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El poli (lactida) nanoporoso por la degradación de la metástasis de las olefinas
Arthur Bertrand1, Marc A Hillmyer
1Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431, USA.
Journal of the American Chemical Society
|July 23, 2013
Resumen
Los investigadores crearon poli (lactide) nanoporoso ordenado usando copolímeros de bloque de poli (butadieno) y poli (lactide) autoensambladores. La degradación selectiva del bloque de poli (butadieno) produjo un material poli (lactido) nanoporoso.
Área de la Ciencia:
- La ciencia de los polímeros es la ciencia de los polímeros.
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- El polilactido (PLA) es un polímero biodegradable con aplicaciones potenciales en varios campos.
- La creación de estructuras nanoporosas ordenadas en polímeros es un desafío, pero ofrece propiedades materiales mejoradas.
Objetivo del estudio:
- Desarrollar un método novedoso para la fabricación de poli (lactida) nanoporoso ordenado.
- Para utilizar el autoensamblaje de copolímeros de bloque y la degradación selectiva para la síntesis de materiales nanoporosos.
Principales métodos:
- Síntesis de poli (butadieno) - poli (lactido) (PB-PLA) copolímeros de dibloque a través de polimerizaciones de transesterificación aniónica y de apertura de anillo.
- Inducción de morfologías separadas por microfasas (lamelares, cilíndricas) a través de masas molares de bloque personalizadas.
- Orientación de los nanodomains a través del recocido con disolventes (películas delgadas) y la deformación mecánica (monolitos).
- La degradación selectiva del bloque de poli (butadieno) utilizando el catalizador de primera generación de Grubbs y la metátesis de olefinas.
Principales resultados:
- Sintetizó con éxito copolímeros diblock PB-PLA con longitudes y morfologías de bloques controladas.
- Se logró la eliminación selectiva del bloque de poli (butadieno), dejando atrás una estructura de poli (lactido) nanoporosa.
- Se confirmó la eliminación de PB utilizando cromatografía de exclusión de tamaño y (1) H NMR espectroscopia.
- Se visualizó el resultante poli (lactida) nanoporoso utilizando microscopía electrónica de barrido.
Conclusiones:
- Este estudio presenta una estrategia efectiva para crear materiales ordenados nanoporosos polilactidos.
- La combinación del autoensamblaje del copolímero de bloque y la degradación química selectiva ofrece un control preciso sobre la estructura nanoporosa.
- El método desarrollado proporciona una plataforma versátil para la fabricación de polímeros nanoporosos avanzados.
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