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Sökning: WFRF:(Doghieri F.)

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1.
  • Hedenqvist, Mikael S., et al. (författare)
  • The significance of the zero-concentration diffusivity value obtained from integral desorption data
  • 2002
  • Ingår i: Polymer. - 0032-3861 .- 1873-2291. ; 43:1, s. 223-226
  • Tidskriftsartikel (refereegranskat)abstract
    • n-Hexane zero-concentration diffusivity in high density polyethylene obtained 'indirectly' from integral desorption measurements using the free volume concept was compared with the zero-concentration diffusivity obtained directly at low-n-hexane activities using a quartz-ring system. The difference between the results obtained by the indirect and direct methods was within the experimental error. The concentration dependence of the diffusivity predicted by the Cohen-Turnll-Fujita free volume theory was in accordance with experimental data.
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2.
  • Ritums, J. E., et al. (författare)
  • Assessing the transport properties of organic penetrants in low-density polyethylene using free volume models
  • 2007
  • Ingår i: Journal of Polymer Science Part B. - : Wiley. - 0887-6266 .- 1099-0488. ; 45:6, s. 723-734
  • Tidskriftsartikel (refereegranskat)abstract
    • Three models, two of them relying on free volume-the Cohen-Turnbull-Fujita (CTF) model and the Vrentas-Duda (VD) model, and the third being empirical using an exponential concentration dependence of the diffusivity, were applied to desorption data for a series of alkane penetrants (2,2-dimethylbutane, cyclohexane, n-hexane, n-decane, and n-tetradecane) in low-density polyethylene. The CTF model described the desorption data very well and better than the exponential diffusion law. The VD model with the attractive feature of being based on independently determined parameters was unsuccessful in describing the desorption data. Diffusivity data indicated that the three components outside the crystal core were less accessible to n-tetradecane than to the other penetrants. This indication was further substantiated by solubility data.
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