The water vapour sorption characteristics and kinetics of different wool types

Graham Alan Ormondroyd, Simon F. Curling, Elie Mansour, Callum A.S. Hill

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13 Citations (SciVal)


The water vapour sorption behaviour of a range of sheep wool types and alpaca was studied using dynamic vapour sorption. Sorption isotherms were interpreted using the polymer sorption model developed by Vrentas and Vrentas. Satisfactory fits were obtained for absorption and desorption isotherms with the adjustment of parameters outside the scope of what is allowed. This is possibly because the underlying Flory–Huggins approach does not take into account any clustering of sorbate within the polymer. Water clustering in the wool fibre, determined using the Zimm–Lundberg clustering function, starts above a fibre moisture content of approximately 20%. Sorption kinetics were analysed using the parallel exponential kinetics model, providing excellent fits and allowed for calculation of a fibre modulus at different relative humidities; the values were reasonable at the upper end of the hygroscopic range, but were overestimated at the lower end of the range.

Original languageEnglish
Pages (from-to)1198-1210
Number of pages13
JournalJournal of the Textile Institute
Issue number7
Early online date31 Aug 2016
Publication statusPublished - 3 Jul 2017


  • kinetics
  • modelling
  • moisture
  • relative humidity
  • Wool

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Agricultural and Biological Sciences(all)
  • Polymers and Plastics
  • Industrial and Manufacturing Engineering


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