Effect of Solvent Exchange on the Solid Structure and Dissolution Behavior of Cellulose

Ishii, Daisuke; Tatsumi, Daisuke; Matsumoto, Takayoshi

doi:10.1021/bm034065g

Cited by 82 publications

(55 citation statements)

References 24 publications

(37 reference statements)

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“…In fact, several reports in the literature noted that depending on the acid hydrolysis process used, variability in shapes and sizes are not consistent from extraction to extraction and can induce agglomeration of smaller cellulose fibers into larger fibers with various geometries [29][30][31]. Hence the stages of drying of cellulose are threefold-(1) a constant ratedrying period, (2) the first falling rate-drying period, and (3) the second falling rate-drying period [32][33][34][35]. In stage 1, water begins to evaporate, causing cellulose particles to 8 International Journal of Chemical Engineering begin diffusing closer together and eventually exposing the polymer's surface enabling surface water evaporation (the first falling rate-drying period).…”

Section: (D)mentioning

confidence: 99%

Influence of Strong Acid Hydrolysis Processing on the Thermal Stability and Crystallinity of Cellulose Isolated from Wheat Straw

Huntley

Crews

Abdalla

et al. 2015

International Journal of Chemical Engineering

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Cellulose extractions from wheat straw via hydrochloric, nitric, and sulfuric acid hydrolysis methods were carried out. X-ray diffraction spectral analyses reveal that depending on the acid conditions used the structure of the cellulose exhibited a mixture of polymorphs (i.e., CI and CIII cellulose phases). In addition, the percent crystallinity, diameter, and length of the cellulose fibers varied tremendously as determined by X-ray diffraction and scanning electron microscopy. Thermal gravimetric analysis measurements revealed that the thermal stability of the extracted cellulose varied as a function of the acid strength and conditions used. Scanning electron microscopy analysis revealed that the aggregation of cellulose fibers during the drying process is strongly dependent upon the drying process and strength of the acids used.

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Section: (D)mentioning

confidence: 99%

Influence of Strong Acid Hydrolysis Processing on the Thermal Stability and Crystallinity of Cellulose Isolated from Wheat Straw

Huntley

Crews

Abdalla

et al. 2015

International Journal of Chemical Engineering

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show abstract

“…The increase in the surface roughness of cellulose has been already shown by the increase in the fractal dimension, although it was investigated in the dried state. 6 Considering these results, it is concluded that the increase in the amount of small pores induced by the DMAc treatment leads to the enlargement of the surface area and consequently facilitates the access of solvent molecules to the cellulose solid, resulting in the facilitated dissolution in LiCl/DMAc.…”

Section: Saxs Measurementsmentioning

confidence: 93%

“…We have formerly shown that the structural heterogeneity of cellulose in the dried state as observed by SAXS is evaluated by fractal dimension. 6 Because the fractal nature originates in the aggregation of cellulose microfibril, it is considered that the value of R g reflects the size of cellulose microfibril as an elemental structural unit of cellulose.…”

Section: Saxs Measurementsmentioning

confidence: 99%

“…Dissolution of cellulose is facilitated by such a simple method without the destruction of bulk morphology and crystalline structure. 6 Therefore, to clarify the reason why the dissolution of cellulose is facilitated by the solvent exchange, we have investigated the effect of the solvent exchange on the nanometer-scale solid structure and the molecular mobility of cellulose using solid-state NMR and small-angle X-ray scattering (SAXS). 6 As a result, it was shown that the solvent exchange affects nanometer-scale solid structure of cellulose.…”

Section: Introductionmentioning

confidence: 99%

“…6 Therefore, to clarify the reason why the dissolution of cellulose is facilitated by the solvent exchange, we have investigated the effect of the solvent exchange on the nanometer-scale solid structure and the molecular mobility of cellulose using solid-state NMR and small-angle X-ray scattering (SAXS). 6 As a result, it was shown that the solvent exchange affects nanometer-scale solid structure of cellulose. Although these spatial scales cover the microfibrillar morphology of cellulose, 1,2 it is supposed that the pore structure (size distribution and volume of pore) of cellulose within these spatial scales is also affected.…”

Section: Introductionmentioning

confidence: 99%

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

Ishii

Kanazawa

Tatsumi

et al. 2006

J of Applied Polymer Sci

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Effect of solvent exchange, i.e., the sequential immersion in water, acetone, and DMAc on the pore structure of cellulose and its dissolution behavior in lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) was investigated by using size exclusion liquid chromatography (SEC), dynamic light scattering (DLS), and small-angle X-ray scattering (SAXS). In the SEC experiment, poly(styrene)s, diethyl phthalate, and acetone were used as probe solutes and 2-butanone was used as an eluent. Capacity factor of these solutes in the solvent-exchanged cellulose were larger than those in the untreated one. This was remarkable when diethyl phthalate and acetone were used as solutes. Since the molecular radii of these solutes were estimated to be less than 1 nm, it was shown that the solvent exchange increases the amount of pores within cellulose with the radii of less than 1 nm. In the SAXS experiment, structural difference between the solvent exchanged and the untreated celluloses was observed when the celluloses were immersed in acetone. Values of specific inner surface and average chord length calculated from SAXS profile showed that the amount of small pores was increased in the solvent exchanged cellulose. Considering the results from SEC, DLS, and SAXS measurements, facilitated dissolution of the solvent exchanged cellulose in LiCl/DMAc was attributed to the increase in the pores with the radii of less than 1 nm.

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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 Solid Structure and Dissolution Behavior of Cellulose

Cited by 82 publications

References 24 publications

Influence of Strong Acid Hydrolysis Processing on the Thermal Stability and Crystallinity of Cellulose Isolated from Wheat Straw

Influence of Strong Acid Hydrolysis Processing on the Thermal Stability and Crystallinity of Cellulose Isolated from Wheat Straw

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

All‐Cellulose Composites

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