Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging
Graphene oxide addition to epoxy still presents challenges related to attaining optimized dispersion in scale-up production. Herein, the synthesis of high-quality GO by exfoliation in ethanol enabled the spontaneous phase transfer of GO from solvent to epoxy resin to produce a masterbatch with 1.5 w...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Composites Part C: Open Access |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666682022001037 |
| _version_ | 1811155502730575872 |
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| author | Taiza M.C. dos Reis Vinicius G. de Castro Leice G. Amurin Glaura G. Silva |
| author_facet | Taiza M.C. dos Reis Vinicius G. de Castro Leice G. Amurin Glaura G. Silva |
| author_sort | Taiza M.C. dos Reis |
| collection | DOAJ |
| description | Graphene oxide addition to epoxy still presents challenges related to attaining optimized dispersion in scale-up production. Herein, the synthesis of high-quality GO by exfoliation in ethanol enabled the spontaneous phase transfer of GO from solvent to epoxy resin to produce a masterbatch with 1.5 wt.% GO content. Nanocomposites with 0.25 wt.%, 0.50 wt.% and 0.75 wt.% nanofiller contents were obtained by masterbatch dilution in epoxy resin. The results reveal the presence of a partial cross-linked network in these nanocomposites associated with the presence of GO, even without the use of a hardener. Thermogravimetric analysis showed the influence of GO on the oxidative decomposition mechanism of epoxy resin, whose behavior was assigned to strong interactions in the GO-epoxy interphase. Furthermore, the rheological behavior changes demonstrate the high quality of the GO dispersion in the resin obtained in this work. The nanocomposites showed high viscosity increases over time and pseudoplastic behavior, which was completely different from the neat epoxy resin. Aged nanocomposites without hardener present a first chemically cross-linked layer of epoxy to GO (∼ 10% for nanocomposite at 0.50 wt.% GO content) and a supramolecular coating interacting and entangled with these structures (> 40% of epoxy chains for EP-GO50). |
| first_indexed | 2024-04-10T04:34:29Z |
| format | Article |
| id | doaj.art-a310b2b37b7446d89d83a233d62214b5 |
| institution | Directory Open Access Journal |
| issn | 2666-6820 |
| language | English |
| last_indexed | 2024-04-10T04:34:29Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Composites Part C: Open Access |
| spelling | doaj.art-a310b2b37b7446d89d83a233d62214b52023-03-10T04:36:38ZengElsevierComposites Part C: Open Access2666-68202023-03-0110100340Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and agingTaiza M.C. dos Reis0Vinicius G. de Castro1Leice G. Amurin2Glaura G. Silva3Technology Center in nanomaterials and graphene (CTNano/UFMG), Minas Gerais, Belo Horizonte, Brazil; Federal University of Minas Gerais (UFMG), Minas Gerais, Belo Horizonte, BrazilTechnology Center in nanomaterials and graphene (CTNano/UFMG), Minas Gerais, Belo Horizonte, Brazil; Federal University of Minas Gerais (UFMG), Minas Gerais, Belo Horizonte, BrazilTechnology Center in nanomaterials and graphene (CTNano/UFMG), Minas Gerais, Belo Horizonte, BrazilTechnology Center in nanomaterials and graphene (CTNano/UFMG), Minas Gerais, Belo Horizonte, Brazil; Federal University of Minas Gerais (UFMG), Minas Gerais, Belo Horizonte, Brazil; Corresponding author at: CTNano/UFMG, Rua Professor José Vieira de Mendonça, n° 520 - Engenho Nogueira, Belo Horizonte, MG, 31310-260, BrazilGraphene oxide addition to epoxy still presents challenges related to attaining optimized dispersion in scale-up production. Herein, the synthesis of high-quality GO by exfoliation in ethanol enabled the spontaneous phase transfer of GO from solvent to epoxy resin to produce a masterbatch with 1.5 wt.% GO content. Nanocomposites with 0.25 wt.%, 0.50 wt.% and 0.75 wt.% nanofiller contents were obtained by masterbatch dilution in epoxy resin. The results reveal the presence of a partial cross-linked network in these nanocomposites associated with the presence of GO, even without the use of a hardener. Thermogravimetric analysis showed the influence of GO on the oxidative decomposition mechanism of epoxy resin, whose behavior was assigned to strong interactions in the GO-epoxy interphase. Furthermore, the rheological behavior changes demonstrate the high quality of the GO dispersion in the resin obtained in this work. The nanocomposites showed high viscosity increases over time and pseudoplastic behavior, which was completely different from the neat epoxy resin. Aged nanocomposites without hardener present a first chemically cross-linked layer of epoxy to GO (∼ 10% for nanocomposite at 0.50 wt.% GO content) and a supramolecular coating interacting and entangled with these structures (> 40% of epoxy chains for EP-GO50).http://www.sciencedirect.com/science/article/pii/S2666682022001037Epoxy resinGraphene oxidePhase transferNanocompositeRheological properties |
| spellingShingle | Taiza M.C. dos Reis Vinicius G. de Castro Leice G. Amurin Glaura G. Silva Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging Composites Part C: Open Access Epoxy resin Graphene oxide Phase transfer Nanocomposite Rheological properties |
| title | Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging |
| title_full | Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging |
| title_fullStr | Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging |
| title_full_unstemmed | Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging |
| title_short | Graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol: Rheology and aging |
| title_sort | graphene oxide dispersion in epoxy resin prepared by direct phase transfer from ethanol rheology and aging |
| topic | Epoxy resin Graphene oxide Phase transfer Nanocomposite Rheological properties |
| url | http://www.sciencedirect.com/science/article/pii/S2666682022001037 |
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