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Poliésteres funcionalizados con ácido carboxílico de precisión en vitrímeros reprocesables

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Los investigadores desarrollaron polímeros reprocesables parecidos a los termofijos utilizando la copolimización de apertura de anillos. Estos nuevos materiales exhiben excelentes propiedades mecánicas y una alta recuperación de arrastre, superando las limitaciones termoestables tradicionales.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales

Sus antecedentes:

  • Los termofijos ofrecen una estabilidad superior, pero carecen de capacidad de reprocesamiento debido a los enlaces cruzados permanentes.
  • El desarrollo de alternativas termoestables reciclables es crucial para la sostenibilidad.

Objetivo del estudio:

  • Para sintetizar redes de polímeros reprocesables con propiedades parecidas a las de los termoestables.
  • Investigar la influencia de la composición del catalizador en las características de la red.

Principales métodos:

  • Los poliésteres de bajo peso molecular sintetizados a través de la copolimerización de apertura de anillo (ROCOP) de epoxidos y anhídrido succínico.
  • Redes de polímeros formadas utilizando el éter diglicídico del bisfenol A como enlace cruzado.
  • Se utilizan mezclas de catalizadores (bis ((2-etilhexanoato) y 1,8-diazabiciclo ((5.4.0) undec-7-eno) para controlar el endurecimiento y el intercambio dinámico de enlaces.

Principales resultados:

  • Se han logrado propiedades mecánicas sintonizables (elongación en el momento de la rotura 90%450%, UTS 0,3024 MPa).
  • Se ha demostrado una alta recuperación del creep (> 90% después de cinco ciclos).
  • Se ha confirmado la buena reprocesabilidad de las redes de polímeros sintetizados.

Conclusiones:

  • El enfoque ROCOP permite la creación de poliésteres funcionales para redes termofijas reprocesables.
  • El ajuste del catalizador ofrece un método para controlar el rendimiento mecánico y el comportamiento dinámico.
  • Este trabajo presenta una estrategia viable para el diseño de materiales termoestables sostenibles.