Cellulose acylation in homogeneous and heterogeneous media: Optimization of reactions conditions

Autor(es)

Rodrigues, Bruno Vinicius Manzolli ; Polez, Roberta Teixeira ; El Seoud, Omar A. ; Frollini, Elisabete

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Biological Macromolecules; v. 243, p. 6-pg., 2023-06-10.

Resumo

The dependence of the DS on the acid anhydride/anhydroglucose unit ((RCO)2O/AGU) molar ratio was correlated using second-order polynomials. The regression coefficients of the (RCO)2O/AGU terms showed that increasing the length of the RCO group of the anhydride led to lower values of DS. For acylation under heterogeneous reaction conditions, the following were employed: acid anhydrides and butyryl chloride as acylating agents; iodine as a catalyst; N,N-dimethylformamide (DMF) as a solvent, pyridine, and triethylamine as solvents and catalysts. For acylation using acetic anhydride plus iodine, the values of DS correlate with reaction time by a second-order polynomial. Due to its role as a polar solvent and a nucleophilic catalyst, pyridine was the most effective base catalyst, independent of the acylating agent (butyric anhydride and butyryl chloride). (AU)

• Processo FAPESP: 10/00005-4 - Ésteres de celulose a partir de meios homogêneo e heterogêneo: otimização dos parâmetros de síntese e preparação de biocompósitos ésteres de celulose-celulose
• Beneficiário: Bruno Vinícius Manzolli Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto