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首页> 外文期刊>Journal of Polymers and the Environment >Acetylation of Xanthan Gum in Ionic Liquid
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Acetylation of Xanthan Gum in Ionic Liquid

机译：黄原胶在离子液体中的乙酰化

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In this paper, we report acetylation of xanthan gum using acetic anhydride in an ionic liquid solvent, 1-butyl-3-methylimidazolium chloride (BMIMCl). Xanthan gum was dissolved with BMIMCl [2 % (w/w)] and the reaction was carried out in the presence of acetic anhydride (five equiv. for hydroxy groups in a repeating unit) with stirring the solution at elevated temperatures. The structures of xanthan gum acetates were confirmed by the H-1 NMR and IR spectra. The degree of acetylation (DA) values determined by the H-1 NMR analysis increased with the higher reaction temperatures. The thermal gravimetric analysis (TGA) indicated the enhancement of thermal stability by acetylation. Furthermore, the TGA as well as differential scanning calorimetric (DSC) analysis of the products suggested the presence of the highly and less acetylated segments in a xanthan gum chain. The DSC profile of the product with the high DA value also exhibited a small endothermic peak, which might potentially be ascribed to the melting temperature.
机译：在本文中，我们报告了在离子液体溶剂1-丁基-3-甲基咪唑鎓氯化物（BMIMCl）中使用乙酸酐对黄原胶进行乙酰化的报道。将黄原胶用BMIMCl [2％（w / w）]溶解，并在乙酸酐（重复单元中的羟基当量为5当量）存在下，在升高的温度下搅拌溶液的同时进行反应。黄原胶乙酸酯的结构通过H-1 NMR和IR光谱确认。通过H-1 NMR分析确定的乙酰化度（DA）值随较高的反应温度而增加。热重分析（TGA）表明通过乙酰化提高了热稳定性。此外，产品的TGA和差示扫描量热法（DSC）分析表明，在黄原胶链中存在高度乙酰化的片段和较少乙酰化的片段。具有高DA值的产物的DSC曲线也显示出小的吸热峰，这可能归因于熔融温度。

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