Dissolution of less-processed wood fibers without bleaching in an ionic liquid: Effect of lignin condensation on wood component dissolution

Regenerated cellulose fibers from bagasse and wood were produced under various processing conditions using the ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCl) as a solvent. Two different ionic liquid solutions were prepared with 6 wt% of bagasse cellulose and 6 wt% of wood cellulose. The solutions were extruded with a dry-jet and wet-spinning method using water as a coagulation bath. A thermogravimetric analyzer (TGA) was used to measure the thermal properties of these regenerated fibers. Dynamic mechanical analysis (DMA) was used to determine the thermal mechanical property of the regenerated cellulose fibers and wide-angle X-ray diffraction (WAXD) was used to measure the degree of crystallinity, as well as the degree of crystal orientation for those experimental fibers. To evaluate the quantity of ionic liquid residue in the regenerated fibers, the instrumental methods of FT-IR and mass spectrometry were applied to test the residues of BMIMCl in the regenerated fibers. Research results indicated increases in the degree of crystallinity and storage modulus under a higher fiber drawing speed. Both regenerated bagasse film and regenerated wood film had similar thermal properties. However, the regenerated bagasse fibers showed a higher degree of crystallinity, and higher tenacity than the regenerated wood fibers obtained under the same condition. The study also revealed that water treatment would be helpful for eliminating the ionic liquid residue in the regenerated fibers.

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Anatomical and Topochemical Aspects of Japanese beech (Fagus crenata) Cell Walls After Treatment with the Ionic Liquid, 1-Ethylpyridinium Bromide

Microscopy and Microanalysis ◽

10.1017/s1431927615015275 ◽

2015 ◽

Vol 21 (6) ◽

pp. 1562-1572 ◽

Cited By ~ 4

Author(s):

Toru Kanbayashi ◽

Hisashi Miyafuji

Keyword(s):

Ionic Liquid ◽

Cell Walls ◽

Middle Lamella ◽

Morphological Characteristics ◽

Fagus Crenata ◽

Cellular Level ◽

Chemical Components ◽

Wood Fibers ◽

High Concentration ◽

Japanese Beech

AbstractChanges in the ultrastructure and chemical components, and their distribution in Japanese beech (Fagus crenata), during the ionic liquid 1-ethylpyridinium bromide ([EtPy][Br]) treatment were examined at the cellular level by light microscopy, scanning electron microscopy, and confocal Raman microscopy. Each of the tissues, including wood fibers, vessels and parenchyma cells treated with [EtPy][Br] showed specific morphological characteristics. Furthermore, lignin can be preferentially liquefied and eluted in [EtPy][Br] from the cell walls when compared to polysaccharides. However, the delignification was heterogeneous on the cell walls as lignin maintained a relatively high-concentration at the compound middle lamella, cell corners, inner surface of the secondary wall, and pits after [EtPy][Br] treatment.

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Photoluminescent synthetic wood fibers from an ionic liquid via electrospinning

Macromolecular Research ◽

10.1007/s13233-011-0416-9 ◽

2011 ◽

Vol 19 (4) ◽

pp. 317-321 ◽

Cited By ~ 12

Author(s):

Tae-Joon Park ◽

Yeon Jae Jung ◽

Hongkwan Park ◽

Sung-Wook Choi ◽

Eunkyoung Kim ◽

...

Keyword(s):

Ionic Liquid ◽

Wood Fibers

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Material pocket dynamic mechanical analysis: a novel tool to study thermal transition in wood fibers plasticized by an ionic liquid (IL)

Holzforschung ◽

10.1515/hf-2014-0080 ◽

2015 ◽

Vol 69 (2) ◽

pp. 223-232 ◽

Cited By ~ 5

Author(s):

Rongxian Ou ◽

Yanjun Xie ◽

Qingwen Wang ◽

Shujuan Sui ◽

Michael P. Wolcott

Keyword(s):

Phase Transition ◽

Ionic Liquid ◽

Dynamic Mechanical Analysis ◽

Wood Flour ◽

Mechanical Analysis ◽

Crystalline Cellulose ◽

Measured Temperature ◽

Wood Fibers ◽

Dynamic Mechanical ◽

Wood Particles

Abstract The investigation of phase transition in powdered materials by dynamic mechanical analysis (DMA) is not straightforward because powders are difficult to prepare in a solid compact form without altering their structure and properties. In this study, a material pocket (MP) method has been applied to provide physical support to powdered samples for DMA testing (MP-DMA). Poplar wood strips and four types of wood particles [native wood flour (WF), α-cellulose (αC), holocellulose (HC), and particles without hemicelluloses (HR)] were treated with an ionic liquid (IL), 1-ethyl-3-methylimidazolium chloride ([Emim]Cl), to a weight percent gain (WPG) of 36%. Results show that all four [Emim]Cl-treated wood particles exhibited three apparent transition peaks over the measured temperature range. Paracrystalline cellulose, hemicelluloses, and lignin all exhibited a glass transition temperature (Tg) at approximately 85°C due to the plasticizing effect of [Emim]Cl. The transition peak at a higher temperature may be due to the melting of crystalline cellulose in [Emim]Cl. MP-DMA is an effective tool for direct monitoring the phase transition of powdered lignocellulosics. This provides new insight into the interactions of ILs and cell wall polymers, and the method established can be easily extended to other systems based on powdered samples.

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Improved Acetylation Efficacy of Wood Fibers by Ionic Liquid Pretreatment

BioResources ◽

10.15376/biores.12.1.684-695 ◽

2016 ◽

Vol 12 (1) ◽

Cited By ~ 2

Author(s):

Xiaoping Shen ◽

Yanjun Xie ◽

Qingwen Wang

Keyword(s):

Ionic Liquid ◽

Wood Fibers ◽

Ionic Liquid Pretreatment

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Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

Journal of Materials Chemistry C ◽

10.1039/d0tc03334k ◽

2020 ◽

Vol 8 (38) ◽

pp. 13368-13374

Author(s):

Muhammad Umair Khan ◽

Gul Hassan ◽

Jinho Bae

Keyword(s):

Ionic Liquid ◽

Acrylic Acid ◽

Sodium Hydroxide ◽

Sodium Salt ◽

Resistive Memory ◽

Cylindrical Microchannel ◽

Memory Characteristics ◽

Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

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