Degradation behavior of cellulose in imidazolium-based ionic liquids

In order to study the degradation behavior of cellulose in imidazolium-based ionic liquids,the influence of temperature,time and agitation speed on degradation behavior of cellulose was studied by orthogonal experiment,and the degradation behavior of cellulose in four kinds of different ionic liquids was compared.The results showed that the optimum degradation conditions for cellulose in 1-ethyl-3-methylimidazolium acetate(Ac) were: temperature 80 ℃,dissolution time 1 hour and agitation speed 230 r/min.Dissolution temperature has the greatest influence on the cellulose degradation,followed by dissolution time and agitation speed.Under the same conditions,cellulose showed least degradation in Ac,and the most serious degradation in 1-ally-3-methylimidazolium chloride(Cl),and on the other hand,propyl gallate could reduce the degradation of cellulose obviously in ionic liquid solutions.In the presence of propyl gallate,acetate imidazolium-based ionic liquids Ac and 1-butyl-3-methylimidazolium acetate(Ac) exhibit mauve and the color disappears after dissolution of cellulose.