Study on the dissolution behavior of different celluloses in quaternary ammonium base/imidazole compound solvent system

IF 2.4 3区化学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY

Carbohydrate Research Pub Date : 2025-04-17 DOI:10.1016/j.carres.2025.109498

Xiaoying Zhao , Miaoqing Liu , Haopeng Zhang , Lifeng Zhang , Jianjun Lu

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Abstract

In this study, tetraethylammonium hydroxide solution and imidazole compounds (1-methylimidazole, 1-ethylimidazole, 1-propylimidazole) were used to develop a new green solvent system with high solubility, wide solubility range and fast dissolution rate. This system dissolved up to 18 wt% microcrystalline cellulose (DP = 171), and the solubility reached 15 wt% even at room temperature. At the same time, this solvent system exhibited strong solubility for cellulose with different degrees of polymerization, and dissolved 16 wt% cotton pulp cellulose (DP = 527) and 14 wt% hemp cellulose (DP = 2146), with significantly improved solubility. The dissolution behavior of cellulose in a quaternary ammonium/imidazole solvent system was studied using XRD, FT-IR, TG, NMR and other characterization techniques. The results showed that imidazole compounds reduced the crystallinity of cellulose, weakened the inter-sheet bonding and van der Waals force of cellulose without destroying hydrogen bonds, and promoted the encapsulation of water molecules and quaternary ammonium cations, making the OH⁻ dispersion more uniform, thereby improving the ability of quaternary ammonium solution to dissolve cellulose. In the non-derivative quaternary ammonium base/imidazole compounded solvent system, there was no chemical reaction between the solvents, and the cellulose structure did not change before and after dissolution. This system did not significantly degrade cellulose with a low degree of polymerization. However, since high temperature conditions were required for dissolution, the DP of cellulose with a higher DP decreases significantly.

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不同纤维素在季铵盐/咪唑复合溶剂体系中的溶解行为研究

本研究以四乙基氢氧化铵溶液和咪唑类化合物（1-甲基咪唑、1-乙基咪唑、1-丙基咪唑）为原料，建立了一种溶解度高、溶解度范围宽、溶出速度快的新型绿色溶剂体系。该体系溶解了高达18 wt%的微晶纤维素（DP = 171），即使在室温下溶解度也达到15 wt%。同时，该溶剂体系对不同聚合度的纤维素均表现出较强的溶解性，分别溶解了16 wt%棉浆纤维素（DP = 527）和14 wt%大麻纤维素（DP = 2146），溶解性显著提高。采用XRD、FT-IR、TG、NMR等表征技术研究了纤维素在季铵/咪唑溶剂体系中的溶解行为。结果表明，咪唑类化合物在不破坏氢键的情况下，降低了纤维素的结晶度，削弱了纤维素的片间键和范德华力，促进了水分子和季铵阳离子的包封，使OH−分散更加均匀，从而提高了季铵溶液溶解纤维素的能力。在非衍生物季铵盐/咪唑复合溶剂体系中，溶剂之间没有发生化学反应，溶解前后纤维素结构没有变化。该体系对低聚合度的纤维素没有明显的降解作用。但由于溶解需要高温条件，DP较高的纤维素的DP显著降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Carbohydrate Research 化学-生化与分子生物学

CiteScore

5.00

自引率

3.20%

发文量

183

审稿时长

3.6 weeks

期刊介绍： Carbohydrate Research publishes reports of original research in the following areas of carbohydrate science: action of enzymes, analytical chemistry, biochemistry (biosynthesis, degradation, structural and functional biochemistry, conformation, molecular recognition, enzyme mechanisms, carbohydrate-processing enzymes, including glycosidases and glycosyltransferases), chemical synthesis, isolation of natural products, physicochemical studies, reactions and their mechanisms, the study of structures and stereochemistry, and technological aspects. Papers on polysaccharides should have a "molecular" component; that is a paper on new or modified polysaccharides should include structural information and characterization in addition to the usual studies of rheological properties and the like. A paper on a new, naturally occurring polysaccharide should include structural information, defining monosaccharide components and linkage sequence. Papers devoted wholly or partly to X-ray crystallographic studies, or to computational aspects (molecular mechanics or molecular orbital calculations, simulations via molecular dynamics), will be considered if they meet certain criteria. For computational papers the requirements are that the methods used be specified in sufficient detail to permit replication of the results, and that the conclusions be shown to have relevance to experimental observations - the authors'' own data or data from the literature. Specific directions for the presentation of X-ray data are given below under Results and "discussion".