Structure–property relations in regenerated cellulose fibers: comparison of fibers manufactured using viscose and lyocell processes

Sharma, Aakash; Nagarkar, Shailesh; Thakre, Shirish; Kumaraswamy, Guruswamy

doi:10.1007/s10570-019-02352-w

Cited by 45 publications

(30 citation statements)

References 44 publications

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“…This result was very different from the viscose system, in which the cavity was inevitable because of the release of toxic gases such as CS 2 generated from the chemical process involved. 9,52 On the contrary, the release of CO 2 in the current system did not create any cavity. Further investigation is necessary to elucidate this result.…”

Section: ■ Results and Discussionmentioning

confidence: 65%

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Development of an effective, nontoxic, and easy-to-process novel cellulose dissolution system for the preparation of regenerated cellulose fibers is of great importance and necessity for a greener and more sustainable future, with which the traditional viscose process with serious pollution can be gradually substituted. Herein, we demonstrated the successful utilization of a CO2 switchable solvent, a novel cellulose derivative dissolution system resembling viscose but without releasing toxic gases such as CS2 and H2S, for the preparation of regenerated cellulose fibers. The corncob cellulose raw material can be readily dissolved completely after the capture of CO2 in dimethyl sulfoxide (DMSO) with 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), resulting in cellulose spinning dope with high stability. Results showed that regenerated cellulose fibers with smoother surface morphology, a higher degree of crystallinity, and satisfactory mechanical properties were obtained under mild conditions with relatively slower double diffusion. Moreover, drawing treatment further increased the degree of crystallinity and orientation and the mechanical properties. All fibers had a dense structure, circular cross sections, no fibrillation, and high thermal stability. The regenerated cellulose fibers had degrees of crystallinity and orientation and tensile strength of 75.3%, 0.82, and 1.05 cN/dtex and 68.4%, 0.82, and 1.00 cN/dtex, respectively, in water and 30 vol % DMSO coagulation baths with a drawing ratio of 2.0 and 1.5, respectively. This work illustrated that the CO2 switchable solvent, which could be considered as “green viscose”, is a good candidate with great potential for the preparation of regenerated cellulose fibers with high performance and various functionalities in the future.

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Section: ■ Results and Discussionmentioning

confidence: 65%

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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“…Fiber structural characteristics, such as crystallinity, crystal orientation and anisotropy of amorphous domains, that can be partly tuned by process parameters (Asaadi et al, 2018), are considered to significantly affect their mechanical properties (Sharma et al, 2019). By crystallinity we here mean the overall fraction, from zero to one, of the material that is crystalline, as opposed to amorphous.…”

Section: Introductionmentioning

confidence: 99%

A novel X-ray diffraction approach to assess the crystallinity of regenerated cellulose fibers

Gentile¹,

Sixta²,

Giannini³

et al. 2022

Int Union Crystallogr J

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Here, a new accurate approach is presented to quantify the degree of crystallinity of regenerated cellulose textile fibers using wide-angle X-ray scattering. The approach is based on the observation that the contributions to the scattering from crystalline and amorphous domains of the fibers can be separated due to their different degree of orientation with respect to the fiber direction. The method is tested on Ioncell-F fibers, dry jet wet spun with different draw ratios from an ionic liquid solution. The analysis output includes, apart from an accurate estimate of the fiber crystallinity, the degrees of orientation of the cellulose nanocrystals and the cellulose chains in the amorphous domains.

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“…[8] For these types of fibers, mainly wood-based pulps are either dissolved (lyocell process) or derivatized (viscose process), followed by spinning into a re-precipitation bath. [9,10] An advantage of continuous filaments obtained from this process compared to natural fibers is that it is possible to predefine and engineer their properties by adjusting the production parameters. Either flexible and bulky or stiff and high-strength fibers can be formed by changing parameters such as the degree of polymerization (DP) of the cellulosic spinning solution, [11] the air gap between the spinneret and the bath, [12] the coagulation speed, [13] or the draw ratio.…”

Section: Introductionmentioning

confidence: 99%

Influence of yarn structure and coating on the mechanical performance of continuous viscose fiber/epoxy composites

et al. 2021

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The present study investigated the effect of selected structural parameters on the mechanical performance of regenerated cellulose composites. The experimental setup comprised continuous viscose (rayon) yarns embedded in a matrix of epoxy resin. Mechanical and microscopic characterizations involved comparing the following: yarns consisting of untwisted filaments and twisted warp and weft yarns taken from a plain weave fabric, yarns with and without avivage (fiber finish), as well as yarns with and without an acrylic coating. During the epoxy treatment, samples were either prestressed or laid horizontally to preserve the original yarn structure. Tensile tests revealed that yarn crimp had a significant impact on the strength properties of composite specimens, a higher crimp ratio leading to a decrease in performance. Applying prestress to crimped yarns has proven to be an effective way to enable straight alignment in the loading direction, which is essential for the design of stiffness-and strength-optimized yarn composites. Unlike an avivage, which did not markedly affect the mechanical properties of composite yarns, the application of an acrylic coating prior to resin impregnation was found to provide significantly increased extensibility and more ductile fracture behavior.

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Structure–property relations in regenerated cellulose fibers: comparison of fibers manufactured using viscose and lyocell processes

Cited by 45 publications

References 44 publications

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent

A novel X-ray diffraction approach to assess the crystallinity of regenerated cellulose fibers

Influence of yarn structure and coating on the mechanical performance of continuous viscose fiber/epoxy composites

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Structure–property relations in regenerated cellulose fibers: comparison of fibers manufactured using viscose and lyocell processes

Cited by 45 publications

References 44 publications

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO2 Switchable Solvent

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO2 Switchable Solvent

A novel X-ray diffraction approach to assess the crystallinity of regenerated cellulose fibers

Influence of yarn structure and coating on the mechanical performance of continuous viscose fiber/epoxy composites

Contact Info

Product

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Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent

Structure and Properties of Regenerated Cellulose Fibers Based on Dissolution of Cellulose in a CO₂ Switchable Solvent