Journal of Thermal Analysis and Calorimetry

, Volume 82, Issue 1, pp 7–13 | Cite as

Non-isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel</o:p>

  • B. Janković
  • B. Adnađević
  • J. Jovanović
Article

Summary

Kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel was investigated using methods of non-isothermal thermal analysis. Methods of Kissinger, Coats-Redfern, Van Krevelen and Horowitz-Metzger were applied for determination the kinetics parameters: activation energy (E), pre-exponent (lnA) as well as the kinetics model ƒ(69) for the process of hydrogel dehydration under different heating rates. An existence of good agreement between determined values of kinetic parameters (Eand A), which were obtained applying different methods under the same heating rate. Functional relationship between changes of kinetic parameters of dehydration and changes of heating rate was established. An existence of compensation effect is accepted and explanation of compensation effect appearance during the hydrogel dehydration is suggested.

non-isothermal kinetics activation energy dehydration thermogravimetric analysis polyacrylic hydrogel 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • B. Janković
    • 1
  • B. Adnađević
    • 2
  • J. Jovanović
    • 3
  1. 1.Faculty of Physical Chemistry, University of Belgrade
  2. 2.Faculty of Physical Chemistry, University of Belgrade
  3. 3.Institute of Technical Sciences of the Serbian Academy of Sciences and Arts

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