The water vapor sorption behavior of a galactomannan cellulose nanocomposite film analyzed using parallel exponential kinetics and the Kelvin–Voigt viscoelastic model

Barbara A. Keating, Callum A. S. Hill, Dongyang Sun, Rob English, Phil Davies, Charles McCue

Research output: Contribution to journalArticle

26 Citations (Scopus)
47 Downloads (Pure)

Abstract

Nanocomposite films have been developed where a galactomannan (guar) matrix was reinforced with cellulose nanowhiskers and plasticized using sorbitol. The properties of these films were compared with films made from guar only. The films were examined using scanning electron microscopy and dynamic vapor sorption. The sorption kinetics properties were analyzed using parallel exponential kinetics (PEK) and this data interpreted using the Kelvin-Voigt (K-V) viscoelastic model. Substantial differences in sorption behavior were noted between the guar and cellulose reinforced guar films. Addition of cellulose nanowhiskers (CNWs) to the guar resulted in a change in the shape of the isotherm, as well as a reduced equilibrium moisture content throughout the hygroscopic range. With the guar film, hysteresis between the adsorption and desorption branches of the isotherm occurred up to 75% RH, where it collapsed. Dynamic mechanical analysis showed that the collapse of the hysteresis loop occurred at the glass transition temperature of the guar film. However, addition of CNWs to the guar produced a film where sorption hysteresis was found to occur throughout the hygroscopic range. The applicability of the K-V interpretation of the sorption kinetics is discussed.
Original languageEnglish
Pages (from-to)2352-2359
Number of pages8
JournalJournal of Applied Polymer Science
Volume129
Issue number4
Early online date8 Mar 2013
DOIs
Publication statusPublished - 15 Aug 2013

Keywords

  • adsorption
  • cellulose
  • wood products
  • composites
  • films
  • glass transition

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