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In this report, the exothermic mechanism of wool fibers by adsorbing moisture is discussed in detail based on thermodynamics. The following results are : (1) Hygroscopic and exothermic value of wool fibers at the moisture adsorption were measured simultaneously, and it was confirmed that a large amount of heat on wool fibers generated at the initial stage of moisture adsorption. (2) Moreover, a weight change in connection with thermal variation of wool fibers in hygroscopic adsorption time were measured at the same time. It is suggested that the water molecules in wool fibers are adhering to protein molecules in a clustered state when the fibers generate the heat by moisture adsorption . (3) In the results of measurement for exothermic heat of wetting in relation to change of temperature, it was clarified that the contribution of three hydrophilic groups (-NH2, -OH, and -COOH) in keratin on heat of adsorption depended on the environmental temperature .

Development of Thermal Functional Fibers with Heat of Wetting. Part 2. Exothermic Mechanism of Heat of Wetting on Wool Fibers.