Solventes verdes para biopolímeros: síntese e aplicação de líquidos iônicos na derivatização de celulose / Green solvents for biopolymers: synthesis of ionic liquids and their use in derivatization of cellulose

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

06/10/2011

RESUMO

The work reported has the target of studying the acylation of cellulose under homogeneous reaction conditions. Imidazolium-based ionic Liquids (ILs) were employed as solvents, and the reaction was assisted by a microwave. These following processes have been studied: Optimization of the synthesis of ILs; ii) Effects of the structure of ILs on the dissolution of cellulose; iii) Optimization of cellulose acylation. Experimental design has been applied in order to optimize the synthesis of ILs. The use of DMSO as a diluent decreased the efficiency of the synthesis. Dissolution of cellulose (eucalyptus, mercerized eucalyptus and mercerized cotton) in several ILs has shown the importance of the counter-ion and the structure of the cation side-chain. The addition of DMSO decreased the amount of dissolved cellulose. Experimental design has been applied in order to optimize the acetylation of cellulose. Reaction time, molar ratio acetic anhydride/anhydroglucose unit, and cellulose concentration influenced the reaction outcome.

ASSUNTO(S)

cellulose homogeneous acylation derivatização de celulose derivatization of cellulose dissolução de celulose dissolution of cellulose experimental design ionic liquids planejamento experimental síntese de líquidos iônicos solventes solvents synthesis optimization

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