USO DE DERIVADOS DE SAMARIO COMO INICIADORES DE LA COPOLIMERIZACIÓN DE Ε-CAPROLACTONA CON L-LACTIDA Y CON CARBONATOS CÍCLICOS.

Copolimerización de caprolactona con L-lactida y con carbonatos cíclicos

Autores/as

Jesús Miguel Contreras Ramírez Universidad de Los Andes https://orcid.org/0000-0002-7668-2816
Dimas Alejandro Médina Grupo de polímeros, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Mérida-Venezuela. https://orcid.org/0000-0003-4623-7700
Meribary Margarita Monsalve https://orcid.org/0000-0002-4883-806X

DOI:

https://doi.org/10.33936/revbasdelaciencia.v7i3.5312

Palabras clave:

Copolimerización, caprolactona, L-lactida, carbonatos cíclicos, acetato de samario (III)

Resumen

En este trabajo, se estudió la actividad catalítica del acetato de samario (III) (SmAc₃) como iniciador en la copolimerización de ε-caprolactona (CL) con la L-lactida (L-LA) y del o-fenantrolina-tris(glicina)-κ³COO-samario (III) (A3) como iniciador en la copolimerización de CL con los carbonatos cíclicos, trimetilén carbonato (TMC) y el 2,2-dimetil-1,3-trimetilén carbonato (DMTC). Los productos obtenidos fueron caracterizados mediante espectroscopia de resonancia magnética nuclear, cromatografía de exclusión por tamaño y análisis termogravimétrico. Los resultados indicaron que el SmAc₃ indujo la copolimerización de CL con la L-LA, obteniéndose materiales poliméricos con estructura de copolímeros al azar cuyas distribuciones de masas molares se hacían mas anchas en la medida que la proporción de L-LA en la cadena polimérica aumentaba. En el caso de la copolimerización de la CL con los carbonatos cíclicos usando A3 como iniciador, los resultados indicaron que la actividad catalítica depende fuertemente del carbonato cíclico usado como comonómero, es decir que la copolimerización esta influenciada por el efecto estérico.

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Citas

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