Cellulose acetate butyrates(CAB) were homogeneously synthesized in an ionic liquid,1-allyl-3-methyl-imidazolium chloride(AmimC1).By a sequence of first adding butyric anhydride and then acetic anhydride in the cellulo...Cellulose acetate butyrates(CAB) were homogeneously synthesized in an ionic liquid,1-allyl-3-methyl-imidazolium chloride(AmimC1).By a sequence of first adding butyric anhydride and then acetic anhydride in the cellulose/AmimCl solutions,CAB products with the butyryl contents ranging from 33% to 47%(mass) were obtained.NMR analysis showed that among the three OH groups of the anhydroglucose unit(AGU) of the synthesized CAB,the distribution of the butyryl moieties showed a preference at the C6 position,while the partial degree of substitution of acetyl moieties at the C6 position showed the minimum values.Solubility measurement showed that CAB samples readily dissolved in the common organic solvents,such as methyl ethyl ketone,dichloromethane,and ethyl acetate.展开更多
以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍...以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍射分析。研究了纤维素葡萄糖残基与对甲苯磺酰氯的摩尔比、纤维素原料(软木纤维素,棉纤维素以及蒸汽闪爆处理的软木纤维素、棉纤维素)种类及溶解方法对合成产物取代度的影响。展开更多
文摘Cellulose acetate butyrates(CAB) were homogeneously synthesized in an ionic liquid,1-allyl-3-methyl-imidazolium chloride(AmimC1).By a sequence of first adding butyric anhydride and then acetic anhydride in the cellulose/AmimCl solutions,CAB products with the butyryl contents ranging from 33% to 47%(mass) were obtained.NMR analysis showed that among the three OH groups of the anhydroglucose unit(AGU) of the synthesized CAB,the distribution of the butyryl moieties showed a preference at the C6 position,while the partial degree of substitution of acetyl moieties at the C6 position showed the minimum values.Solubility measurement showed that CAB samples readily dissolved in the common organic solvents,such as methyl ethyl ketone,dichloromethane,and ethyl acetate.
文摘以二甲基乙酰胺(DM A c)/L iC l为溶剂体系、以三乙胺(TEA)为催化剂,将完全溶解的不同种类的天然纤维素原料和对甲苯磺酰氯(T os-C l)在均相条件下进行对甲苯磺酰化反应。优化了反应条件,对产品进行了元素分析、红外光谱分析和X射线衍射分析。研究了纤维素葡萄糖残基与对甲苯磺酰氯的摩尔比、纤维素原料(软木纤维素,棉纤维素以及蒸汽闪爆处理的软木纤维素、棉纤维素)种类及溶解方法对合成产物取代度的影响。
