Anisotropy of the modulus of elasticity in regenerated cellulose fibres related to molecular orientation

Gindl, Wolfgang; Reifferscheid, Moritz; Adusumalli, Ramesh Babu; Weber, Hedda K.; Röder, Thomas; Sixta, Herbert; Schöberl, Thomas

doi:10.1016/j.polymer.2007.12.016

Cited by 69 publications

(41 citation statements)

References 40 publications

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“…Indeed, resilience (Fig. S4) was found to be largely constant at 1.10 ± 0.32 MJ m -3 , which is very similar to Lyocell (0.8-1.6 MJ m -3 ) (Gindl et al 2008a). D R 12.5 filaments had a higher limit of 1.25 ± 0.24 % and a correspondingly higher resilience of 1.39 ± 0.78 MJ m -3 , but due to the scatter-again probably because of damage-this is not statistically significant.…”

Section: Tenacity and Modulusmentioning

confidence: 59%

Dry jet-wet spinning of strong cellulose filaments from ionic liquid solution

et al. 2014

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Considerable growth is expected in the production of man-made cellulose textile fibers, which are commercially produced either via derivatization to form cellulose xanthate (viscose) or via direct dissolution in N-methylmorpholine N-oxide (Lyocell). In the study at hand, cellulosic fibers are spun from a solution in the ionic liquid [DBNH] [OAc] into water, resulting in properties equal or better than Lyocell (tensile strength 37 cN tex -1 or 550 MPa). Spinning stability is explored, and the effects of extrusion velocity, draw ratio, spinneret aspect ratio and bath temperature on mechanical properties and orientation are discussed. With the given set-up, tenacities and moduli are improved with higher draw ratios, while elongation at break, the ratio of wet to dry strength, modulus of resilience and birefringence depend little on draw ratio or extrusion velocity, elastic limit not at all. We find the process robust and simple, with stretching to a draw ratio of 5 effecting most improvement, explained by the orientation of amorphous domains along the fiber axis.

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Section: Tenacity and Modulusmentioning

confidence: 59%

Dry jet-wet spinning of strong cellulose filaments from ionic liquid solution

et al. 2014

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“…This phenomenon is attributed to the geometry of the indenter because of the inclination of its flanks. 47 It is expected that a uniaxial stress state allowing the calculation of a correct value for the modulus of elasticity will build up under a flat indenter body (flat punch or flat cone).…”

Section: Nanoindentation Measurements With Flattened Conical Indentermentioning

confidence: 99%

Relationship between structure and rheological, mechanical and thermal properties of polylactide/Cloisite 30B nanocomposites

Zaidi

Bruzaud

Bourmaud

et al. 2009

J of Applied Polymer Sci

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Melt-state and solid state mechanical properties and thermal stability of polylactide layered silicate nanocomposites elaborated by melt intercalation were studied as a function of clay content. Wide angle X-ray scattering results, transmission electron microscopy observations, and rheological measurements indicated that the clay was finely distributed in the polylactide matrix. Contrary to nonlinear mechanical properties, thermal and linear mechanical properties were shown to increase with increasing clay fraction. The nanoindentation measurements confirm the significant increase of linear mechanical properties previously observed by tensile tests. The good correlation of linear mechanical properties at the macrometric and nanometric scales is explained by the high dispersion degree of the nanofiller in the biodegradable polymer matrix.

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“…The viscoelastic polymer solution is thus subjected to additional extensional stress, which triggers an orientation of the cellulose molecule chains along the fiber axis [24]. This results in the characteristic high tensile strength of Lyocell fibers that, unlike viscose fibers, remains high even in wet conditions [25,26]. In 2014, the worldwide Lyocell production capacity was expanded to 200,000 tons/ year [4].…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquids for the Production of Man-Made Cellulosic Fibers: Opportunities and Challenges

Hummel

Michud

Tanttu

et al. 2015

Advances in Polymer Science

132

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The constant worldwide increase in consumption of goods will also affect the textile market. The demand for cellulosic textile fibers is predicted to increase at such a rate that by 2030 there will be a considerable shortage, estimated at~15 million tons annually. Currently, man-made cellulosic fibers are produced commercially via the viscose and Lyocell™ processes. Ionic liquids (ILs) have been proposed as alternative solvents to circumvent certain problems associated with these existing processes. We first provide a comprehensive review of the progress in fiber spinning based on ILs over the last decade. A summary of the reports on the preparation of pure cellulosic and composite fibers is complemented by an overview of the rheological characteristics and thermal degradation of cellulose-IL solutions. In the second part, we present a non-imidazolium-based ionic liquid, 1,5-diazabicyclo[4.3.0]non-5-enium acetate, as an excellent solvent for cellulose fiber spinning. The use of moderate process temperatures in this process avoids the otherwise extensive cellulose degradation. The structural and morphological properties of the spun fibers are described, as determined by WAXS, birefringence, and SEM measurements. Mechanical properties are also reported. Further, the suitability of the spun fibers to produce yarns for various textile applications is discussed.

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Anisotropy of the modulus of elasticity in regenerated cellulose fibres related to molecular orientation

Cited by 69 publications

References 40 publications

Dry jet-wet spinning of strong cellulose filaments from ionic liquid solution

Dry jet-wet spinning of strong cellulose filaments from ionic liquid solution

Relationship between structure and rheological, mechanical and thermal properties of polylactide/Cloisite 30B nanocomposites

Ionic Liquids for the Production of Man-Made Cellulosic Fibers: Opportunities and Challenges

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