Fundamental Studies on the Interaction Between Moisture and Textiles

Kohata, Kazunori; Miyagawa, Mariko; Takaoka, Akira; Kawai, Hiromichi

doi:10.2115/fiber.42.3_t136

Sen-i Gakkaishi

1986

DOI: 10.2115/fiber.42.3_t136

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Fundamental Studies on the Interaction Between Moisture and Textiles

Kazunori Kohata

Mariko Miyagawa

Akira Takaoka

et al.

Abstract: Twelve kinds of cellulosic

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1987

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Cited by 7 publications

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References 5 publications

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“…A similar conclusion has been obtained in a previous FT-IR study on the moisture sorption isotherm of nylon 6 film.14) The fact that the excess energy of (TdSL) and, consequently, the entropy loss of dSL remain at finite values even at the saturation regain, is also significant to assure the sorbed water near saturation to be still in a little more ordered state than in the liquid state. [12][13][14][15] …”

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Fundamental studies on the interaction between moisture and textiles. Part VI. Measurement of the heat of moisture sorption by a heat transfer type calorimeter.

et al. 1987

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Fundamental studies on the interaction between moisture and textiles. Part VI. Measurement of the heat of moisture sorption by a heat transfer type calorimeter.

et al. 1987

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Effect of bound water on structural change of regenerated cellulose

Hatakeyama

Ikeda

Hatakeyama³

1987

Makromol. Chem.

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Phase transition of water sorbed in regenerated cellulose (11), for water contents ranging from 0 to 1 ,O (water/dry cellulose, g/g), was investigated by differential scanning calorimetry @SC).It was found that the amount of water bound to each glucose unit is m. 3 mol considering that water diffuses only into the amorphous region of cellulose. The increase of this amount by adding excess water to cellulose suggests that the amorphous region of cellulose I1 increases in the presence of water. The transient state, at a water content ranging from 0,4 to 0,6, where the intermolecular distance expands, is reflected in an intermediate crystallization at a temperature between the crystallization of free water and freezing bound water. Mechanical properties of cellulose I1 under moist conditions were related to the results obtained by DSC. Further, the strength at break of cellulose I1 was compared with that of natural cellulose (I). The strength of cellulose I1 decreases in presence of bound water, whereas that of cellulose I increases. Based on the comparison of the results of DSC and mechanical properties of celluloses I and 11, the difference is attributed to the structural change of the amorphous region when water molecules are bound to the hydroxyl groups of cellulose. The defect or internal strain of the amorphous region of cellulose I decreases and the molecular chain is transformed into a more regular arrangement when water molecules break hydrogen bonds. On the other hand, the amorphous chain of cellulose I1 takes a more released and expanded arrangement in presence of water molecules which break hydrogen bonds in the crystalline region of cellulose 11. The decrease of crystallinity was observed by x-ray diffraction.

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Sorption and transport of water vapor in alginic acid, sodium alginate, and alginate‐cobalt complex films

Hirai

Odani

1994

J Polym Sci B Polym Phys

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The sorption and the transport of water vapor in films of alginic acid (G1), sodium alginate (G1Na), and alginate‐cobalt complex (G1Co) were studied at 30°C by employing the weighing method. Sorption isotherms for all films of G1, G1Na, G1Co were of type II in the Brunauer's classification. The integral absorption from, and desorption to, zero pressure were non‐Fickian type for all films studied. The mean permeability coefficient P, which was determined by the cup method, increased with the increase of vapor pressure, especially in the low vapor pressure region. P for G1Na was much higher than that for G1, which mainly reflects more hygroscopic nature of G1Na than that of G1. The values of P for G1Co were lower than those for G1 at lower pressures and then approached those for G1 at higher vapor pressures. Integral diffusion coefficient D evaluated as P/S, where the solubility coefficient S was evaluated from sorption isotherms, increased rapidly with increasing water concentration and then leveled off. In the concentration region studied, the magnitude of D and its dependence on concentration for H2O‐G1Na system did not differ much from those for H2O‐G1 system. D for H2O‐G1Co system was much lower than that for H2O‐G1 system. © 1994 John Wiley & Sons, Inc.

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Fundamental Studies on the Interaction Between Moisture and Textiles

Abstract: Twelve kinds of cellulosic

Cited by 7 publications

References 5 publications

Fundamental studies on the interaction between moisture and textiles. Part VI. Measurement of the heat of moisture sorption by a heat transfer type calorimeter.

Fundamental studies on the interaction between moisture and textiles. Part VI. Measurement of the heat of moisture sorption by a heat transfer type calorimeter.

Effect of bound water on structural change of regenerated cellulose

Sorption and transport of water vapor in alginic acid, sodium alginate, and alginate‐cobalt complex films

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