26—water-Vapour Adsorption Isotherms of Wool

Watt, I. C.; d’Arcy, Richard

doi:10.1080/00405007908658854

Cited by 44 publications

(29 citation statements)

References 15 publications

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“…The curve thus obtained was plotted using a Wang System 2200 Plotter and is shown in Figure 2. The curve corresponds well with the values given by Watt and D'Arcy [5] for sorption at 20°C. It should be pointed out that slight differences are to be expected in the sorption curve, depending on whether the sample is exposed to continual humidity increments, as in this case, or whether the dry sample is exposed to the required humidity in one step (cf.…”

Section: Example Of Resultssupporting

confidence: 51%

“…It should be pointed out that slight differences are to be expected in the sorption curve, depending on whether the sample is exposed to continual humidity increments, as in this case, or whether the dry sample is exposed to the required humidity in one step (cf. [5]). Thus with the apparatus described here, routine determination of sorption curves can be carried out considerably faster and with the possibility for better control of conditions than with the desiccator method.…”

Section: Example Of Resultsmentioning

confidence: 93%

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A Rapid Method for Determining the Sorption Characteristics of Textile Materials 1

Finnimore¹,

Wortmann²

1980

Textile Research Journal

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Section: Example Of Resultssupporting

confidence: 51%

Section: Example Of Resultsmentioning

confidence: 93%

A Rapid Method for Determining the Sorption Characteristics of Textile Materials 1

Finnimore¹,

Wortmann²

1980

Textile Research Journal

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“…At present, however, no specific group reagent for the hydroxyl groups, by which only the hydroxyl groups can be converted to nonpolar residues, has been known. In this section, we investigate the contribution of amino and carboxyl groups to the amount of bound water on wool fibers by DSC, using reactions designed to remove some of the polar groups without leaving bulky substituents in their place [ 14,32,33].…”

Section: Effect Of Chemical Modifications On States Of Watermentioning

confidence: 99%

States of Water Sorbed on Wool as Studied by Differential Scanning Calorimetry

Sakabe

Ito

Miyamoto

et al. 1987

Textile Research Journal

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The states of water sorbed on Merino wool fibers, their histological components, and chemically modified wool fibers were investigated by differential scanning calorimetry (DSC) in order to elucidate the amount of bound water on wool fibers, the differences between the histological components of wool fibers, and the effect of polar groups on the states of water sorbed on wool fibers. For the sake of comparison, the states of water sorbed on cotton and silk were also examined. There may exist three different kinds of water sorbed on wool fibers, i.e., free water, freezing bound water, and nonfreezing bound water. The amount of bound water on wool fibers is larger than that on cotton yam and silk. The amount of bound water on cortical cells is about two times higher than that on cuticular cells. The amount of bound water on nonkeratinous cell components is about three times higher than that on keratinous cell components. The cell membrane complex plays an important role in water penetrating to wool fibers, but its contribution to the amount of bound water is negligible. The contribution of polar groups in wool fibers to the amount of bound water is not specific at high water contents, indicating that the peptide groups of the main chain play a significant role as water binding sites at high water contents.Many of excellent properties of wool as a textile fiber are more or less associated with the specific interactions of wool proteins with water. The ability to bind and absorb large amounts of water is one of the characteristics of wool fibers [ 13]. A relatively large number of .papers have examined the interaction of wool fibers with water using water vapor sorption isotherms [5, 14, 30, 32, 331 and basic calorimetric techniques [4, 20, 26]. Workers have established that part of the water sorbed on natural polymers such as keratin proteins and cellulose and silk fibroin has properties that are markedly different from free water. Many different works have substantiated this consideration [8, 10, 18; 19, 21, 22, 24, 34].On the other hand, wool consists of several histological components that are very different in chemical and physical properties [2,13,36]. It is important to elucidate the differences between these histological components and the functions of individual cell components. Numerous efforts have been devoted to this problem [2,11,12,36]. The accessibility of water molecules to individual histological components of wool has also been studied extensively from various points of view [6,7,23,27,28,29,36], but no study has reported so far on the states of water sorbed on the individual histological components of wool fibers.Recently, Nakamura et al. [22] pointed out that there are three different kinds of sorbed water on polymer: free water, freezing bound water, and nonfreezing bound water, based on the studies using differential scanning calorimetry (DSC). Recent developments in microcalorimetry by DSC enable us to evaluate the contents of free and bound water on polymers [22]. It is of interest to exam...

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“…Keratin fibres are known to absorb moisture up to 33% of their weight and to exhibit a large hysteresis at desorption (a large difference between the absorbed and desorbed moisture amount at the same relative humidity, RH) supposed to be due to the slow relaxation of the keratin structure [18,19]. As indicated by the amino-acid analysis, the micro-tubes retain most of their original overall structure.…”

Section: °C 238°cmentioning

confidence: 84%