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Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin

The hyperbranched epoxy resins (HBE) composed of bisphenol A (BPA) and polyethylene glycol (PEG) as reactants and pentaerythritol as branching point were successfully synthesized via A(2) + B(4) polycondensation reaction at various BPA/PEG ratios. The (13)C NMR spectra revealed that the synthesized...

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Autores principales: Boonlert-uthai, Tossapol, Samthong, Chavakorn, Somwangthanaroj, Anongnat
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835430/
https://www.ncbi.nlm.nih.gov/pubmed/31547552
http://dx.doi.org/10.3390/polym11101545
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author Boonlert-uthai, Tossapol
Samthong, Chavakorn
Somwangthanaroj, Anongnat
author_facet Boonlert-uthai, Tossapol
Samthong, Chavakorn
Somwangthanaroj, Anongnat
author_sort Boonlert-uthai, Tossapol
collection PubMed
description The hyperbranched epoxy resins (HBE) composed of bisphenol A (BPA) and polyethylene glycol (PEG) as reactants and pentaerythritol as branching point were successfully synthesized via A(2) + B(4) polycondensation reaction at various BPA/PEG ratios. The (13)C NMR spectra revealed that the synthesized HBE mainly had a dendritic structure as confirmed by the high degree of branching (DB). The addition of PEG in the resin enhanced degree of branching (DB) (from 0.82 to 0.90), epoxy equivalent weight (EEW) (from 697 g eq(−1) to 468 g eq(−1)) as well as curing reaction. Adding 5–10 wt.% PEG in the resin decreased the onset and peak curing temperatures and glass transition temperature; however, adding 15 wt.% PEG in the resin have increased these thermal properties due to the lowest EEW. The curing kinetics were evaluated by fitting the experimental data of the curing behavior of all resins with the Šesták–Berggren equation. The activation energy increased with the increase of PEG in the resins due to HBE’s steric hindrance, whereas the activation energy of HBE15P decreased due to a large amount of equivalent active epoxy group per mass sample. The curing behavior and thermal properties of obtained hyperbranched BPA/PEG epoxy resin would be suitable for using in electronics application.
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spelling pubmed-68354302019-11-25 Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin Boonlert-uthai, Tossapol Samthong, Chavakorn Somwangthanaroj, Anongnat Polymers (Basel) Article The hyperbranched epoxy resins (HBE) composed of bisphenol A (BPA) and polyethylene glycol (PEG) as reactants and pentaerythritol as branching point were successfully synthesized via A(2) + B(4) polycondensation reaction at various BPA/PEG ratios. The (13)C NMR spectra revealed that the synthesized HBE mainly had a dendritic structure as confirmed by the high degree of branching (DB). The addition of PEG in the resin enhanced degree of branching (DB) (from 0.82 to 0.90), epoxy equivalent weight (EEW) (from 697 g eq(−1) to 468 g eq(−1)) as well as curing reaction. Adding 5–10 wt.% PEG in the resin decreased the onset and peak curing temperatures and glass transition temperature; however, adding 15 wt.% PEG in the resin have increased these thermal properties due to the lowest EEW. The curing kinetics were evaluated by fitting the experimental data of the curing behavior of all resins with the Šesták–Berggren equation. The activation energy increased with the increase of PEG in the resins due to HBE’s steric hindrance, whereas the activation energy of HBE15P decreased due to a large amount of equivalent active epoxy group per mass sample. The curing behavior and thermal properties of obtained hyperbranched BPA/PEG epoxy resin would be suitable for using in electronics application. MDPI 2019-09-23 /pmc/articles/PMC6835430/ /pubmed/31547552 http://dx.doi.org/10.3390/polym11101545 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Boonlert-uthai, Tossapol
Samthong, Chavakorn
Somwangthanaroj, Anongnat
Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title_full Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title_fullStr Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title_full_unstemmed Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title_short Synthesis, Thermal Properties and Curing Kinetics of Hyperbranched BPA/PEG Epoxy Resin
title_sort synthesis, thermal properties and curing kinetics of hyperbranched bpa/peg epoxy resin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835430/
https://www.ncbi.nlm.nih.gov/pubmed/31547552
http://dx.doi.org/10.3390/polym11101545
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