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Mejora de las Propiedades Mecánicas del Sistema Aglutinante de Polibutadieno Terminado en Carboxilo (CTPB) Utilizando
Xiao Qu1, Peixuan Hu1,2, Xinyi Ma1
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Molecules (Basel, Switzerland)
|January 28, 2026
Resumen
Este estudio introduce un novedoso acelerador de curado para mejorar los sistemas aglutinantes de polibutadieno terminado en carboxilo (CTPB)/resina epoxi (EP) para propelentes sólidos. El sistema optimizado demuestra propiedades mecánicas significativamente mejoradas y una tasa de curado más rápida.
Área de la Ciencia:
- Ciencia de Materiales
- Química de Polímeros
- Tecnología de Propelentes
Sus antecedentes:
- Los sistemas aglutinantes de polibutadieno terminado en carboxilo (CTPB)/resina epoxi (EP) son cruciales para los propelentes sólidos, pero sufren de curado lento, problemas de post-curado y propiedades mecánicas inadecuadas.
- La optimización del proceso de curado es esencial para mejorar el rendimiento y la fiabilidad del aglutinante en aplicaciones de propelentes sólidos.
Objetivo del estudio:
- Optimizar el sistema aglutinante CTPB/EP para propelentes sólidos mediante la introducción de un novedoso acelerador de curado.
- Investigar el impacto del acelerador de curado en la cinética de curado y las propiedades mecánicas del sistema aglutinante.
- Establecer una metodología de preparación para sistemas aglutinantes a base de CTPB con elongación y resistencia a la tracción mejoradas.
Principales métodos:
- Incorporación de 593 compuestos de amina alifática como acelerador de curado en el sistema aglutinante CTPB/EP.
- Evaluación de las propiedades mecánicas, incluida la resistencia a la fractura y el alargamiento a la rotura.
- Determinación de la densidad de entrecruzamiento, la fracción de gel y la energía de activación de la reacción de curado.
Principales resultados:
- La adición del acelerador de curado mejoró significativamente la resistencia a la fractura y el alargamiento a la rotura del sistema aglutinante CTPB/EP.
- Con 0,3% en peso de acelerador de curado, la resistencia a la fractura por tracción alcanzó 0,37 MPa y el alargamiento a la rotura alcanzó el 655%.
- El aumento del contenido de acelerador de curado elevó sustancialmente la densidad de entrecruzamiento (4,3 × 10-4 mol/cm3 con 0,3% en peso) y redujo la energía de activación, lo que indica un curado más rápido.
Conclusiones:
- El sistema aglutinante CTPB/EP desarrollado exhibe alta elongación y resistencia a la tracción, abordando las limitaciones de los sistemas tradicionales.
- El estudio proporciona una base científica sólida para el uso de sistemas aglutinantes a base de CTPB con propiedades mejoradas en formulaciones de propelentes sólidos.
- Los hallazgos allanan el camino para mejorar el rendimiento y la fiabilidad de los propelentes sólidos a través de una química de aglutinantes optimizada.
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