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

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

Palavras-chave:

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

Resumo

Neste trabalho foi estudada a atividade catalítica do acetato de samário (III) (SmAc₃) como iniciador na copolimerização de ε-caprolactona (CL) com L-láctido (L-LA) e o-fenantrolina-tris(glicina). )-κ3COO-samário (III) (A3) como iniciador na copolimerização de CL com os carbonatos cíclicos, carbonato de trimetileno (TMC) e carbonato de 2,2-dimetil-1,3-trimetileno (DMTC). Os produtos obtidos foram caracterizados por espectroscopia de ressonância magnética nuclear, cromatografia de exclusão de tamanho e análise termogravimétrica. Os resultados indicaram que SmAc3 induziu a copolimerização de CL com L-LA, obtendo materiais poliméricos com uma estrutura de copolímero aleatória cujas distribuições de massa molar tornaram-se mais amplas à medida que aumentava a proporção de L-LA na cadeia polimérica. No caso da copolimerização de CL com carbonatos cíclicos usando A3 como iniciador, os resultados indicaram que a atividade catalítica depende fortemente do carbonato cíclico usado como comonômero, ou seja, a copolimerização é influenciada pelo efeito estérico.

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