Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Santos, F. B. [1] ; Miranda, N. T. [1] ; Schiavon, M. I. R. B. [1] ; Fregolente, V, L. ; Maciel, M. R. Wolf [2]
Total Authors: 5
[1] Univ Estadual Campinas, Sch Chem Engn, Dept Proc & Prod Dev, BR-13083852 Campinas, SP - Brazil
[2] Fregolente, L., V, Univ Estadual Campinas, Sch Chem Engn, Dept Proc & Prod Dev, BR-13083852 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 146, n. 6, p. 2503-2514, DEC 2021.
Web of Science Citations: 3

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. (AU)

FAPESP's process: 15/20630-4 - Biorefinery development integrated to a bioethanol sugar cane plant with zero CO2 emission: routes to convert renewable resources to bio-products and bio-electricity
Grantee:Rubens Maciel Filho
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/18546-8 - Study of operating conditions for production of bio-oil and biochar from sugarcane bagasse through simulation and application in pilot plant
Grantee:Nahieh Toscano Miranda
Support type: Scholarships in Brazil - Master
FAPESP's process: 18/16269-2 - Development of beds of hydrogel for remotion of water from liquid fuels
Grantee:Fernanda Brito dos Santos
Support type: Scholarships in Brazil - Master
FAPESP's process: 17/12120-1 - Development of technology for water removal from liquid fuels using hydrogels
Grantee:Leonardo Vasconcelos Fregolente
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants