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Cepillos de polímero en nanotubos de carbono de pared única por transferencia atómica polimerización radical del
Shuhui Qin1, Dongqi Qin, Warren T Ford
1Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Journal of the American Chemical Society
|January 8, 2004
Resumen
Los nanotubos de carbono de pared única (SWNT) fueron funcionalizados con cepillos de polímero utilizando la polimerización radical por transferencia atómica (ATRP). Este proceso mejoró la solubilidad de SWNT y descompuso los paquetes en tubos individuales, mejorando las propiedades del material.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los nanotubos de carbono de pared única (SWNT) poseen propiedades únicas, pero a menudo sufren de mala solubilidad y agregación.
- La funcionalización de los SWNT es crucial para su integración en materiales y aplicaciones avanzadas.
Objetivo del estudio:
- Para sintetizar cepillos de polímero injertados en las columnas vertebrales de SWNT.
- Para investigar el efecto del injerto de polímeros en la solubilidad y estructura de SWNT.
- Para controlar el crecimiento de polímeros mediante la polimerización radical por transferencia atómica (ATRP).
Principales métodos:
- Injerto de metacrilato de n-butilo (nBMA) de SWNTs a través de ATRP.
- Funcionalizando SWNTs con grupos de ácido carboxílico utilizando la oxidación con ácido nítrico.
- Caracterizar el peso molecular del polímero y la densidad de injerto utilizando SEC y TGA.
- Analizando la estructura y solubilidad de SWNT utilizando espectroscopia y AFM.
Principales resultados:
- Síntesis exitosa de cepillos de polímero en SWNT con peso molecular controlado.
- Mayor solubilidad de SWNT funcionalizados en disolventes orgánicos comunes.
- Evidencia de la disociación del haz de SWNT en tubos individuales después de la funcionalización y polimerización.
- Cambios mínimos en la funcionalidad de la pared lateral SWNT durante el proceso.
Conclusiones:
- El injerto de polímeros a través de ATRP es un método eficaz para mejorar la solubilidad y procesamiento de SWNT.
- El proceso de funcionalización y polimerización conduce a la desvinculación de las SWNT.
- Este enfoque ofrece una vía para crear nanocompuestos SWNT-polímero bien definidos.
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