Síntesis de poliésteres alifáticos vía polimerización por apertura de anillo organocatalítica: estudio de la influencia de los parámetros de reacción sobre sus propiedades térmicas y estructura molecular
DOI:
https://doi.org/10.29105/cienciauanl25.113-2Palabras clave:
poliésteres, ROP, catálisis orgánica, TBD, DBUResumen
Se reporta la síntesis de poli(L-lactida) (PLLA), poli(brasilato de etilo) (PEB), poli(ε-caprolactona) (PCL) y poli(ε-decalactona) (PDL), mediante polimerización por apertura de anillo (ROP) organocatalítica. Variaciones en parámetros de reacción, como el catalizador 1,8-diazabiciclo[5-4-0] undec-7-eno (DBU) o 1,4,7-triazabiciclodeceno (TBD), relación molar catalizador:iniciador, adición de donador de protón, y tiempo de reacción fueron evaluadas para alcanzar las más altas conversiones, también se determinaron las propiedades químicas y físicas de los poliésteres obtenidos. A través de las condiciones empleadas para estas reacciones de ROP se lograron conversiones mayores a 90%, pesos moleculares promedio en número (Mn) de ~20 kDa, y valores de dispersidad (Ð) de 1.45–1.90. Igualmente, estos poliésteres alifáticos desarrollaron alta estabilidad térmica (>200°C) y sus transiciones térmicas fueron observadas a temperaturas cercanas a las transiciones reportadas en la bibliografía para estos poliésteres (PLLA, PEB, PCL).
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