Rheology and dissolution capacity of cellulose in novel [mTBNH][OAc] ionic liquid mixed with green co-solvents

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-01-18 DOI:10.1007/s00397-024-01433-3

Elvira Tarasova, Nutan Savale, Peeter-Mihkel Ausmaa, Illia Krasnou, Andres Krumme

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Abstract

Dissolution of cellulose is crucial for its regeneration and chemical modification, such as homogeneous transesterification, for example. The cellulose dissolution in ionic liquid (IL) media is suggested as a prospective environmentally friendly alternative to conventional solvents. In this study, novel distillable ionic liquid 5-methyl-1,5,7-triaza-bicyclo-[4.3.0]non-6-enium acetate, [mTBNH][OAc] was used for cellulose dissolution. This IL has high dissolving power towards cellulose and durability for recycling. However, the disadvantage of ILs is their high viscosity, which limits the supreme cellulose concentration in IL solutions, and their high cost, hindering their commercialization. The addition of low-viscous, low-cost, and naturally derived co-solvents can reduce the overall viscosity and cost. In this study, rheology experiments were conducted to investigate the flow behavior of cellulose in [mTBNH][OAc] ionic liquid mixed with the green co-solvents such as γ-Valerolactone (GVL), dimethyl isosorbide (DMI), and N,N′-dimethylpropyleneurea (DMPU). A study of the rheology showed that the viscosity reduces at low doses of co-solvent (≤ 50 wt%) but causes the structuring of the cellulose solution and its gelation (or phase separation) at high doses (≥ 50 wt%). The rheological study also indicated that the flow activation energy of cellulose in IL/co-solvent systems is lower than that in pure IL and decays in the order of DMPU > DMI > GVL > DMSO.

Graphical abstract

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纤维素在与绿色助溶剂混合的新型[mTBNH][OAc]离子液体中的流变性和溶解能力

摘要纤维素的溶解对其再生和化学改性（如均相酯交换）至关重要。在离子液体（IL）介质中溶解纤维素被认为是一种替代传统溶剂的环保型方法。在这项研究中，新型可蒸馏离子液体 5-甲基-1,5,7-三氮杂双环-[4.3.0]非 6-烯醋酸酯 [mTBNH][OAc]被用于溶解纤维素。这种 IL 对纤维素有很强的溶解能力，而且经久耐用，可以循环使用。然而，IL 的缺点是粘度高，限制了 IL 溶液中纤维素的最高浓度，而且成本高，阻碍了其商业化。添加低粘度、低成本和天然衍生的助溶剂可以降低总体粘度和成本。本研究通过流变学实验研究了纤维素在[mTBNH][OAc]离子液体与γ-戊内酯（GVL）、二甲基异山梨醇（DMI）和N,N′-二甲基丙烯脲（DMPU）等绿色助溶剂混合后的流动行为。流变学研究表明，低剂量的助溶剂（≤ 50 wt%）会降低粘度，但高剂量的助溶剂（≥ 50 wt%）会导致纤维素溶液结构化和凝胶化（或相分离）。流变学研究还表明，纤维素在IL/共溶剂体系中的流动活化能低于纯IL中的流动活化能，并按照DMPU > DMI > GVL > DMSO的顺序衰减。图表摘要

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."