Temperature Dependence of Limiting Viscosity Number and Radius of Gyration for Cellulose Dissolved in Aqueous 8% Sodium Hydroxide Solution

Kamide, Kenji; Saito, Masatoshi; Kowsaka, Keisuke

doi:10.1295/polymj.19.1173

Cited by 35 publications

(16 citation statements)

References 28 publications

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“…It can be seen that the fluctuations increases slowly up until 40 C, after which the data become highly noisy. This suggests that strong attractive forces are acting upon the cellulose, something which does not agree with the result of Kamide et al (1987). These strong attractive forces cause the cellulose to aggregate into fewer, larger clusters with increasing temperature, which is the reason for the larger variance in the data at higher temperatures.…”

Section: Temperature Dependencementioning

confidence: 82%

On the dissolution state of cellulose in cold alkali solutions

et al. 2017

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We have characterized the dissolved state of microcrystalline cellulose (MCC) in cold alkali [2.0 M NaOH(aq)] solutions using a combination of small angle X-ray (SAXS) and static light scattering (SLS), 1 H NMR, NMR self-diffusion, and rheology experiments. NMR and SAXS data demonstrate that the cellulose is fully molecularly dissolved. SLS, however, shows the presence of large concentration fluctuations in the solution, consistent with significant attractive cellulose-cellulose interactions. The scattering data are consistent with fractal cellulose aggregates of micrometre size having a mass fractal dimension D $ 1:5. At 25 C the solution structure remains unchanged on the time scale of weeks. However, upon heating the solutions above 35 C additional aggregation occurs on the time scale of minutes. Decreasing or increasing the NaOH concentration away from the ''optimum'' 2 M also leads to additional aggregation. This is seen as an increase of the SAXS intensity at lower q values. Addition of urea (1.8 and 3.6 M, respectively) does not significantly influence the solution structure. With these examples, we will discuss how scattering methods can be used to assess the quality of solvents for cellulose.

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Section: Temperature Dependencementioning

confidence: 82%

On the dissolution state of cellulose in cold alkali solutions

et al. 2017

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“…NaOH ; (2) steam explosion process effectively breaks these hydrogen bonds (Okajima et al, 1990); (3) cellulose dissolves in aq. NaOH (Kamide et al, 1987); (4) regenerated cellulose films from aq. NaOH have high crystallinity, highly developed intramolecular hydrogen bonds, and selective uniplanar orientation of (11 -0) planes of cellulose Ⅱ crystal, and these structural parameters can be easily controlled by changing coagulation conditions such as coagulant concentration and temperature (Yang et al, 2007);…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Cellulose-Starch Blend Films Regenerated from Aqueous Sodium Hydroxide Solution

Miyamoto

Yamane

Seguchi

et al. 2009

FSTR

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It was reported in 1984 that cellulose could be dissolved in aqueous sodium hydroxide solution when the intramolecular hydrogen bonds of cellulose were partially broken down by physical treatments such as steam explosion. Although there have been many studies on alkali-soluble cellulose, little is known about cellulose blends made from aqueous sodium hydroxide solution. Therefore, we investigated the structure and properties of cellulose-starch blend films regenerated from the solution. The blends had a porous structure with an average pore size increased from 1 to 6 μm with increased starch content. These pores were observed separately from each other, leading to high water and oil absorbencies of these blend films (the oil absorbency of the blend film containing 50 % starch was over 400 %, ten times that of cellulose film). The results of X-ray measurements, dynamic viscoelastic measurements, enzyme etching, and iodine staining suggested that cellulose and starch were miscible in the amorphous regions but incompatible in the crystalline regions of the cellulose-starch blend films.

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“…NaOH solution by a steam explosion method (Okajima and Kamide, 1984). Further study confirmed dissolution of cellulose in a dilute NaOH solution by a light scattering method (Kamide et al, 1987). The degree of the intramolecular hydrogen to the oral sensations of the product are pleasant.…”

Section: Introductionmentioning

confidence: 70%

Comparison between Cellulose Blend Films Prepared from Aqueous Sodium Hydroxide Solution and Edible Films of Biopolymers with Possible Application for New Food Materials

Miyamoto¹,

Yamane²,

Seguchi³

et al. 2010

FSTR

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Cellulose treated by a steam explosion method can be dissolved into aqueous sodium hydroxide solution. The regenerated cellulose shaped from the cellulose-dissolving system can be used as a food material with various shapes, such as fiber, film, and particles. In the present study, the cellulose was blended with polysaccharides, and the structure and mechanical properties of cellulose-polysaccharide blend films were compared with commercial edible films. The tensile strength, tensile elongation, and bursting strength of cellulose-starch blend films in wet conditions were comparable to those of sheep casings and collagen films. In the viscoelastic measurements, mechanical properties of commercially available films of biopolymers such as starch, pullulan, and agar were greatly influenced by temperature and moisture; however, cellulose-starch blend films were much less influenced. This is a new characteristic achieved by blending starch with cellulose. Cellulose and cellulose-starch blend films were resistant to hot water, i.e., keeping their film forms in hot water. Moreover, disintegration of the blend films commonly seen in hot water can be controlled by blending carrageenan or sodium alginate as a third component.

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Temperature Dependence of Limiting Viscosity Number and Radius of Gyration for Cellulose Dissolved in Aqueous 8% Sodium Hydroxide Solution

Abstract: ABSTRACT:A regenerated cellulose with a weight-average molecular weight Mw of 8.0 x l Show more

Cited by 35 publications

References 28 publications

On the dissolution state of cellulose in cold alkali solutions

On the dissolution state of cellulose in cold alkali solutions

Structure and Properties of Cellulose-Starch Blend Films Regenerated from Aqueous Sodium Hydroxide Solution

Comparison between Cellulose Blend Films Prepared from Aqueous Sodium Hydroxide Solution and Edible Films of Biopolymers with Possible Application for New Food Materials

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