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Microscopia de fuerza atómica Mapeo nanomecánico Visualiza la ampliación interfacial entre redes debido a reacciones
Changfei He1, Shaowei Shi1, Xuefei Wu1
1Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites , Beijing University of Chemical Technology , Beijing 100029 , China.
Journal of the American Chemical Society
|May 19, 2018
Resumen
La ampliación interfacial en redes epoxi crea un nuevo material con propiedades mixtas. El mapeo nanomecánico reveló reacciones de intercambio y permitió la medición de la cinética de reacción y la energía de activación.
Área de la Ciencia:
- Ciencias de los Polímeros
- Ciencias de los materiales
- Nanotecnología
Sus antecedentes:
- La comprensión de las propiedades interfaciales es crucial para los materiales compuestos.
- Las redes epoxi se utilizan ampliamente en adhesivos y recubrimientos.
- Los módulos diferenciales en las redes de polímeros pueden conducir a un comportamiento interfacial único.
Objetivo del estudio:
- Mapear nanomecánicamente la ampliación interfacial entre dos redes epoxi con diferentes módulos.
- Para investigar la formación de una zona interfacial con propiedades graduadas.
- Determinar la cinética y la energía de activación de la mezcla de segmentos mediante reacciones de intercambio.
Principales métodos:
- Mapeo nanomecánico para analizar la ampliación de la interfaz.
- Medición de la variación del módulo en el tiempo y la temperatura.
- Determinación de la cinética y la energía de activación de las reacciones de intercambio.
Principales resultados:
- La ampliación interfacial crea una zona con un gradiente en la concentración y las propiedades.
- Se forma una nueva red con composición segmentaria de ambas redes originales.
- La mezcla a nivel de segmentos se produce a través de reacciones de intercambio.
- Se midió la cinética de la reacción de intercambio y se determinó la energía de activación.
Conclusiones:
- La ampliación interfacial en redes epóxidas diferentes da como resultado una zona de gradiente y una nueva red mezclada.
- El mapeo nanomecánico proporciona información sobre el proceso de mezcla de segmentos.
- El estudio cuantifica la cinética de reacción y la energía de activación de este fenómeno de mezcla.
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