A new method to visualize and characterize the pore structure of TENCEL® (Lyocell) and other man‐made cellulosic fibres using a fluorescent dye molecular probe

Abu-Rous, Mohammad; Varga, Ksenija; Bechtold, Thomas; Schuster, K. Christian

doi:10.1002/app.26722

Cited by 39 publications

(22 citation statements)

References 16 publications

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“…The lyocell fiber used here was manufactured with a regenerating bath containing N‐Methylmorpholine N‐oxide (NMMO) and water. Abu‐Rous and coworkers observed the cross section of a similar type lyocell fiber using transmission electron microscopy, where the fiber cross section contained a compact core, a porous middle zone, and a semipermeable fiber skin. The cellulose dissolution and the ultimate mechanical properties of the lyocell ACCs were solely dependent on the structure of these lyocell fibers.…”

Section: Resultsmentioning

confidence: 99%

Effect of the dissolution time on the structure and properties of lyocell‐fabric‐based all‐cellulose composite laminates

Adak

Mukhopadhyay

2016

J of Applied Polymer Sci

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In this study, all-cellulose composite laminates were prepared from lyocell fabric with ionic liquid (1-butyl-3-methyl imidazolium chloride), a conventional hand layup method, and compression molding. Eight layers of lyocell fabric, which were impregnated with ionic liquid, were stacked symmetrically and hot-pressed under compression molding for various times; this resulted in the partial dissolution of the surface of the lyocell fibers. The dissolved cellulose held the laminas together and resulted in a consolidated laminate. Finally, the prepared laminate was impregnated in water to remove the ionic liquid and to regenerate a matrix phase in situ; this was followed by hot-press drying. Optical microscopy and scanning electron microscopy studies were used to analyze composite structures. With increasing dissolution time, the void content in the composites decreased, and the interlaminar adhesion improved. For LC-2h and LC-3h, the highest tensile strength and modulus values obtained were 48.

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Section: Resultsmentioning

confidence: 99%

Effect of the dissolution time on the structure and properties of lyocell‐fabric‐based all‐cellulose composite laminates

Adak

Mukhopadhyay

2016

J of Applied Polymer Sci

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“…Only few of the recorded spectra (like Tencel 1 in Fig. 4) were similar to pure cellulose-based fiber as lyocell ought to be [30][31][32]. Most of the spectra contained in addition to lyocell bands (~ 3500, ~ 3460, ~ 1130 cm −1 ) also N-H stretching absorbances (~ 3330 cm −1 ) and amide C=O stretching bands at ~ 1660 cm −1 , better seen in Fig.…”

Section: Reflectance Spectra Of Different Single-component Textile Fimentioning

confidence: 99%

Reflectance FT-IR spectroscopy as a viable option for textile fiber identification

et al. 2019

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In this study, the reflectance-FT-IR (r-FT-IR) spectroscopy is demonstrated to be a suitable option for non-invasive identification of textile fibers. A collection of known textile fibers, 61 single-component textiles from 16 different types, were analyzed, resulting in more than 4000 individual spectra. The r-FT-IR method was compared with ATR-FT-IR spectroscopy using two instrumental approaches: FT-IR-microspectrometer with ATR mode (mATR-FT-IR) and ATR-FT-IR spectrometer (ATR-FT-IR). Advantages and drawbacks of these methods were discussed. Principal component based discriminant analysis and random forest classification methods were created for the identification of textile fibers in case-study samples. It was concluded that in general, the performance of r-FT-IR is comparable with ATR-FT-IR. In particular, r-FT-IR is more successful than ATR-FT-IR in differentiating between the amide-based fibers wool, silk and polyamide. As an additional result of this work, a collection of r-FT-IR spectra of different textile fibers was compiled and made available for the scientific community.

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“…Pores or voids are present in these fibres and were also shown to be elongated in the fibre direction [7,8]. Abu-Rous et al [9,10] showed that regenerated cellulose fibres contain only nanopores in the core of the fibre and a very porous skin layer. The structure of regenerated cellulose fibres is dependant of various parameters as the initial cellulose solution, the composition and the temperature of the aqueous regeneration bath and the spinning conditions [11,12].…”

Section: Introductionmentioning

confidence: 99%

Restricted dissolution and derivatization capacities of cellulose fibres under uniaxial elongational stress

Moigne¹,

Spinu²,

Heinze³

et al. 2010

Polymer

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The authors are grateful to the publisher, Elsevier, for letting the manuscript being archived in this Open Access repository. The final publication is available at http://www.sciencedirect.com/International audienceCellulose is a future major source of materials and biofuel but its extraction and its chemical or enzymatic treatments are difficult, polluting and inefficient tasks. The accessibility of the reagents to cellulose chains is indeed limited. Classical evocated reasons for this lack of accessibility are pore structure, tight hydrogen bond arrays, crystallinity and presence of resistant materials like lignin. Studying dissolution of cotton hairs and regenerated cellulose fibres in various solvents under uniaxial tension, we found that tension is preventing these fibres to dissolve in chemicals that would dissolve the same cellulose fibres tension-free. We show that what is controlling dissolution is not the degree of swelling since, at the same degree of swelling, fibres under tension do not dissolve while fibres without tension do. An important result is that when a fibre under tension (thus swollen but not dissolved) is breaking, it is immediately dissolving. Under tension, when the solvent is present around cellulose chains, it is activated to solvate the chains only when tension stress is released. A chemical reaction like acetylation of cellulose fibre under tension also gives an interesting result. The degree of substitution remains very low while the same experiment performed without tension leads to higher degree of substitution followed by the dissolution of the fibre (even increasing further the DS due to homogeneous reaction). We postulate that the lack of dissolution capacity or reacting activity under tension can be due to the hampering of local conformational movements, cellulose chains being not able to perform axial movements. The availability of performing local conformational movements could be a main component of cellulose activation

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A new method to visualize and characterize the pore structure of TENCEL® (Lyocell) and other man‐made cellulosic fibres using a fluorescent dye molecular probe

Cited by 39 publications

References 16 publications

Effect of the dissolution time on the structure and properties of lyocell‐fabric‐based all‐cellulose composite laminates

Effect of the dissolution time on the structure and properties of lyocell‐fabric‐based all‐cellulose composite laminates

Reflectance FT-IR spectroscopy as a viable option for textile fiber identification

Restricted dissolution and derivatization capacities of cellulose fibres under uniaxial elongational stress

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