Cellulose dissolution in an alkali based solvent: influence of additives and pretreatments

Kihlman, Martin; Medronho, Bruno; Romano, Anabela; Germgård, Ulf; Lindman, Björn

doi:10.1590/s0103-50532013000200017

Cited by 10 publications

(16 citation statements)

References 2 publications

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“…The probable reasons could be because the release of high pressure during the steam explosion increased the surface area of dissolving pulp and promoted fibre separation due to the fragmentation caused by the mechanical shearing force. The accessibility of cellulose to the solvents (NaOH/urea/thiourea) was thus increased ,. Similarly, mechanical refining increases the surface area of cellulose pulps through external fibrillation, internal delamination and fibre cutting, which create certain microfibrils on the surface of fibres, swell and loosen the internal structures of fibres ,.…”

Section: Resultsmentioning

confidence: 99%

“…Different treatments reportedly or potentially improved the cellulose reactivity of dissolving pulp. Previous work showed that steam explosion and mechanical refining resulted in an increase in dissolving pulp cellulose reactivity presumably via increased pore size, surface area, and swelling . Acid or enzymatic treatments have been used for increasing cellulose reactivity by decreasing the cellulose DP .…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Cold Caustic Extraction on the Purity, Accessibility and Reactivity of Dissolving‐Grade Pulp

Dou

Tang

2017

ChemistrySelect

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Prehydrolysis and cold caustic extraction (CCE) are two effective approaches to convert the traditional Kraft pulp to a dissolving‐grade pulp. Compared to prehydrolysis, CCE has several positive attributes but reduces final pulp reactivity. To gain insight into the factors that influence the reactivity of CCE treated cellulose, we compared the surface morphology, supramolecular properties and fibre properties of commercial dissolving pulp from prehydrolysis to dissolving grade cellulose upgraded using CCE. CCE treatment promoted the fibril aggregation and modified the initial cellulose I on Kraft pulps to cellulose II, thus decreasing final pulp reactivity. Various “post‐treatments” such as mechanical refining, steam explosion, induction of fibre kink and curl, sulfuric acid hydrolysis and endoglucanase hydrolysis effectively recover the reactivity lost during the production of dissolving pulp cellulose using a CCE step. Mechanical refining combined with endoglucanase treatment had the greatest effect increasing the reactivity from 32% to 75%.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Cold Caustic Extraction on the Purity, Accessibility and Reactivity of Dissolving‐Grade Pulp

Dou

Tang

2017

ChemistrySelect

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“…The recognition of its amphiphilic character that was recently demonstrated by Lindman et al [34] led to the demonstration of its capability as a graphite exfoliating agent and a component of nanocomposite films that are showing interesting possibilities as electrodes and as substrates in flexible electronics [35].…”

Section: Cellulosementioning

confidence: 99%

Synergy in food, energy and advanced materials production from biomass

Galembeck

2017

Pure and Applied Chemistry

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Biomass is a sustainable alternative to fossil fuels, as a source of energy and raw materials for industry. However, this is often criticized, based on an alleged competition with food production due to the presumed scarcity of agricultural land. Data from Brazil and Ethiopia show that the creation and dissemination of new agricultural technology actually allows a significant increase in the production of food as well as energy and raw materials from biomass, bringing economic, social and environmental benefits. Moreover, polymers from biomass display unique features that make them suitable as the basis for making advanced materials, with desirable combinations of chemical and physical properties required for some applications. For instance, natural rubber and cellulose have been used to create new complex nanostructured solids capable of performing new functions. Biomass can thus be exploited as a source of new materials as well as petrochemical-like building blocks.

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“…Yan and Gao speculate that the dissolution is mainly attributed to the Nacellulose complex and the PEG molecules worked as a hydrogen-bonding acceptor preventing the re-association of hydroxyl groups of cellulose and consequent gel formation [16]. However, some authors emphasize more on the weakening of hydrophobic interactions of cellulose molecules, which is caused by the amphiphilic nature of PEG [19,21,22]. Cellulose is also a class of amphipathic molecule [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…The regeneration process is also a critical process for the preparation of some regenerated cellulose products like the porous aerogels, and the role of PEG is also highlighted in this step. The originally formed relatively stable inclusion complex associated with cellulose, NaOH, and PEG, is disrupted by adding an acidic non-*Corresponding author: lijiangroup@163.com solvent such as hydrochloric acid, leading to the selfassociation of cellulose [21]. After the complex rearrangement of the hydrogen bonds, the cellulose crystalline texture is reformed, and the gel phase with cross-linked porous threedimensional structure is also generated.…”

Section: Introductionmentioning

confidence: 99%

Cellulose aerogels based on a green NaOH/PEG solution: Preparation, characterization and influence of molecular weight of PEG

Wan

2015

Fibers Polym

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A green cost-effective NaOH/polyethylene glycol (PEG) aqueous solution was adopted to fabricate nanoporous cellulose aerogels, and three kinds of PEG with different molecular weights (200, 4000, and 20000) was carried out to investigate the effect of PEG molecular weights on the morphology, specific surface area and pore structure, crystal structure, and thermal stability of the resulting aerogels. The results show that the PEG with the higher molecular weight promotes the dissolution of cellulose, the formation of pore structure, and the transformation of crystal structure from cellulose I to cellulose II. After being modified by methyltrichlorosilane (MTCS), the aerogels are hydrophobic, and exhibit the oil adsorption ratios of approximately 13-18 g/g, much higher than those of the untreated cellulose aerogels (10-15 g/g). Besides, the oil adsorption ratio has a positive correlation with the pore characteristic parameters (specific surface area and pore volume), revealing the facile controllability.

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Cellulose dissolution in an alkali based solvent: influence of additives and pretreatments

Cited by 10 publications

References 2 publications

The Influence of Cold Caustic Extraction on the Purity, Accessibility and Reactivity of Dissolving‐Grade Pulp

The Influence of Cold Caustic Extraction on the Purity, Accessibility and Reactivity of Dissolving‐Grade Pulp

Synergy in food, energy and advanced materials production from biomass

Cellulose aerogels based on a green NaOH/PEG solution: Preparation, characterization and influence of molecular weight of PEG

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