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Interfaces de polímero difuso en nanoemulsiones lobuladas conservadas en un medio acuoso
Ginam Kim1, Alioscka Sousa, Deborah Meyers
1Dow Corning Corporation, Science and Technology, Midland, Michigan 48640, USA. g.kim@dowcorning.com
Journal of the American Chemical Society
|May 18, 2006
Resumen
Los investigadores descubrieron que las interfaces de polímero en nanocolloides son difusas debido al atrapamiento cinético, no al equilibrio. Este hallazgo ofrece nuevas formas de controlar las interfaces de la nanoestructura del polímero durante la síntesis.
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:
- Las nanoestructuras de polímero a menudo exhiben interfaces distintas.
- La termodinámica de equilibrio predice interfaces nítidas en la escala nanométrica para polímeros inmiscibles.
Objetivo del estudio:
- Para investigar la naturaleza de la interfaz polímero-polímero en los nanocolloides de dos fases.
- Comprender los factores que influyen en la formación de interfaces en las nanoestructuras poliméricas multicomponentes.
Principales métodos:
- Microscopía electrónica de transmisión por crioscáner (STEM, por sus siglas en inglés)
- Espectroscopia de pérdida de energía de electrones de valencia (EELS)
Principales resultados:
- Se observó que la interfaz polímero-polímero en los nanocolloides de polidimetilsiloxano (PDMS) y copolímero (metilacrilato-metilacrilato-acetato de vinilo) es difusa.
- Esta interfaz difusa se desvía de las predicciones basadas en la termodinámica de equilibrio.
- El atrapamiento cinético del copolímero dentro de la fase PDMS fue identificado como la causa de la interfaz difusa.
Conclusiones:
- Las vías de no equilibrio pueden conducir a interfaces difusas de polímeros en nanocoloides.
- El atrapamiento cinético ofrece un mecanismo para controlar las propiedades interfaciales en sistemas de polímeros multicomponentes.
- Los hallazgos sugieren nuevas estrategias para sintetizar nanoestructuras poliméricas con interfaces personalizadas.
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