被服材料と水との相互作用性に関する基礎的研究

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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.
  • 被服材料と水との相互作用性に関する基礎的研究-6-熱伝達型熱量計による水分収着熱の測定〔英文〕
  • ヒフク ザイリョウ ト ミズ ト ノ ソウゴ サヨウセイ ニ カンスル キソテ
  • AND TEXTILES: PART VI. MEASUREMENT OF THE HEAT OF MOISTURE SORPTION BY A HEAT TRANSFER TYPE CALORIMETER

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The heat of wetting W and further the differential heat of moisture sorption QL were observed as a function of moisture regain α for normal viscose rayon and nylon 6 fiber at 30°C by using a heat transfer type calorimeter in order to investigate the interaction of water with textiles in terms of thermodynamic parameters.<br>Critical value of W at dryness, W(α=0), was found to be 23.4±0.5 and 5.8±0.3 cal/gram of dry material, for the normal viscose rayon and the nylon 6 fiber, respectively. The differential heat of moisture sorption QL was determined from negative slope of empirical formula: i.e. QL(α)=-dW(α)/dα The critical value at dryness, QL(α=0), was found to be 273±4 and 218±18 cal/gram of liquid water for the respective specimens with good agreement with the reported values of these materials. The excess energy of the sorbed water, (TΔSL), was estimated to attain around 100 cal/gram of liquid water at dryness for both specimens, which is roughly equal to the latent heat of fusion of ice.<br>Another critical value of W at saturation regain, W(α=αs), which had been supposed to be zero by several authors, was found to be small in magnitude but definitely finite for both specimens. QL(α=αs) as well as (TΔSL) at saturation were also found to be finite, strongly suggesting the sorbed water, even near saturation, to be still in a little more ordered state than in the liquid state. All of these results confirms the heat transfer type calorimeter adopted here to be fully reliable for the determination of thermodynamic quantities in the moisture sorption process of the textile materials.

収録刊行物

  • 繊維学会誌

    繊維学会誌 43 (11), 567-577, 1987

    社団法人 繊維学会

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