Cellulose Preferentially Dissolved over Xylan in Ionic Liquids through Precise Anion Interaction Regulated by Bulky Cations,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Cellulose Preferentially Dissolved over Xylan in Ionic Liquids through Precise Anion Interaction Regulated by Bulky Cations
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-18 , DOI: 10.1021/acssuschemeng.1c02492
Riki Kadokawa ₁ , Takatsugu Endo ₂ , Yoshiro Yasaka ₁ , Kazuaki Ninomiya ₃ , Kenji Takahashi ₁ , Kosuke Kuroda ₁

Affiliation

Due to its crystallinity, cellulose is one of the least soluble natural polymers. There are no solvents that can dissolve cellulose while not dissolving its readily soluble analogues, such as xylan. In this study, ionic liquids were selected as the solvent because the solvent–polysaccharide interaction can be precisely regulated by bulky cations. The bulky ionic liquids dissolved cellulose but not xylan at 100 °C within 60 min. Further investigation revealed that difference in dissolution behavior, and while the dissolution time of cellulose depended only on diffusivity, that of xylan depended on cation bulkiness as well as diffusivity. Molecular dynamics simulations and subsequent analyses showed that polysaccharides cannot form the most stable state in bulky ionic liquids because of the disorder of hydrogen bonds, supporting the difference in dissolution behavior. Our protocol for preferential dissolution is applicable to other natural materials.

中文翻译：

通过大体积阳离子调控的精确阴离子相互作用，纤维素优先溶解于木聚糖中的离子液体中

由于其结晶度，纤维素是溶解度最低的天然聚合物之一。没有任何溶剂可以溶解纤维素而不溶解其易溶的类似物，例如木聚糖。在本研究中，选择离子液体作为溶剂是因为溶剂-多糖相互作用可以通过大体积阳离子精确调节。庞大的离子液体在 100 °C 下在 60 分钟内溶解纤维素但不溶解木聚糖。进一步的研究表明，溶解行为存在差异，而纤维素的溶解时间仅取决于扩散率，而木聚糖的溶解时间取决于阳离子的体积和扩散率。分子动力学模拟和随后的分析表明，由于氢键的无序，多糖不能在庞大的离子液体中形成最稳定的状态，支持溶解行为的差异。我们的优先溶解协议适用于其他天然材料。

更新日期：2021-07-05

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11