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

Author(s)

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

• Document type: Journal article
• Source: International Journal of Biological Macromolecules; v. 243, p. 6-pg., 2023-06-10.

Abstract

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)

• FAPESP's process: 10/00005-4 - Cellulose esters from homogeneous and heterogeneous media: optimization of parameters of synthesis and preparation of biocomposites based on cellulose esters and cellulose
• Grantee: Bruno Vinícius Manzolli Rodrigues
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)