纤维素在不同氢键碱度和微观结构的离子液体溶剂中的溶解状态及溶解过程,Green Chemistry

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纤维素在不同氢键碱度和微观结构的离子液体溶剂中的溶解状态及溶解过程
Green Chemistry ( IF 9.3 ) Pub Date : 2022-04-14 , DOI: 10.1039/d2gc00374k
Yan Zhou _{1,

2} , Xiaocheng Zhang ₁ , Dongxiao Yin ₃ , Jinming Zhang ₁ , Qinyong Mi ₁ , Hongchao Lu ₁ , Dehai Liang ₃ , Jun Zhang _{1,

2}

Affiliation

纤维素溶液状态和形成机理是纤维素科学和相关产业的基础和本质问题。在此，我们揭示了一系列离子液体 (ILs) 和 IL/共溶剂系统中的纤维素溶液状态和形成机制。ILs和助溶剂的种类和用量对纤维素的初始溶液状态和溶解过程有显着影响。基于醋酸盐的离子液体和高共溶剂含量有利于形成分子分散状态。相比之下，基于氯化物的离子液体或低含量的助溶剂使纤维素呈单分子链和未溶解的纤维素微区共存状态，逐渐转变为分子分散状态。离子液体和助溶剂的氢键碱度和微观结构是纤维素初始溶液状态和溶解过程的决定因素。在具有高氢键碱度 (>0.92) 和小离子簇结构的 IL/助溶剂体系中，直接形成分子分散的纤维素溶液。如此清晰而全面的溶液状态、溶解过程和调节原理的概述对于了解纤维素溶解、表征纤维素的物理性质、控制均相衍生化和加工纤维素材料具有至关重要的意义。直接形成纤维素的分子分散溶液。如此清晰而全面的溶液状态、溶解过程和调节原理的概述对于了解纤维素溶解、表征纤维素的物理性质、控制均相衍生化和加工纤维素材料具有至关重要的意义。直接形成纤维素的分子分散溶液。如此清晰而全面的溶液状态、溶解过程和调节原理的概述对于了解纤维素溶解、表征纤维素的物理性质、控制均相衍生化和加工纤维素材料具有至关重要的意义。

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The solution state and dissolution process of cellulose in ionic-liquid-based solvents with different hydrogen-bonding basicity and microstructures

The cellulose solution state and formation mechanism are fundamental and essential issues in cellulose science and related industry. Herein, we revealed the cellulose solution state and formation mechanism in a series of ionic liquids (ILs) and IL/co-solvent systems. The types and amounts of ILs and co-solvents have a significant influence on the initial solution state and the dissolution process of cellulose. Acetate-based ILs and a high co-solvent content are beneficial to the formation of a molecularly dispersed state. In contrast, chloride-based ILs or a low content of co-solvents make cellulose adopt a coexistence state of single molecular chains and undissolved cellulose microdomains, which gradually convert into a molecularly dispersed state. The hydrogen-bonding basicity and microstructure of ILs and co-solvents are the determining factors for the initial solution state and dissolution process of cellulose. In IL/co-solvent systems with a high hydrogen-bonding basicity (>0.92) and a small ion cluster structure, a molecularly dispersed solution of cellulose forms directly. Such a clear and comprehensive outline of the solution state, dissolution process and regulation principles is of critical significance to understand cellulose dissolution, characterize the physical properties of cellulose, control homogeneous derivatization, and process cellulose materials.

更新日期：2022-04-14

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