Rheology and microstructure of concentrated microcrystalline cellulose (MCC)/1-allyl-3-methylimidazolium chloride (AmimCl)/water mixtures

Rajeev, Ashna; Deshpande, Abhijit P.; Basavaraj, Madivala G.

doi:10.1039/c8sm01448e

Cited by 11 publications

(37 citation statements)

References 61 publications

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“…In this study, the structure and crystallinity of regenerated cellulose fibers are regarded as cellulose II crystalline. The change in crystallography indicates the cleavage of initial intermolecular hydrogen bonds in cellulose in the AMIMCl solutions, ultimately leading to the dissolution of cellulose as a viscose [ 40 ]. As mentioned above, the dissolution and regeneration of cellulose in this work can be described in Figure 1 .…”

Section: Resultsmentioning

confidence: 99%

Strength Enhancement of Regenerated Cellulose Fibers by Adjustment of Hydrogen Bond Distribution in Ionic Liquid

Xue

Yang

et al. 2022

Polymers

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To improve the physical strength of regenerated cellulose fibers, cellulose dissolution was analyzed with a conductor-like screening model for real solvents in which 1-allyl-3-methylimidazolium chloride (AMIMCl) worked only as a hydrogen bond acceptor while dissolving the cellulose. This process could be promoted by the addition of urea, glycerol, and choline chloride. The dissolution and regeneration of cellulose was achieved through dry-jet and wet-spinning. The results demonstrated that the addition of hydrogen bond donors and acceptors either on their own or in combination can enhance the tensile strength, but their effects on the crystallinity of the regenerated fibers were quite limited. Compared with the regenerated fibers without any additives, the tensile strength was improved from 54.43 MPa to 139.62 MPa after introducing the choline chloride and glycerol, while related the crystallinity was only changed from 60.06% to 62.97%. By contrast, a more compact structure and fewer pores on the fiber surface were identified in samples with additives along with well-preserved cellulose frameworks. Besides, it should be noted that an optimization in the overall thermal stability was obtained in samples with additives. The significant effect of regenerated cellulose with the addition of glycerol was attributed to the reduction of cellulose damage by slowing down the dissolution and cross-linking in the cellulose viscose. The enhancement of the physical strength of regenerated cellulose fiber can be realized by the appropriate adjustment of the hydrogen bond distribution in the ionic liquid system with additives.

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Section: Resultsmentioning

confidence: 99%

Strength Enhancement of Regenerated Cellulose Fibers by Adjustment of Hydrogen Bond Distribution in Ionic Liquid

Xue

Yang

et al. 2022

Polymers

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“…With the increase of temperature, the intersection point moved toward the high-frequency area, where modulus transposition occurs, and the sample experienced structure reconstruction and an elasticity larger than the viscosity, which are typical characteristics of an entangled polymer solution. Under the same oscillation frequency, when the temperature increased, G' and G" decreased, which indicated that the viscoelasticity decreased [54][55][56].…”

Section: Thermal Analysismentioning

confidence: 93%

High-Strength Regenerated Cellulose Fiber Reinforced with Cellulose Nanofibril and Nanosilica

Xue

Lin

et al. 2021

Nanomaterials

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In this study, a novel type of high-strength regenerated cellulose composite fiber reinforced with cellulose nanofibrils (CNFs) and nanosilica (nano-SiO2) was prepared. Adding 1% CNF and 1% nano-SiO2 to pulp/AMIMCl improved the tensile strength of the composite cellulose by 47.46%. The surface of the regenerated fiber exhibited a scaly structure with pores, which could be reduced by adding CNF and nano-SiO2, resulting in the enhancement of physical strength of regenerated fibers. The cellulose/AMIMCl mixture with or without the addition of nanomaterials performed as shear thinning fluids, also known as “pseudoplastic” fluids. Increasing the temperature lowered the viscosity. The yield stress and viscosity sequences were as follows: RCF-CNF2 > RCF-CNF2-SiO22 > RCF-SiO22 > RCF > RCF-CNF1-SiO21. Under the same oscillation frequency, G’ and G” decreased with the increase of temperature, which indicated a reduction in viscoelasticity. A preferred cellulose/AMIMCl mixture was obtained with the addition of 1% CNF and 1% nano-SiO2, by which the viscosity and shear stress of the adhesive were significantly reduced at 80 °C.

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“…This has been experimentally verified for solutions of several polymers, including cellulose. ,,− Moreover, the generation of an anisotropic phase by this route, in principle, is not solvent specific. The poor solvent quality can be achieved by manipulating temperature or using a suitable antisolvent. , Recently, we have shown the formation of anisotropic gels in cellulose/IL mixtures with the addition of water . At low concentration of cellulose (5 and 7 wt %) in the ILs, LC domains are observed to form with an increase in the concentration of water (antisolvent).…”

Section: Introductionmentioning

confidence: 99%

“…At low concentration of cellulose (5 and 7 wt %) in the ILs, LC domains are observed to form with an increase in the concentration of water (antisolvent). Whereas, superior mechanical properties are observed only at higher concentrations of cellulose (at 15 and 20 wt %), with the formation of a scale-invariant, self-similar gel of space spanning network of spherulitelike morphology . The formation of a spherulitic network at high cellulose concentration has been hypothesized to be because of the increased probability of local aggregation of cellulose chains causing more compact spherulitelike structures.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Particle-Induced Microstructural Transition in Cellulose/Ionic Liquid/Water Mixtures

Rajeev

Basavaraj

2019

Langmuir

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The role of colloidal particles in enhancing the mechanical and thermal properties of liquid crystalline (LC) gels formed in microcrystalline cellulose/1-allyl-3-methylimidazolium chloride/water mixtures is experimentally investigated by means of rheology and polarized optical microscopy (POM). The overshoot in loss modulus and increase in the melting temperature of LC domains as observed in differential scanning calorimetry signal a stronger interaction of cellulose with both hydrophobic polystyrene and hydrophilic silica nanoparticles which in turn point to considerable amphiphilic nature of cellulose. The aggregation of nanoparticles observed by POM and the rheological behavior point to the development of a sample-spanning network of cellulose− nanoparticle clusters during the sol−gel transition with an increase in concentration of water. Furthermore, the LC gels obey Chambon−Winter (CW) criterion, indicating a self-similar gel network, except at very high particle loadings. Moreover, the LC domains show a temporal evolution into a space-spanning network of cellulose spherulites. The evolution process largely depends on the particle concentration, with highly loaded samples showing quicker evolution, which leads to a violation of the CW criterion. Furthermore, the temperature-induced microstructural transition (with and without shear) is also examined.

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Rheology and microstructure of concentrated microcrystalline cellulose (MCC)/1-allyl-3-methylimidazolium chloride (AmimCl)/water mixtures

Cited by 11 publications

References 61 publications

Strength Enhancement of Regenerated Cellulose Fibers by Adjustment of Hydrogen Bond Distribution in Ionic Liquid

Strength Enhancement of Regenerated Cellulose Fibers by Adjustment of Hydrogen Bond Distribution in Ionic Liquid

High-Strength Regenerated Cellulose Fiber Reinforced with Cellulose Nanofibril and Nanosilica

Colloidal Particle-Induced Microstructural Transition in Cellulose/Ionic Liquid/Water Mixtures

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