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The Effect of Water on Rheology of Native Cellulose/Ionic Liquids Solutions
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1021/acs.biomac.7b00789 Behzad Nazari 1 , Nyalaliska W. Utomo 1 , Ralph H. Colby 1
Biomacromolecules ( IF 5.5 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1021/acs.biomac.7b00789 Behzad Nazari 1 , Nyalaliska W. Utomo 1 , Ralph H. Colby 1
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Cellulose coagulates upon adding water to its solutions in ionic liquids. Although cellulose remains in solution with much higher water contents, here we report the effect of 0–3 wt % water on solution rheology of cellulose in 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate. Fourier transform infrared spectroscopy, thermal gravimetric analysis, and polarized light microscopy were also used to study water absorbance to the solutions. Tiny amounts of water (0.25 wt %) can significantly affect the rheological properties of the solutions, imparting a yield stress, while dry solutions appear to be ordinary viscoelastic liquids. The yield stress grows linearly with water content and saturates at a level that increases with the square of cellulose content. Annealing the solutions containing small amounts of water at 80 °C for 20 min transforms the samples to the fully dissolved “dry” state.
中文翻译：
水对天然纤维素/离子液体溶液流变性的影响
纤维素在离子液体中加水时会发生凝结。尽管纤维素保留在具有更高水含量的溶液中，但我们在此报告了0–3 wt％的水对纤维素在1-丁基-3-甲基咪唑鎓氯化物和1-乙基-3-甲基咪唑鎓乙酸盐中的溶液流变性的影响。傅里叶变换红外光谱，热重分析和偏光显微镜也用于研究溶液的吸水率。少量的水（0.25 wt％）会显着影响溶液的流变性，产生屈服应力，而干燥的溶液似乎是普通的粘弹性液体。屈服应力随水含量线性增长，并随着纤维素含量的平方增加而饱和。
更新日期：2017-08-25
中文翻译：
水对天然纤维素/离子液体溶液流变性的影响
纤维素在离子液体中加水时会发生凝结。尽管纤维素保留在具有更高水含量的溶液中，但我们在此报告了0–3 wt％的水对纤维素在1-丁基-3-甲基咪唑鎓氯化物和1-乙基-3-甲基咪唑鎓乙酸盐中的溶液流变性的影响。傅里叶变换红外光谱，热重分析和偏光显微镜也用于研究溶液的吸水率。少量的水（0.25 wt％）会显着影响溶液的流变性，产生屈服应力，而干燥的溶液似乎是普通的粘弹性液体。屈服应力随水含量线性增长，并随着纤维素含量的平方增加而饱和。
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