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Catálisis interna en redes adaptadas covalentes: la transesterificación del monoestero de ftalato como una química de
Maarten Delahaye1, Johan M Winne2, Filip E Du Prez1
1Polymer Chemistry Research Group (PCR), Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry , Ghent University , Krijgslaan 281 S4-bis , B-9000 Ghent , Belgium.
Journal of the American Chemical Society
|August 31, 2019
Resumen
Este estudio presenta los monoésteres de ftalato como una nueva plataforma para crear redes de polímeros adaptables. Estas redes adaptables covalentes (CAN) ofrecen propiedades sintonizables y reciclabilidad a través de un mecanismo catalítico interno único.
Área de la Ciencia:
- Química de los polímeros
- Ciencias de los materiales
Sus antecedentes:
- Las redes adaptables covalentes (CAN) generalmente dependen de catalizadores externos para el intercambio dinámico de enlaces.
- La catálisis interna ofrece un enfoque más suave e integrado para los CAN.
Objetivo del estudio:
- Introducir los monoésteres de ftalato como una nueva plataforma química para los AAN.
- Demostrar el mecanismo catalítico interno para el intercambio dinámico de bonos en estas redes.
- Preparar y caracterizar una serie de CAN con propiedades sintonizables.
Principales métodos:
- Estudio del modelo de bajo peso molecular de la transesterificación del monoester de ftalato.
- Mezclas curativas de diolos, triolos y anhídridos ftalicos bifuncionales.
- Experimentos de reciclaje y pruebas de relajación de tensiones reológicas.
- Análisis de las propiedades de la red, incluida la estabilidad hidrolítica y la respuesta a la temperatura.
Principales resultados:
- Los monoésteres de ftalatos se someten a una rápida transesterificación a través de la catálisis interna, formando un intermediario de anhídrido ftálico activado.
- Se sintetizó con éxito una serie de CAN con diversas propiedades.
- Las redes exhibieron reciclabilidad, resistencia a la deformación y comportamiento reológico dependiente de la temperatura.
- Se observó una alta energía de activación (120 kJ/mol) para las reacciones de intercambio.
- Se formaron redes de poliéster hidrolíticamente estables, capaces de la transición de gel a sol al calentarse en el disolvente.
Conclusiones:
- La química del monoester de ftalato proporciona una plataforma versátil para el desarrollo de nuevas redes adaptables covalentes.
- El mecanismo catalítico interno permite un intercambio dinámico eficiente de enlaces y propiedades de red sintonizables.
- Estos CAN demuestran el potencial de materiales reciclables y sensibles con aplicaciones en sistemas de polímeros avanzados.
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