Air-gap spinning of cellulose/ionic liquid solution and its characterization

Hong, Joo Hyung; Ku, Min Kyung; Ahn, Yongjun; Kim, Hyung Joo; Kim, Hyungsup

doi:10.1007/s12221-013-2015-1

Cited by 12 publications

(2 citation statements)

References 17 publications

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“…Hong et al demonstrated that in highly concentrated solution the enhanced proximity of solute molecules promotes tight packing during the spinning and coagulation process. This led to the formation of a higher degree of order of the cellulose molecules in the resulting fiber (Hong et al 2013). Hence, the concentration of HPG-pulp in the dope was increased up to 15 wt% to observe the change in mechanical properties of the fiber.…”

Section: Resultsmentioning

confidence: 99%

Towards regenerated cellulose fibers with high toughness

et al. 2021

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The production of sustainable and high-performance fabrics requires high mechanical strength of the individual (staple) fibers. Although Ioncell fibers already exhibit higher fiber strength than commercial man-made cellulose fibers or cotton fibers, we further aimed to increase both strength and toughness to gradually approach synthetic fibers in these properties. Decisive factors for the achievable mechanical properties of the fibers were the pulp purity, the cellulose concentration in the spinning solution and length-to-diameter (L/D) ratio of the cylindrical part of the spinneret. The absence of low molecular weight fractions in combination with an increased average molecular weight had the highest impact on the achievement of both high strength and toughness. Using a spinneret with a high L/D ratio, it was possible to spin Ioncell fibers with a tensile strength of 925 MPa (61.5 cN/tex) and a modulus of toughness of 83.3 MPa (55.5 J/g). According to a fluid dynamic simulation, uniformly longer molecular cellulose chains in combination with a longer cylindrical capillary promoted an effective alignment of the cellulose molecules inside the spinneret capillary before entering the airgap, thus creating the conditions for a simultaneous increase in tensile strength and elongation i.e. toughness of the fiber. Mechanistically, high fiber toughness is caused by the structural parameters in longitudinal direction, in particular by a higher tilt angle, a longer periodicity of the lamellar plane and lower micro void orientation. In summary, we have developed lyocell-type fibers with high strength and toughness, which can potentially be used as a surrogate for synthetic fibers. Graphic abstract

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Section: Resultsmentioning

confidence: 99%

Towards regenerated cellulose fibers with high toughness

et al. 2021

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“…The regenerated bagasse fibers had higher crystallinity and tenacity than the regenerated wood fibers. Hong et al (2013) prepared cellulose fibers using cellulose/ [Emim]OAc: dimethylformamide (DMF) solution under dry-jet-wet spinning conditions. The presence of DMF decreased the solution viscosity and improved spinnability and the fiber surface, but it led to a reduced crystallinity and tensile strength of the fibers.…”

Section: Dry-jet-wet Spinningmentioning

confidence: 99%

Cellulose-based fiber spinning processes using ionic liquids

et al. 2022

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Cellulose, a natural, renewable, and environment friendly biopolymer, has been considered as a sustainable feedstock in the near future. However, only 0.3% of cellulose is today processed since it is not soluble in conventional solvents due to the strong hydrogen bonding network and highly ordered structure. Hence, the search of effective and eco-friendly solvents for cellulose dissolution has been a key pillar for decades. In the recent years, ionic liquids (ILs) have been proposed as green solvents for cellulose and have been applied for the production of cellulose-based fibers. This review aims to focus the attention toward fiber spinning methods of cellulose based on ILs, as well as recent progress in cellulose dissolution using ILs. Moreover, the development of cellulosic fibers blended with other biopolymers, and cellulose composites are presented. Finally, different applications of cellulose fibers and composites are summarized and discussed.

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Direct transfer of CVD-grown graphene onto eco-friendly cellulose film for highly sensitive gas sensor

Kim

Lee

et al. 2019

Cellulose

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Air-gap spinning of cellulose/ionic liquid solution and its characterization

Cited by 12 publications

References 17 publications

Towards regenerated cellulose fibers with high toughness

Towards regenerated cellulose fibers with high toughness

Cellulose-based fiber spinning processes using ionic liquids

Direct transfer of CVD-grown graphene onto eco-friendly cellulose film for highly sensitive gas sensor

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