An infrared spectroscopic investigation of the hydration of cellulose

Kalutskaya, E.P.; Gusev, S. A.

doi:10.1016/0032-3950(80)90378-0

Cited by 32 publications

(14 citation statements)

References 3 publications

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“…They found that, as the polymer becomes more hydrophilic, the v a (OH) and v s (OH) bands, which represent the asymmetric and symmetric OH stretching vibrations respectively, gradually shift to lower wavenumbers. The lowering of the OH stretching frequency in the IR spectrum is attributed to hydrogen bond formation as reported in previous studies [17,18].…”

Section: Introductionsupporting

confidence: 81%

Effect of Moisture on the Orientation Birefringence of Cellulose Esters

et al. 2011

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Orientation birefringence and its wavelength dispersion are studied for hot-drawn films of cellulose esters such as cellulose triacetate (CTA), cellulose diacetate (CDA), and cellulose acetate propionate (CAP) exposed to three different humidities of environments. Hot-drawn CTA films show negative birefringence that decreases with increasing wavelength. On the other hand, CDA and CAP films show positive birefringence that increases with increasing wavelength, i.e., the so-called extraordinary wavelength dispersion of birefringence. Upon exposure to high humidity environment, the orientation birefringence of CDA and CAP decreases. The decrease is prominent for the samples containing a large amount of water. CTA, however, shows an increase in magnitude of its negative orientation birefringence with increasing moisture content. The results can be explained by the increase of the polarizability anisotropy perpendicular to the stretching direction in the cellulose esters. It is found from ATR-FTIR measurements that hydrogen bonds are formed between carbonyl groups of cellulose esters and water molecules. Considering that orientation birefringence of cellulose esters is determined mainly by ester groups, the formation of hydrogen bonds contributes to the polarizability anisotropy, thus affecting the orientation birefringence.

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Section: Introductionsupporting

confidence: 81%

Effect of Moisture on the Orientation Birefringence of Cellulose Esters

et al. 2011

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“…The band at 3560 cm" 1 is the only one which is seen to have any connection with water (Kalutskaya and Gusev 1981).The other bands attributed to water: 3200 cm" 1 (strongly bound water) and 3400 cm" 1 (H 2 O clusters) do not appear in the cellulose spectra. Furthermore, the bands at 3665 and 3775 crri" 1 are attributed to free water.…”

Section: Discussionmentioning

confidence: 79%

“…In a-conventional spectrum of cellulose the adsorbed water is indicated by the band at 1635 cm' 1 (Tsuboi 1957). Using thin films produced from cellulose fibres which were humidified at various humidities Kalutskaya and Gusev (1981) attributed several bands of the IR spectrum to free and hydrogen-bonded water.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water on the OH Valency Range in Deconvoluted FTIR Spectra of Cellulose

Fengel¹

1993

HFSG

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The system cellulose-water was studied by FTIR spcotroscopy using KBr pellets dried and humidified for various periods of time.The spectra of the OH and CH 2 vibration range were deconvoluled.The intensity of the various bands is influenced by water in varying degrees.The band positions, however, remain constant except for very high water contents. Drying improves the resolution of individual bands.The results suggest that the attribution of various bands in the range 3200-3700 cm" 1 to structural elements of the system cellulose-water as described in literature, be reconsidered.

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“…At about 1630 cm −1 , a broad signal could be seen in the in‐phase spectrum of the birch kraft pulp under humid conditions, but this signal was not present under dry conditions. In this area, molecularly adsorbed water absorbs IR radiation17 and nearby, at about 1600 cm −1 , the carboxylate ion of xylan18 has a high absorptivity.…”

Section: Resultsmentioning

confidence: 99%

Softening of wood polymers induced by moisture studied by dynamic FTIR spectroscopy

Åkerholm¹,

Salmén²

2004

J of Applied Polymer Sci

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ABSTRACT:The softening of the wood polymers is very important in the utilization of wood fiber products. To better to understand how the hemicelluloses interact with the other wood polymers in the fiber ultrastructure and contribute to the mechanical properties of the wood, their softening inside the cell wall of pulp fibers was studied by dynamic FTIR spectroscopy under humid conditions. The two hemicelluloses of spruce, glucomannan and xylan, exhibited different softening behaviors indicating a different organization of the two hemicelluloses inside the cell wall. Lignin in mechanical pulp showed a more viscoelastic behavior already under dry conditions than the polysaccharides of the cell wall.

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An infrared spectroscopic investigation of the hydration of cellulose

Cited by 32 publications

References 3 publications

Effect of Moisture on the Orientation Birefringence of Cellulose Esters

Effect of Moisture on the Orientation Birefringence of Cellulose Esters

Influence of Water on the OH Valency Range in Deconvoluted FTIR Spectra of Cellulose

Softening of wood polymers induced by moisture studied by dynamic FTIR spectroscopy

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