Graduate School of Engineering, Research Center of Supercritical Fluid Technology, Tohoku University Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai 980-8579, Japan.
Carbohydr Polym. 2013 Jan 30;92(1):651-8. doi: 10.1016/j.carbpol.2012.09.021. Epub 2012 Sep 29.
The dissolution and recovery of microcrystalline cellulose from 1-butyl-3-methylimidazolium chloride, [bmIm][Cl], were studied. At 90 °C and 5 h dissolution time, the regenerated cellulose could be recovered above 80 wt% with a less than 10% decrease in the value of the viscosity-average degree of polymerization, DP(v), regardless of water content. Recovery ratio and DP(v) of regenerated cellulose at 120 °C decreased with time regardless of water content. The regenerated cellulose after dissolution at 120 °C for 10 h regardless of water content had cellulose II structure. Regenerated cellulose at short dissolution times or low temperature had high amorphous content. Both [bmIm][Cl] and [bmIm][Cl] with water act as a non-derivatizing solvent for microcrystalline cellulose at 90 °C, and as a derivatizing solvent at 120 °C. The main effect of added water on the dissolution of cellulose at high temperature was the promotion of cello-oligosaccharide and levoglucosan formation.
研究了从 1-丁基-3-甲基咪唑氯化物([bmIm][Cl])中溶解和回收微晶纤维素。在 90°C 和 5 小时溶解时间下，无论水含量如何，再生纤维素的回收率均可超过 80wt%，且粘均聚合度(DP(v))的降低值小于 10%。无论水含量如何，在 120°C 下，再生纤维素的回收率和 DP(v)随时间的延长而降低。无论水含量如何，在 120°C 下溶解 10 小时后的再生纤维素均具有纤维素 II 结构。在短溶解时间或低温下再生的纤维素具有较高的无定形含量。[bmIm][Cl]和含水分的[bmIm][Cl]在 90°C 下均对微晶纤维素起到非衍生化溶剂的作用，而在 120°C 下起到衍生化溶剂的作用。添加水对高温下纤维素溶解的主要影响是促进了低聚糖和左旋葡聚糖的形成。
