propiedades de la red, incluido el módulo mecánico y la autocuración.
Conclusiones:
- Los materiales con conmutación de topología ofrecen un nuevo paradigma para el diseño de polímeros sensibles.
- Las redes de polímeros fotointercambiables permiten el ajuste simultáneo de múltiples características de los materiales.
- Estos materiales tienen potencial para aplicaciones en robótica blanda, fotoactuadores y física de polímeros fundamentales.
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