Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite
In the present study, a promising flame retardant consisting of 80 wt% silane-modified nanosepiolites functionalized with 20 wt% graphite (SFG) is used to obtain a synergistic effect principally focussed on the thermal stability of water-blown rigid polyurethane (RPU) foams. Density, microcellular s...
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MDPI AG
2022-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/1/381 |
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| author | Mercedes Santiago-Calvo María Carracedo-Pérez María Luisa Puertas Antonio Esteban-Cubillo Julio Santaren Fernando Villafañe Miguel-Ángel Rodríguez-Pérez |
| author_facet | Mercedes Santiago-Calvo María Carracedo-Pérez María Luisa Puertas Antonio Esteban-Cubillo Julio Santaren Fernando Villafañe Miguel-Ángel Rodríguez-Pérez |
| author_sort | Mercedes Santiago-Calvo |
| collection | DOAJ |
| description | In the present study, a promising flame retardant consisting of 80 wt% silane-modified nanosepiolites functionalized with 20 wt% graphite (SFG) is used to obtain a synergistic effect principally focussed on the thermal stability of water-blown rigid polyurethane (RPU) foams. Density, microcellular structure, thermal stability and thermal conductivity are examined for RPU foams reinforced with different contents of SFG (0, as reference material, 2, 4 and 6 wt%). The sample with 6 wt% SFG presents a slightly thermal stability improvement, although its cellular structure is deteriorated in comparison with the reference material. Furthermore, the influence of SFG particles on chemical reactions during the foaming process is studied by FTIR spectroscopy. The information obtained from the chemical reactions and from isocyanate consumption is used to optimize the formulation of the foam with 6 wt% SFG. Additionally, in order to determine the effects of functionalization on SFG, foams containing only silane-modified nanosepiolites, only graphite, or silane-modified nanosepiolites and graphite added separately are studied here as well. In conclusion, the inclusion of SFG in RPU foams allows the best performance to be achieved. |
| first_indexed | 2024-03-10T03:33:08Z |
| format | Article |
| id | doaj.art-bb71d4cc1ec347a1b9bb1eedd22e5045 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:33:08Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-bb71d4cc1ec347a1b9bb1eedd22e50452023-11-23T11:52:22ZengMDPI AGMaterials1996-19442022-01-0115138110.3390/ma15010381Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with GraphiteMercedes Santiago-Calvo0María Carracedo-Pérez1María Luisa Puertas2Antonio Esteban-Cubillo3Julio Santaren4Fernando Villafañe5Miguel-Ángel Rodríguez-Pérez6Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, Campus Miguel Delibes, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, SpainCellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, Campus Miguel Delibes, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, SpainResearch and Development Department, Tolsa S. A., Carretera de Madrid a Rivas Jarama, 35, 28031 Madrid, SpainResearch and Development Department, Tolsa S. A., Carretera de Madrid a Rivas Jarama, 35, 28031 Madrid, SpainResearch and Development Department, Tolsa S. A., Carretera de Madrid a Rivas Jarama, 35, 28031 Madrid, SpainGIR MIOMeT-IU Cinquima-Química Inorgánica, Faculty of Science, Campus Miguel Delibes, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, SpainCellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, Campus Miguel Delibes, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, SpainIn the present study, a promising flame retardant consisting of 80 wt% silane-modified nanosepiolites functionalized with 20 wt% graphite (SFG) is used to obtain a synergistic effect principally focussed on the thermal stability of water-blown rigid polyurethane (RPU) foams. Density, microcellular structure, thermal stability and thermal conductivity are examined for RPU foams reinforced with different contents of SFG (0, as reference material, 2, 4 and 6 wt%). The sample with 6 wt% SFG presents a slightly thermal stability improvement, although its cellular structure is deteriorated in comparison with the reference material. Furthermore, the influence of SFG particles on chemical reactions during the foaming process is studied by FTIR spectroscopy. The information obtained from the chemical reactions and from isocyanate consumption is used to optimize the formulation of the foam with 6 wt% SFG. Additionally, in order to determine the effects of functionalization on SFG, foams containing only silane-modified nanosepiolites, only graphite, or silane-modified nanosepiolites and graphite added separately are studied here as well. In conclusion, the inclusion of SFG in RPU foams allows the best performance to be achieved.https://www.mdpi.com/1996-1944/15/1/381flame retardantpolyurethane foamthermal stabilitynanosepiolitesgraphite |
| spellingShingle | Mercedes Santiago-Calvo María Carracedo-Pérez María Luisa Puertas Antonio Esteban-Cubillo Julio Santaren Fernando Villafañe Miguel-Ángel Rodríguez-Pérez Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite Materials flame retardant polyurethane foam thermal stability nanosepiolites graphite |
| title | Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite |
| title_full | Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite |
| title_fullStr | Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite |
| title_full_unstemmed | Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite |
| title_short | Characterization and Properties of Water-Blown Rigid Polyurethane Foams Reinforced with Silane-Modified Nanosepiolites Functionalized with Graphite |
| title_sort | characterization and properties of water blown rigid polyurethane foams reinforced with silane modified nanosepiolites functionalized with graphite |
| topic | flame retardant polyurethane foam thermal stability nanosepiolites graphite |
| url | https://www.mdpi.com/1996-1944/15/1/381 |
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