Effect of rheological factors on the length of liquid threads

Ziabicki, Andrzej; Takserman-Krozer, R.

doi:10.1007/bf01499686

Cited by 21 publications

(7 citation statements)

References 5 publications

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“…The extent of the stretch depends on different physical and chemical parameters, which play a role when transforming a fluid filament to solid spun fibers. The viscoelastic properties of the spinning solutions must be in a defined range to reach an optimum spinnability. − The acetylated spinning dopes showed zero-shear viscosities that were outside the optimum range found in our previous studies using pure cellulose solutions. , The dope corresponding to DS 0.75 also had a very low dynamic modulus at the COP, which is indicative for both broadening the molecular mass distribution and lowering the stiffness/hardness or resistance to deformation. Nonetheless, the solutions showed good spinnability (Table ), which has been defined by the maximum draw ratio (DR) that allows still for stable spinning conditions.…”

Section: Results and Discussionmentioning

confidence: 79%

High-Performance Acetylated Ioncell-F Fibers with Low Degree of Substitution

Asaadi

Kakko

King

et al. 2018

ACS Sustainable Chem. Eng.

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Cellulose acetate is one of the most important cellulose derivatives. Herein we present a method to access cellulose acetate with a low degree of substitution through a homogeneous reaction in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH][OAc]). This ionic liquid has also been identified as an excellent cellulose solvent for dry-jet wet fiber spinning. Cellulose was dissolved in [DBNH][OAc] and esterified in situ to be immediately spun into modified cellulose filaments with a degree of substitution (DS) value of 0.05–0.75. The structural properties of the resulting fibers, which are characterized by particularly high tensile strength values (525–750 MPa conditioned and 315–615 MPa wet) and elastic moduli between 10–26 GPa, were investigated by birefringence measurements, wide-angle X-ray scattering, and molar mass distribution techniques while their unique interactions with water have been studied through dynamic vapor sorption. Thus, an understanding of the novel process is gained, and the advantages are demonstrated for producing high-value products such as textiles, biocomposites, filters, and membranes.

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Section: Results and Discussionmentioning

confidence: 79%

High-Performance Acetylated Ioncell-F Fibers with Low Degree of Substitution

Asaadi

Kakko

King

et al. 2018

ACS Sustainable Chem. Eng.

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“…In addition to the previous types, cohesive fractures can take place when the tensile stress in the viscoelastic solution exceeds the critical tensile strength. An increase in tensile stress can be a result of a small filament diameter, high godet speed or high spinning temperatures (Ziabicki & Takserman-Krozer 1964a;Ziabicki & Takserman-Krozer 1964b).…”

Section: Dry-jet Wet Spinningmentioning

confidence: 99%

Limitations of Cellulose Dissolution and Fiber Spinning in the Lyocell Process Using [mTBDH][OAc] and [DBNH][OAc] Solvents

Elsayed

Viard

Guizani

et al. 2020

Ind. Eng. Chem. Res.

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for the coffee breaks and the after-work chats. To my family, Simone you were my additional motive. Your help and support in my last year have been priceless. Thank you, Magdy, my dear father and brother, for your love and support. Finally, to my mother, you are the first person I think of whenever I want to share something. I still talk to you, and you still listen. Mother, although you have departed from this world, in my heart you always live.

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“…In 1964, Ziabicki et al already concluded that any liquid can be drawn to filaments if appropriate process conditions are applied (Ziabicki & Takserman-Krozer 1964a). This hypothesis indicates that only two major factors limit the length of a filament, among them cohesion and capillary break.…”

Section: Factors Influencing the Spinning Processmentioning

confidence: 99%

“…When filaments are extruded, the polymer chains pre-orientate in the spinneret, and further align once stretched in the air-gap (Fink et al 2001). The success of this process again depends on the spinning temperature and the cellulose concentration employed as the liquid thread requires to withstand the forces created by the spinning process during extrusion (Ziabicki & Takserman-Krozer 1964a;Ziabicki & Takserman-Krozer 1964b). Therefore, lower concentrations (cf.…”

Section: Spin Dope Rheologymentioning

confidence: 99%