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Instalación de un disparador para reciclar el polietileno de alta densidad

Tianhao Nan1,2, Quan Chen1,2, Zhangfan Zheng1,2

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Journal of the American Chemical Society
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Resumen

La introducción de enlaces dobles carbono-carbono en el polietileno a través de la copolimización etileno/butadieno permite una degradación controlada. Esto crea oligómeros valiosos para el reciclaje, lo que promueve el desarrollo sostenible de poliolefinas.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales
  • Química sustentable

Sus antecedentes:

  • El polietileno (PE) carece de sitios de degradación inherentes, lo que dificulta el reciclaje sostenible.
  • La introducción de bonos CC en el PE ofrece una estrategia para la degradación y el reciclaje controlados.
  • Los métodos existentes para la incorporación de enlaces CC se enfrentan a desafíos en el control de la composición y la regularidad del copolímero.

Objetivo del estudio:

  • Desarrollar un método controlado para la incorporación de enlaces CC en PE a través de la copolimización.
  • Investigar las propiedades y el comportamiento de degradación del copolímero etileno/butadieno (E/BD) resultante.
  • Demostrar el potencial de reciclado de los productos de degradación.

Principales métodos:

  • Se utilizó un complejo de gadolinio amidinado para la copolimización de etileno y butadieno (E/BD).
  • Caracterizó las propiedades del copolímero, comparándolos con el PE comercial de alta densidad.
  • Investigó la degradación del copolímero en oligómeros α,ω-telecélicos.
  • Se ha demostrado el upcycling de oligómeros en compatibilizadores a través de la polimerización radical por transferencia atómica y la polimerización por apertura de anillo inmortal.

Principales resultados:

  • Se ha conseguido una copolimerización controlada de E/BD con butadieno incorporado en un modo uniforme 1.4.
  • El copolímero resultante exhibió propiedades físicas, mecánicas, de procesamiento y antioxígenas comparables a las del PE comercial de alta densidad.
  • Los enlaces CC incorporados facilitaron la degradación controlada en oligómeros α,ω-telecélicos de distribución estrecha.
  • Se recicló con éxito estos oligómeros en compatibilizadores funcionales.

Conclusiones:

  • El complejo de gadolinio amidinado permite la copolimización controlada de E/BD para la funcionalización del PE.
  • El PE funcionalizado mantiene las propiedades deseables al tiempo que permite una degradación controlada.
  • Este enfoque ofrece una vía viable para el reciclaje sostenible de poliolefinas en materiales valiosos.