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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Polímeros supramoleculares conmutables a partir del autoensamblaje de un pequeño monómero con dos interacciones de
Gerd Gröger1, Wolfgang Meyer-Zaika, Christoph Böttcher
1Institut für Organische Chemie, Universität Duisburg-Essen, Universitätsstrasse 7, 45141 Essen, Germany.
Journal of the American Chemical Society
|May 6, 2011
Resumen
Un nuevo monómero se autoensambla en polímeros supramoleculares en soluciones polares a través de la complejación metal-ligando y la dimerización zwitteriónica. Estos polímeros exhiben estados conmutables, ofreciendo un control dinámico sobre el autoensamblaje para aplicaciones de materiales avanzados.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- La ciencia de los polímeros es la ciencia de los polímeros.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los monómeros de bajo peso molecular pueden formar estructuras supramoleculares complejas.
- Las interacciones de unión ortogonales son clave para el autoensamblaje controlado.
- El autoensamblaje conmutable es crucial para los materiales dinámicos.
Objetivo del estudio:
- Para investigar el autoensamblaje de un monómero heteroditópico en polímeros supramoleculares.
- Para caracterizar la estructura y las propiedades de los polímeros resultantes.
- Para explorar la naturaleza conmutable del proceso de autoensamblaje.
Principales métodos:
- La dispersión dinámica de luz basada en láser infrarrojo (DLS)
- La dispersión de neutrones de ángulo pequeño (SANS, por sus siglas en inglés)
- Microscopía electrónica de transmisión (TEM, cryo-TEM) es una técnica
- Mediciones de viscosidad Mediciones de viscosidad.
Principales resultados:
- El monómero 1 forma polímeros supramoleculares lineales (hasta 100 nm) en soluciones polares a través de las interacciones metal-ligando y zwitteriónicas.
- La polimerización supramolecular sigue un mecanismo de cadena de anillo, aumentando significativamente la viscosidad de la solución.
- Los polímeros se agregan en estructuras globulares más grandes y exhiben estados conmutables (monómero, dímero, polímero) controlables por estímulos externos.
Conclusiones:
- El monómero heteroditópico 1 forma de manera fiable polímeros supramoleculares estables en disolventes polares.
- El proceso de autoensamblaje es reversible y puede controlarse mediante la coordinación de iones metálicos y la protonación/deprotonación.
- Este trabajo demuestra una plataforma versátil para crear materiales supramoleculares conmutables.
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