Effect of solvent exchange on the pore structure and dissolution behavior of cellulose

Ishii, Daisuke; Kanazawa, Yuki; Tatsumi, Daisuke; Matsumoto, Takayoshi

doi:10.1002/app.25424

Cited by 22 publications

(13 citation statements)

References 30 publications

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“…[20] The solvent exchange was further known to increase the amount of pores within cellulose with the radii of less than 1 nm. [21] Based on these previous results, this paper dealt with dissolving BC from its gel-sheet structure in the DMAc-LiCl solution and preparing excellent transparent BC films. Then, structural and mechanical properties of the prepared BC sheets were compared with those of the native state of BC.…”

Section: Introductionmentioning

confidence: 98%

Properties of bacterial cellulose transparent film regenerated from dimethylacetamide-LiCl solution

Yudianti

Syampurwadi

Onggo

et al. 2016

Polym. Adv. Technol.

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Excellent transparent films were prepared from bacterial cellulose (BC) sheets by solubilization of its defibrillated freeze-dried specimens in a solvent of dimethylacetamide (DMAc) containing 8.0% (w/w) lithium chloride (LiCl), and their properties were compared with those of the native BC. Fibrillar structure of the native BC disappeared after dissolution, and the film formed after dissolution also loose this structure. Occurence of structural transformation from crystalline to amorphous state was also evidenced by X-ray diffraction, solid state cross polarization/magic angle spinning 13 C-NMR and attenuated total reflectance-Fourier transform infrared spectroscopic analyses. In addition, excellent 3D uniform structure of the transparent BC film was further evidenced by X-ray micro computed tomography. Plastic-like characteristic was enhanced by film formation after dissolving the BC specimens in the DMAc-LiCl solution as shown by changing mechanical properties, a slight decrease in tensile strength (67.2 to 59.6 MPa) and breaking stress (67.2 to 58.4 MPa) but significant increase in elongation at break from 3.4 to 10.5%, and improvement of work of fracture from 5.8 to 21.2 kJ/m 2 .

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Section: Introductionmentioning

confidence: 98%

Properties of bacterial cellulose transparent film regenerated from dimethylacetamide-LiCl solution

Yudianti

Syampurwadi

Onggo

et al. 2016

Polym. Adv. Technol.

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“…Examples of solvents that dissolve cellulose physically, i.e., without forming covalent bonds are LiCl/N,N-dimethylacetamide, DMAc, quaternary ammonium fluorides/DMSO and, more recently, ionic liquids. 1,2 The resulting cellulose solutions have been employed, inter alia, for the analysis of cellulose, 3,4 and the preparation of a myriad of derivatives, whose properties are much better controlled than those that are prepared under heterogeneous conditions (solid biopolymer/liquid derivatizing agent). 1,[5][6][7][8][9][10] However, the homogeneous reaction scheme is complex and multi-step, including cellulose activation, dissolution, and subsequent reaction with the derivatizing agent.…”

Section: Introductionmentioning

confidence: 99%

A physical organic chemistry approach to dissolution of cellulose: effects of cellulose mercerization on its properties and on the kinetics of its decrystallization

Ramos¹,

Morgado²,

Gessner³

et al. 2011

Arkivoc

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The effects of alkali treatment on the structural characteristics of cotton linters and sisal cellulose samples have been studied. Mercerization results in a decrease in the indices of crystallinity and the degrees of polymerization, and an increase in the α-cellulose contents of the samples. The relevance of the structural properties of cellulose to its dissolution is probed by studying the kinetics of cellulose decrystallization, prior to its solubilization in LiCl/N,N-dimethylacetamide (DMAc). Our data show that the decrystallization rate constants and activation parameters are only slightly dependent on the physico-chemical properties of the starting celluloses. This multistep reaction is accompanied by a small enthalpy and large, negative, entropy of activation. These results are analyzed in terms of the interactions within the biopolymer chains during decrystallization, as well as those between the two ions of the electrolyte and both DMAc and cellulose.

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“…The cellulose is first subjected to a so-called activation procedure during which the fiber is penetrated with a polar medium [82]. Interestingly, the activation step does not affect cellulose crystallinity [84]. Amorphous cellulose obtained by ball milling also proves difficult to dissolve in the absence of activation [83].…”

Section: Preparation and Synthesismentioning

confidence: 99%

“…Interestingly, the activation step does not affect cellulose crystallinity [84]. In the literature, many reports on ACCs report the use of LiCl/DMAc [12,65,67,[87][88][89][90][91][92][93][94][95], which may be because of its ability to completely dissolve high molecular weight cellulose [84]. Stirring is also critically important for cellulose dissolution to proceed and avoid formation of a heterogeneous fiber-solvent mixture.…”

Section: Preparation and Synthesismentioning

confidence: 99%

All‐Cellulose Composites

Staiger

Huber

2012

Wiley Encyclopedia of Composites

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Composite materials comprising a mixture of shellac resin as the matrix and cellulose as the reinforcement were developed. The influence of the reinforcement content and the concentration of additives on the mechanical performance and processing were investigated. A high content of cellulose and low concentrations of ethanol and polyethylene glycol produced biocomposites with high stress resistance and a high Young's modulus, whereas a low content of cellulose and a high concentration of additives gave samples a low Young's modulus and high elasticity. Two types of cellulose-based reinforcements with different polarity, namely, mechanically refined wood pulp and cellulose acetate butyrate particles, were compared. The efficiency of the composite over the two model reinforcements, i.e., hydrophilic and hydrophobic components, respectively, was also studied. Although particle reinforcement was easier to process and evenly dispersed into the matrix, its mechanical performance was lower compared with refined fibres. Scanning electron microscopy showed that the matrix better coated the fibres than the particles, resulting in better adhesion and mechanical performance. The morphology of reinforcement played a key role; long fibres oriented in the pulling direction ensured a better mechanical resistance than particle fillers.

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Effect of solvent exchange on the pore structure and dissolution behavior of cellulose

Cited by 22 publications

References 30 publications

Properties of bacterial cellulose transparent film regenerated from dimethylacetamide-LiCl solution

Properties of bacterial cellulose transparent film regenerated from dimethylacetamide-LiCl solution

A physical organic chemistry approach to dissolution of cellulose: effects of cellulose mercerization on its properties and on the kinetics of its decrystallization

All‐Cellulose Composites

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