Volume 140, Issue 3 e53343
RESEARCH ARTICLE

Effect of hardener and catalyst contents on curing and degradation of epoxidized soybean oil

Ananda K. C. Albuquerque

Ananda K. C. Albuquerque

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

Contribution: Data curation (equal), Formal analysis (equal), Methodology (equal), Writing - original draft (equal)

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Débora E. O. Almeida

Débora E. O. Almeida

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

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José V. M. Barreto

José V. M. Barreto

Materials Engineering Department, Federal University of Paraiba, João Pessoa, Brazil

Contribution: Conceptualization (lead), Funding acquisition (lead), Supervision (lead), Writing - review & editing (lead)

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Ingridy D. S. Silva

Ingridy D. S. Silva

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

Contribution: Supervision (equal), Writing - review & editing (equal)

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Nichollas G. Jaques

Nichollas G. Jaques

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

Contribution: Formal analysis (equal), Methodology (equal), Writing - original draft (equal)

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Neymara C. Nepomuceno

Neymara C. Nepomuceno

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

Contribution: Formal analysis (equal), Writing - original draft (equal)

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Eliton S. Medeiros

Eliton S. Medeiros

Materials Engineering Department, Federal University of Paraiba, João Pessoa, Brazil

Contribution: Conceptualization (equal), Formal analysis (equal), Writing - original draft (equal)

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Renate M. R. Wellen

Corresponding Author

Renate M. R. Wellen

Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande, Brazil

Materials Engineering Department, Federal University of Paraiba, João Pessoa, Brazil

Correspondence

Renate M. R. Wellen, Academic Unit of Materials Engineering, Federal University of Campina Grande, Campina Grande 58249-140, Brazil.

Email: [email protected]

Contribution: ​Investigation (equal), Writing - original draft (equal)

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First published: 08 November 2022
Citations: 1

Funding information: Conselho Nacional de Desenvolvimento Científico e Tecnológico, Grant/Award Number: 307488/2018-7; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Fundação de Apoio à Pesquisa do Estado da Paraíba, Grant/Award Number: 017/2019; Conselho Nacional de Desenvolvimento Científico e Tecnológico; Fundação de Apoio à Pesquisa do Estado da Paraíba

Abstract

Epoxidized soybean oil (ESO) compounds were cured with methyl tetrahydrophthalic anhydride (MTHPA) as hardener and 2,4,6-tris (dimethylaminomethyl) phenol (DEH 35) as catalyst. To figure out MTHPA and DEH 35's influence during curing and degradation, ESO/MTHPA/DEH 35 compounds were investigated using Fourier-Transform Infrared Spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetry (TG). FTIR spectra of uncured resin showed the secondary interactions among ESO's carbonyl groups with MTHPA and DEH 35's hydroxyls and amines. Curing progress was followed tracking the evolution of reactive groups, that is, epoxy and carbonyl bands and corroborated with released heat of DSC scans. ESO 87:5 and ESO 87:10 compounds cured using higher heating rates presented higher released enthalpy suggesting denser reticulation, and they also displayed lower activation energy E a for curing, which was evaluated using the Friedman model. Increasing the hardener and catalysts contents promoted higher thermal stability and lower degradation rates, while higher E a for degradation was verified.

CONFLICT OF INTEREST

There is no conflict of interest and all authors have agreed with this submission and they are aware of the content.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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