Influence of temperature on the solution rheology of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide

Lu, Fei; Wang, Lejun; Zhang, Chao; Cheng, Bowen; Liu, Ruigang y; Huang, Yong

doi:10.1007/s10570-015-0740-x

Cited by 26 publications

(28 citation statements)

References 52 publications

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“…At the highest achievable angular frequencies, the values of both modulus are similar, and their slope is approximately 0.5. Such a shape of the mechanical spectrum is characteristic for unentangled polymer solutions (Lu et al 2015). A difference is noted in the relation between G 0 and G 00 as a function of angular frequency in the sodium carboxymethylcellulose solutions with DS values equal to 0.62 and 0.79.…”

Section: Dynamic Rheological Propertiesmentioning

confidence: 91%

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

2017

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The linear dynamic viscoelastic properties and non-linear transient rheology of sodium carboxymethylcellulose solutions (Na-CMC) in propylene glycol/water mixtures were investigated. Measurements were carried out for the solutions of Na-CMC with three different degrees of substitution (DS), namely 0.62, 0.79, 1.04, and the similar average molecular weight (M w & 250,000 g/mol). The strong synergism between the molecules of Na-CMC with DS of 0.62 and 0.79, and propylene glycol has been observed. The occurrence of the overshoot shear stress and the low loss tangent values indicate the physical cross-linking of the polymer chains. The increase of propylene glycol concentration over 80 wt% and sodium carboxymethylcellulose (DS = 0.7) over 1.6 wt% leads to the formation of a physical cross-link network. The absence of overshoot shear stress and terminal behaviour in SAOS flow of the Na-CMC 1.04 solutions in the PG/water mixture shows that no intermolecular cross-linking of polymer chains occurred in them.

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Section: Dynamic Rheological Propertiesmentioning

confidence: 91%

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

2017

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“…When C < C*, the system is in dilute solution, and the intermolecular interaction can be ignored;When C > C*, the intermolecular interaction is enhanced and macromolecular networks are formed. [38,39] The rheological properties of lignin/[C 4 min]Cl aqueous solution highly depends on the temperature. Arrhenius equation is used to evaluate the effect of temperature on viscosity.…”

Section: Effects Of Temperature On the Rheological Behaviormentioning

confidence: 99%

Rheological Characterization of Mixed Aqueous Solutions of Enzymatic Hydrolysis Lignin and Ionic Liquid

Zheng

et al. 2022

ChemistrySelect

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Here we present a rheological study of enzymatic hydrolysis lignin (EH lignin) in 1-butyl-3-methylimidazolium chloride ([C 4 min]Cl) aqueous solutions. The effects of ionic liquid mass fraction, shear rate and temperature on the viscosity and macromolecular chain configuration of EH lignin / C 4 min] Cl aqueous solution were studied. The results showed that the viscosity of the aqueous solutions increased with the increase of lignin content. The mass percentages of overlapping and winding, responding to divisions of lignin macromolecules existence state, were varied with changing in the temperature and mass percentages of ionic liquid. Increasing the mass of ionic liquid will significantly change the viscosity of lignin solution. Most of the lignin solutions had shear thinning behavior, suggesting that macromolecular chains of lignin moved with orientation to the fluid, and disentangled under the shear force. The viscosity of lignin solution decreased with the increase of temperature, and the viscosity activation energy increased with the increase of lignin or ionic liquid mass fraction.

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“…Similar dependence of viscosity and conductivity of cellulose/IL/MS mixtures and the wt% of maximum dissolved cellulose on IL concentration were also observed for AlMeImCl in DMSO [ 87 ]. The rheological properties of cellulose/IL/MS mixtures (mostly DMSO as MS) were studied extensively and data regarding viscosity of these solutions are readily available in the literature [ 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 ]. The comparison and evaluation of the results is not straightforward because there is no common experimental “protocol” for cellulose dissolution (cellulose type, temperature, IL/MS ratio).…”

Section: Mechanism Of Cellulose Dissolution By Neat Qaes Their Somentioning

confidence: 99%

Recent Advances in Solvents for the Dissolution, Shaping and Derivatization of Cellulose: Quaternary Ammonium Electrolytes and their Solutions in Water and Molecular Solvents

et al. 2018

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There is a sustained interest in developing solvents for physically dissolving cellulose, i.e., without covalent bond formation. The use of ionic liquids, ILs, has generated much interest because of their structural versatility that results in efficiency as cellulose solvents. Despite some limitations, imidazole-based ILs have received most of the scientific community’s attention. The objective of the present review is to show the advantages of using quaternary ammonium electrolytes, QAEs, including salts of super bases, as solvents for cellulose dissolution, shaping, and derivatization, and as a result, increase the interest in further investigation of these important solvents. QAEs share with ILs structural versatility; many are liquids at room temperature or are soluble in water and molecular solvents (MSs), in particular dimethyl sulfoxide. In this review we first give a historical background on the use of QAEs in cellulose chemistry, and then discuss the common, relatively simple strategies for their synthesis. We discuss the mechanism of cellulose dissolution by QAEs, neat or as solutions in MSs and water, with emphasis on the relevance to cellulose dissolution efficiency of the charge and structure of the cation and. We then discuss the use of cellulose solutions in these solvents for its derivatization under homogeneous and heterogeneous conditions. The products of interest are cellulose esters and ethers; our emphasis is on the role of solvent and possible side reactions. The final part is concerned with the use of cellulose dopes in these solvents for its shaping as fibers, a field with potential commercial application.

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Influence of temperature on the solution rheology of cellulose in 1-ethyl-3-methylimidazolium chloride/dimethyl sulfoxide

Cited by 26 publications

References 52 publications

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Effect of the degree of substitution on the rheology of sodium carboxymethylcellulose solutions in propylene glycol/water mixtures

Rheological Characterization of Mixed Aqueous Solutions of Enzymatic Hydrolysis Lignin and Ionic Liquid

Recent Advances in Solvents for the Dissolution, Shaping and Derivatization of Cellulose: Quaternary Ammonium Electrolytes and their Solutions in Water and Molecular Solvents

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