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Explorando la separación de la microfasa en copolímeros de dibloqueo semifluorados: una investigación experimental y

Mona Semsarilar1, Martin J Greenall2, Alex H Balzer3,4

  • 1Institut Européen des Membranes (IEM), CNRS, ENSCM, Univ Montpellier, Montpellier 34090, France.

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Resumen

Este estudio explora los copolímeros de polistireno-bloque-poli (pentafluorostireno), revelando una transición del comportamiento de bobina-bobina al comportamiento de rod-coil impulsado por la longitud del bloque, no solo por las diferencias químicas. Esto pone de relieve el fuerte autoensamblaje en bloques de polímero similares.

Palabras clave:
Reflectometría de rayos X en rayos X.La dispersión de rayos X por dispersión de rayos X.Los copolímeros de bloque son también copolímeros de bloque.autoensamblaje de autoensamblaje.fuerte teoría de la segregación.

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Área de la Ciencia:

  • La ciencia de los polímeros es la ciencia de los polímeros.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.

Sus antecedentes:

  • Los copolímeros de bloque se autoensamblan en morfologías a nanoescala, cruciales para los materiales avanzados.
  • El poliestireno-bloque-poli (pentafluorostireno) ofrece un sistema modelo para estudiar el autoensamblaje debido al alto antagonismo entre los bloques.
  • Comprender la influencia de la longitud del bloque y la rigidez inherente de la cadena en el autoensamblaje es clave.

Objetivo del estudio:

  • Para investigar el comportamiento de autoensamblaje a granel de los copolímeros de doble bloque de poliestireno-bloque-poli (pentafluorostireno).
  • Para explorar la transición del comportamiento de segregación de bobina-bobina al comportamiento de segregación de rod-coil.
  • Para construir un diagrama de fase experimental y validar modelos teóricos.

Principales métodos:

  • Síntesis de 41 muestras de copolímero diblock utilizando polimerización por transferencia de cadena de adición-fragmentación reversible (RAFT).
  • Caracterización de la distribución y dispersión del peso molecular (D).
  • Análisis de morfologías a nanoescala mediante dispersión de rayos X de ángulo pequeño (SAXS) y microscopía electrónica de transmisión (TEM) después del recocido térmico.

Principales resultados:

  • Se observaron morfologías bien definidas a nanoescala, dependientes de la composición molecular.
  • Se construyó un diagrama de fase experimental, con un parámetro de interacción de Flory-Huggins (χ) estimado en 0,2.
  • Se observó una transición del comportamiento de la bobina de bobina al comportamiento de la bobina de varilla al reducir la longitud del bloque fluorado más rígido, sin alterar la temperatura o la composición química.

Conclusiones:

  • El estudio demuestra una fuerte separación de microfasas en copolímeros AB diblock con unidades químicas relativamente similares.
  • Se puede lograr una transición del comportamiento de segregación de la bobina de varillas al comportamiento de la bobina de bobinas ajustando la longitud del bloque.
  • Este trabajo proporciona información sobre el control del autoensamblaje a través de la manipulación de la rigidez y longitud del bloque.