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La polimerización por inserción/isomerización del 1,5-hexadieno: síntesis de copolímeros funcionales de propileno y
Phillip D Hustad1, Geoffrey W Coates
1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.
Journal of the American Chemical Society
|September 26, 2002
Resumen
Los catalizadores de titanio permiten la polimerización del 1,5-hexadieno, produciendo polímeros con unidades únicas de vinilo tetrametileno. Este descubrimiento facilita la creación de copolímeros de polipropileno funcionales para vinilo y copolímeros de bloque.
Área de la Ciencia:
- Química de Polímeros La química de los polímeros es la química de los polímeros.
- Catálisis organometálica por catálisis orgánica.
Sus antecedentes:
- Los complejos de titanio bis ((phenoxyimine) son catalizadores efectivos para la polimerización de las olefinas.
- La polimerización del 1,5-hexadieno generalmente produce polímeros con microestructuras específicas.
Objetivo del estudio:
- Para investigar la polimerización del 1,5-hexadieno utilizando un catalizador de titanio bis (fenoximina).
- Para dilucidar el mecanismo detrás de la formación de microestructuras de polímeros inesperados.
- Explorar la aplicación de este sistema catalítico en la síntesis de copolímeros funcionalizados.
Principales métodos:
- La polimerización catalítica del 1,5-hexadieno mediante el uso de un catalizador de titanio bis ((phenoxyimine).
- Análisis microestructural del polímero resultante utilizando técnicas espectroscópicas.
- Investigación de las reacciones de copolimerización y de copolimerización en bloque.
Principales resultados:
- La polimerización produjo polímeros que contenían tanto las unidades esperadas de metileno-1,3-ciclopentano como las inesperadas unidades de 3-vinilo tetrametileno.
- Se propuso un mecanismo de reacción para explicar la formación de la microestructura observada.
- El sistema catalítico se aplicó con éxito para sintetizar copolímeros de polipropileno funcionales de vinilo y copolímeros de bloque con baja polidispersidad.
Conclusiones:
- El sistema de catalizador de titanio bis ((phenoxyimine) impulsa una vía de polimerización inusual para el 1,5-hexadieno.
- Este sistema catalítico ofrece una nueva ruta para la producción de poliolefinas funcionalizadas y copolímeros de bloque con arquitecturas controladas.
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