Thermal degradation kinetic of poly(acrylamide-co-sodium acrylate) hydrogel applying isoconversional methods

Abstract

Hydrogel of poly(acrylamide-co-sodium acrylate) may be used to remove water from liquid fuels. Synthesis, characterization, and thermal degradation kinetic are reported in this article. The hydrogel was obtained by free radical polymerization, using the acrylamide and sodium acrylate monomers. The conversion of C=C double bond of the monomers and identification of the functional groups in the structure of the polymer were confirmed by Fourier transform infrared spectroscopy. The swelling capacity in distilled water was 105.68 (g water g−1 dry hydrogel). Kinetic parameters were determined by Korsmeyer–Peppas equation, with a diffusional exponent of 0.6098 and a kinetic constant of 3.7652. TG and DSC experiments were carried out to verify the thermal stability and phase transitions, respectively. Hydrogels showed high thermal stability, with degradation at 463.15–843.15 K. The glass transition temperature was approximately 383.15 K. The thermal degradation kinetics revealed that the activation energy was approximately 500,000 J mol−1. The experimental values obtained using the Vyazovkin method were compared with the models proposed by Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose. The Kissinger method exhibited the best performance describing the activation energy values for the studied conversion range.

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Acknowledgements

The authors gratefully acknowledge the Grants #2018/16269-2, #2016/18546-8, #2017/12120-1, and #2015/20630-4, São Paulo Research Foundation (FAPESP), the National Institute of Science and Technology in Biofabrication (BIOFABRIS), and the National Council of Technological and Scientific Development (CNPq) by financial support.

Funding

This research was supported by São Paulo Research Foundation (FAPESP) (Grants #2018/16269-2, #2016/18546-8, #2017/12120-1, and #2015/20630-4), the National Institute of Science and Technology in Biofabrication (BIOFABRIS), and the National Council of Technological and Scientific Development (CNPq).

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All authors contributed to the study conception and design. Conceptualization: FBdosS. Methodology: FBdosS. Formal analysis and investigation: FBdosS, NTM, and MIRBS. Writing—original draft preparation: FBdosS and NTM. Writing—review and editing: FBdosS, NTM, MRWM, and LVF. Funding acquisition: MRWM and LVF. Resources: FBdosS. Supervision: MRWM and LVF.

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Correspondence to F. B. Santos.

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Santos, F.B., Miranda, N.T., Schiavon, M.I.R.B. et al. Thermal degradation kinetic of poly(acrylamide-co-sodium acrylate) hydrogel applying isoconversional methods. J Therm Anal Calorim (2020). https://doi.org/10.1007/s10973-020-09899-y

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Keywords

  • Hydrogel
  • Thermal degradation kinetic
  • Flynn–Wall–Ozawa
  • Kissinger–Akahira–Sunose
  • Poly(acrylamide-co-sodium acrylate)