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

Asaadi, Shirin; Kakko, Tia; King, Alistair W. T.; Kilpeläinen, Ilkka; Hummel, Michael; Sixta, Herbert

doi:10.1021/acssuschemeng.8b01768

Cited by 34 publications

(43 citation statements)

References 64 publications

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“…This efficiency is remarkable for a bulk solvent-free and heterogeneous reaction (but still containing significant surface water). It is significantly higher than the solvent-based acetylation of cellulose with N-acetylimidazole 44 and comparable to the most efficient acetylations of cellulose under homogeneous conditions 65,66 . While increasing the amount of N-acetylimidazole decreases the reaction efficiency and the reaction rate (Supplementary Table 2 and Supplementary Fig.…”

Section: Control Of Chemical Accessibility and Effect On Bulk Propertiesmentioning

confidence: 82%

Unique reactivity of nanoporous cellulosic materials mediated by surface-confined water

et al. 2021

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The remarkable efficiency of chemical reactions is the result of biological evolution, often involving confined water. Meanwhile, developments of bio-inspired systems, which exploit the potential of such water, have been so far rather complex and cumbersome. Here we show that surface-confined water, inherently present in widely abundant and renewable cellulosic fibres can be utilised as nanomedium to endow a singular chemical reactivity. Compared to surface acetylation in the dry state, confined water increases the reaction rate and efficiency by 8 times and 30%, respectively. Moreover, confined water enables control over chemical accessibility of selected hydroxyl groups through the extent of hydration, allowing regioselective reactions, a major challenge in cellulose modification. The reactions mediated by surface-confined water are sustainable and largely outperform those occurring in organic solvents in terms of efficiency and environmental compatibility. Our results demonstrate the unexploited potential of water bound to cellulosic nanostructures in surface esterifications, which can be extended to a wide range of other nanoporous polymeric structures and reactions.

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Section: Control Of Chemical Accessibility and Effect On Bulk Propertiesmentioning

confidence: 82%

Unique reactivity of nanoporous cellulosic materials mediated by surface-confined water

et al. 2021

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“…The decrease in the modulus at the crossover point suggested fewer entanglements and a less interaction between the macromolecular chains, thereby reducing the resistance to deformation. 28 , 33 …”

Section: Resultsmentioning

confidence: 99%

Close Packing of Cellulose and Chitosan in Regenerated Cellulose Fibers Improves Carbon Yield and Structural Properties of Respective Carbon Fibers

et al. 2020

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A low carbon yield is a major limitation for the use of cellulose-based filaments as carbon fiber precursors. The present study aims to investigate the use of an abundant biopolymer chitosan as a natural charring agent particularly on enhancing the carbon yield of the cellulose-derived carbon fiber. The ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH]OAc) was used for direct dissolution of cellulose and chitosan and to spin cellulose–chitosan composite fibers through a dry-jet wet spinning process (Ioncell). The homogenous distribution and tight packing of cellulose and chitosan revealed by X-ray scattering experiments enable a synergistic interaction between the two polymers during the pyrolysis reaction, resulting in a substantial increase of the carbon yield and preservation of mechanical properties of cellulose fiber compared to other cobiopolymers such as lignin and xylan.

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“…It is a technology that makes possible the sustainable conversion of cellulose and old textiles into new, high-quality textile fibres [53]. Moreover, Mattel Inc. sources 93% of paper and wood fibre used in its packaging and products from recycled materials.…”

Section: Influence Of Mechanical Recycling On (Bio)degradablementioning

confidence: 99%

End-of-Life Options for (Bio)degradable Polymers in the Circular Economy

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Musioł

Zawidlak-Węgrzyńska

et al. 2021

Advances in Polymer Technology

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End-of-life options for plastics include recycling and energy recovery (incineration). Taking into account the polymeric waste, recycling is the intentional action that is aimed at reducing the amount of waste deposited in landfills by industrial use of this waste to obtain raw materials and energy. The incineration of waste leads to recovery of the energy only. Recycling methods divide on mechanical (reuse of waste as a full-valuable raw material for further processing), chemical (feedstock recycling), and organic (composting and anaerobic digestion). The type of recycling is selected in terms of the polymeric material, origin of the waste, possible toxicity of the waste, and its flammability. The (bio)degradable polymers show the suitability for every recycling methods. But recycling method should be used in such a form that it is economically justified in a given case. Organic recycling in a circular economy is considered to be the most appropriate technology for the disposal of compostable waste. It is addressed for plastics capable for industrial composting such as cellulose films, starch blends, and polyesters. The biological treatment of organic waste leads also to a decrease of landfills and thereby reducing methane emissions from them. If we add to their biodegradability the absence of toxicity, we have a biotechnological product of great industrial interest. The paper presents the overview on end-of-life options useful for the (bio)degradable polymers. The principles of the circular economy and its today development were also discussed.

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

Cited by 34 publications

References 64 publications

Unique reactivity of nanoporous cellulosic materials mediated by surface-confined water

Unique reactivity of nanoporous cellulosic materials mediated by surface-confined water

Close Packing of Cellulose and Chitosan in Regenerated Cellulose Fibers Improves Carbon Yield and Structural Properties of Respective Carbon Fibers

End-of-Life Options for (Bio)degradable Polymers in the Circular Economy

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