scholarly journals Superbase-based protic ionic liquids for cellulose filament spinning

Cellulose ◽  
2020 ◽  
Author(s):  
Sherif Elsayed ◽  
Michael Hummel ◽  
Daisuke Sawada ◽  
Chamseddine Guizani ◽  
Marja Rissanen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Mechanical Performance ◽  
Cellulose Fibers ◽  
Fiber Spinning ◽  
Regenerated Cellulose ◽  
Market Demand ◽  
Protic Ionic Liquids ◽  
Rheological Characterization ◽  
Spinning Process

Abstract Lyocell fibers have received increased attention during the recent years. This is due to their high potential to satisfy the rising market demand for cellulose-based textiles in a sustainable way. Typically, this technology adopts a dry-jet wet spinning process, which offers regenerated cellulose fibers of excellent mechanical properties. Compared to the widely exploited viscose process, the lyocell technology fosters an eco-friendly process employing green direct solvents that can be fully recovered with low environmental impact. N-methylmorpholine N-oxide (NMMO) is a widely known direct solvent that has proven its success in commercializing the lyocell process. Its regenerated cellulose fibers exhibit higher tenacities and chain orientation compared to viscose fibers. Recently, protic superbase-based ionic liquids (ILs) have also been found to be suitable solvents for lyocell-type fiber spinning. Similar to NMMO, fibers of high mechanical properties can be spun from the cellulose-IL solutions at lower spinning temperatures. In this article, we study the different aspects of producing regenerated cellulose fibers using NMMO and relevant superbase-based ILs. The selected ILs are 1,5-diazabicyclo[4.3.0]non-5-ene-1-ium acetate ([DBNH]OAc), 7-methyl-1,5,7-triazabicyclo[4.4.0] dec-5-enium acetate ([mTBDH]OAc) and 1,8-diazabicyclo[5.4.0]undec-7-enium acetate ([DBUH]OAc). All ILs were used to dissolve a 13 wt% (PHK) cellulose pulp. The study covers the fiber spinning process, including the rheological characterization of the various cellulose solutions. Moreover, we discuss the properties of the produced fibers such as mechanical performance, macromolecular properties and morphology. Graphic abstract

scholarly journals Conductive Regenerated Cellulose Fibers for Multi-Functional Composites: Mechanical and Structural Investigation

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1746
Author(s):  
Zainab Al-Maqdasi ◽  
Roberts Joffe ◽  
Ayoub Ouarga ◽  
Nazanin Emami ◽  
Shailesh Singh Chouhan ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Structural Integrity ◽  
Mechanical Performance ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Plating Bath ◽  
Model Composite ◽  
Sensing Applications ◽  
Functional Composites

Regenerated cellulose fibers coated with copper via electroless plating process are investigated for their mechanical properties, molecular structure changes, and suitability for use in sensing applications. Mechanical properties are evaluated in terms of tensile stiffness and strength of fiber tows before, during and after the plating process. The effect of the treatment on the molecular structure of fibers is investigated by measuring their thermal stability with differential scanning calorimetry and obtaining Raman spectra of fibers at different stages of the treatment. Results show that the last stage in the electroless process (the plating step) is the most detrimental, causing changes in fibers’ properties. Fibers seem to lose their structural integrity and develop surface defects that result in a substantial loss in their mechanical strength. However, repeating the process more than once or elongating the residence time in the plating bath does not show a further negative effect on the strength but contributes to the increase in the copper coating thickness, and, subsequently, the final stiffness of the tows. Monitoring the changes in resistance values with applied strain on a model composite made of these conductive tows show an excellent correlation between the increase in strain and increase in electrical resistance. These results indicate that these fibers show potential when combined with conventional composites of glass or carbon fibers as structure monitoring devices without largely affecting their mechanical performance.

Research on Mechanical Properties of Several New Regenerated Cellulose Fibers

2011 ◽  
Vol 332-334 ◽  
pp. 489-495 ◽  
Author(s):  
Rong Zhou ◽  
Ming Xia Yang
Keyword(s):  
Mechanical Properties ◽  
Phase Change Materials ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Bast Fiber ◽  
Bamboo Pulp ◽  
Lyocell Fiber

Regenerated cellulose fiber is the most widely-used and most variety of cellulose fiber. Five categories and ten kinds of fibers such as lyocell fiber, modal fiber, bamboo pulp fiber, sheng-bast fiber, Outlast viscose fiber were chosen as the research object. The strength property and elasticity of fibers in dry and wet state were tested and analysis. The comprehensive performances of fabrics were studied and mechanical properties of the fibers were listed in the order from good to bad by grey clustering analysis. The results show lyocell G100 and lyocell LF have better comprehensive mechanical properties ,while other new regenerated cellulose fibers’ comprehensive mechanical properties are general. Among these fibers modal fiber’s comprehensive mechanical properties are slightly better than sheng-bast fibers’ and bamboo pulp fibers’. Modal fiber, sheng-bast fiber and Bamboo pulp fiber have no significantly poor single parameter and all of them have better comprehensive mechanical properties than various viscose fibers. Outlast viscose in which has been added phase change materials sensitive to temperature by Microcapsule techniques fundamentally keeps similar comprehensive mechanical properties with other regenerated cellulose fibers,but its properties decline slightly .

Structure and Mechanical Properties of Regenerated Cellulose Fibers Wet-Spun from Ionic Liquid/Cosolvent Systems

2019 ◽  
Vol 20 (3) ◽  
pp. 501-511
Author(s):  
Young Jae Lee ◽  
Sung Jun Lee ◽  
Sang Won Jeong ◽  
Hyun-chul Kim ◽  
Tae Hwan Oh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Cellulose Fibers ◽  
Regenerated Cellulose

scholarly journals Regenerated Cellulose/Graphene Composite Fibers with Electroconductive Properties

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kulpinski Piotr ◽  
Jeremiasz K. Jeszka ◽  
Malolepszy Artur ◽  
Stobinski Leszek
Keyword(s):  
Graphene Oxide ◽  
Water Solution ◽  
Cellulose Fibers ◽  
Fiber Spinning ◽  
Point Of View ◽  
Regenerated Cellulose ◽  
Fiber Morphology ◽  
Reduced Graphene ◽  
The Difference ◽  
Electronic Elements

AbstractConductive cellulose fibers may find application in producing antistatic materials and fibrous electronic elements for smart textiles (textronics). In this paper, we present a method of fabrication of cellulose fibers modified with the reduced graphene oxide (rGO) and graphene oxide (GO). The fibers were obtained by using N-methylmorpholine-N-oxide (NMMO) as a direct solvent, adding dispersion of GO during the cellulose dissolution process. In the next step, the GO enclosed in the fibers was reduced for ca. half an hour at 90°C with the excess of water solution of hydrazine to obtain fibers containing rGO. The viscosity of the spinning solution increased when GO was added; however, the difference is important at low shearing rates but decreases at high shearing rates, similar to that used in the process of fiber spinning. Cellulose fibers containing 3, 4, 6, and 10% w/w of rGO were obtained. Fiber morphology was studied using electron microscopy. The results of the electrical properties’ measurements showed that the conductivity of modified fibers strongly depends on the concentration of rGO. At 10% rGO conductivity was 9 x 10−3 S/cm. The mechanical properties of the obtained fibers were slightly changed by the presence of GO and rGO. Tenacity and elongation at break decreased with the increase in the content of GO and rGO in the fibers but remain at an acceptable level from the textiles processing point of view.

Influence of Domain Orientation on the Mechanical Properties of Regenerated Cellulose Fibers

2007 ◽  
Vol 8 (2) ◽  
pp. 624-630 ◽  
Author(s):  
Kenny Kong ◽  
Richard J. Davies ◽  
Michael A. McDonald ◽  
Robert J. Young ◽  
Michael A. Wilding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Fibers ◽  
Regenerated Cellulose ◽  
Domain Orientation

scholarly journals Lignin-Based High-Performance Fibers by Textile Spinning Techniques

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3378
Author(s):  
Yanhong Jin ◽  
Jiaxian Lin ◽  
Yu Cheng ◽  
Chunhong Lu
Keyword(s):  
Molecular Weight ◽  
High Performance ◽  
Mechanical Performance ◽  
Direct Conversion ◽  
Industrial Applications ◽  
Fiber Spinning ◽  
Raw Material ◽  
Spinning Process ◽  
Renewable Raw Material ◽  
Modified Lignin

As a major component of lignocellulosic biomass, lignin is one of the largest natural resources of biopolymers and, thus, an abundant and renewable raw material for products, such as high-performance fibers for industrial applications. Direct conversion of lignin has long been investigated, but the fiber spinning process for lignin is difficult and the obtained fibers exhibit unsatisfactory mechanical performance mainly due to the amorphous chemical structure, low molecular weight of lignin, and broad molecular weight distribution. Therefore, different textile spinning techniques, modifications of lignin, and incorporation of lignin into polymers have been and are being developed to increase lignin’s spinnability and compatibility with existing materials to yield fibers with better mechanical performance. This review presents the latest advances in the textile fabrication techniques, modified lignin-based high-performance fibers, and their potential in the enhancement of the mechanical performance.

scholarly journals Strengthening Regenerated Cellulose Fibers Sourced from Recycled Cotton T-Shirt Using Glucaric Acid for Antiplasticization

2021 ◽  
Vol 2 (1) ◽  
pp. 138-153
Author(s):  
Manik Chandra Biswas ◽  
Ryan Dwyer ◽  
Javier Jimenez ◽  
Hsun-Cheng Su ◽  
Ericka Ford
Keyword(s):  
Mechanical Performance ◽  
Tensile Modulus ◽  
Aqueous Sodium Hydroxide ◽  
Cellulose Fibers ◽  
Cotton Fibers ◽  
Regenerated Cellulose ◽  
Acid Neutralization ◽  
Glucaric Acid ◽  
Recycled Pulp ◽  
Direct Dissolution

The recycling of cellulose from cotton textiles would minimize the use of virgin crop fibers, but recycled polymers are generally inferior in mechanical performance to those made from virgin resins. This challenge prompted the investigation of biobased additives that were capable of improving the mechanical properties of fibers by means of antiplasticizing additives. In this study, regenerated cellulose (RC) fibers were spun from cellulose found in cotton T-shirts, and fibers were mechanically strengthened with glucaric acid (GA), a nontoxic product of fermentation. The recycled pulp was activated using aqueous sodium hydroxide and then followed by acid neutralization, prior to the direct dissolution in lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) at 3 wt.% cellulose. At 10% (w/w) GA, the tensile modulus and strength of regenerated cellulose from recycled cotton fibers increased five-fold in contrast to neat fibers without GA. The highest modulus and tenacity values of 664 cN/dtex and of 9.7 cN/dtex were reported for RC fibers containing GA.

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