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La supresión del orden mesoscópico por interacciones complementarias en polímeros supramoleculares
Jessalyn Cortese1, Corinne Soulié-Ziakovic, Sylvie Tencé-Girault
1Matière Molle et Chimie (UMR 7167 ESPCI-CNRS), Ecole Supérieure de Physique et Chimie Industrielles de la Ville de Paris (ESPCI ParisTech), 10 rue Vauquelin, 75005 Paris, France.
Journal of the American Chemical Society
|February 11, 2012
Resumen
Las interacciones complementarias en polímeros supramoleculares pueden alterar el orden, cambiando sorprendentemente las propiedades del material. Las interacciones más fuertes entre la timina (Thy) y la diaminotriazina (DAT) transformaron un polímero sólido en un líquido.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- Química supramolecular de las moléculas.
Sus antecedentes:
- Los polímeros supramoleculares utilizan interacciones no covalentes para su autoensamblaje.
- El control del orden mesoscópico es clave para ajustar las propiedades de los materiales.
- Los polímeros telecélicos ofrecen una plataforma para estudiar la dinámica del autoensamblaje.
Objetivo del estudio:
- Investigar cómo las interacciones complementarias influyen en el orden mesoscópico en polímeros supramoleculares.
- Para explorar el impacto de las interacciones de timina (Thy) y diaminotriazina (DAT) en la estructuración de polímeros.
- Para correlacionar los cambios en las interacciones moleculares con las propiedades macroscópicas de los materiales.
Principales métodos:
- Síntesis de polímeros supramoleculares telecélicos basados en el óxido de polipropileno (PPO), Thy y DAT.
- Caracterización del comportamiento de autoensamblaje y cristalización utilizando diversas técnicas.
- Análisis comparativo de sistemas con interacciones autocomplementarias (Thy) y complementarias (Thy-DAT).
Principales resultados:
- Los sistemas autocomplementarios (Thy) exhibieron orden lamellar y cristalización 2D.
- La adición de DAT interrumpió la segregación de la microfase e inhibió la cristalización de Thy.
- Las interacciones fuertes Thy-DAT impidieron la estructuración lamelar, a diferencia de las interacciones autocomplementarias más débiles.
Conclusiones:
- Las interacciones complementarias pueden suprimir el orden mesoscópico, lo que lleva a cambios de propiedad contraintuitivos.
- La fuerza de las interacciones moleculares específicas (por ejemplo, Thy-DAT) dicta el estado final del material (sólido versus líquido).
- Este trabajo destaca los principios de diseño para controlar la arquitectura y la función de polímeros supramoleculares.
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