The effects of functional nanofillers on the reaction kinetics, microstructure, thermal and mechanical properties of water blown rigid polyurethane foams
The use of functional nanofillers to improve the properties of rigid polyurethane (PU) foams has caused the need for a better understanding of how these nanofillers modify the reaction kinetic of the PU system. In this study, different nanoclays and nanosilicas are used as functional nanofillers. An...
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| Published in | Polymer (Guilford) Vol. 150; pp. 138 - 149 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
15.08.2018
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| Abstract | The use of functional nanofillers to improve the properties of rigid polyurethane (PU) foams has caused the need for a better understanding of how these nanofillers modify the reaction kinetic of the PU system. In this study, different nanoclays and nanosilicas are used as functional nanofillers. Analysis of the kinetic data obtained by in-situ FTIR spectroscopy monitoring allows to correlate the isocyanate consumption with the type of nanoparticles. The quantification of urethane and urea, obtained by deconvolution of the carbonyl region absorptions, enables to follow the blowing and gelling reactions during the foaming process. These reactions are correlated to the nature of the chemical groups present on the surface of the nanoparticles added. In addition, the effect of the modification of the reaction kinetics on the density, cellular structure, thermal conductivity and mechanical properties is herein discussed.
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•Rigid polyurethane foams reinforced with nanofillers (nanoclays or nanosilicas) are produced and characterized.•The effect of nanofillers on polyurethane reaction kinetics is evaluated by FTIR spectroscopy.•The effect of the reaction kinetics on the microstructure and physical properties is discussed.•Nanoparticles modify both the reaction kinetics and foaming mechanisms affecting the final physical properties. |
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| AbstractList | The use of functional nanofillers to improve the properties of rigid polyurethane (PU) foams has caused the need for a better understanding of how these nanofillers modify the reaction kinetic of the PU system. In this study, different nanoclays and nanosilicas are used as functional nanofillers. Analysis of the kinetic data obtained by in-situ FTIR spectroscopy monitoring allows to correlate the isocyanate consumption with the type of nanoparticles. The quantification of urethane and urea, obtained by deconvolution of the carbonyl region absorptions, enables to follow the blowing and gelling reactions during the foaming process. These reactions are correlated to the nature of the chemical groups present on the surface of the nanoparticles added. In addition, the effect of the modification of the reaction kinetics on the density, cellular structure, thermal conductivity and mechanical properties is herein discussed.
[Display omitted]
•Rigid polyurethane foams reinforced with nanofillers (nanoclays or nanosilicas) are produced and characterized.•The effect of nanofillers on polyurethane reaction kinetics is evaluated by FTIR spectroscopy.•The effect of the reaction kinetics on the microstructure and physical properties is discussed.•Nanoparticles modify both the reaction kinetics and foaming mechanisms affecting the final physical properties. |
| Author | Rodríguez-Pérez, Miguel Ángel Villafañe, Fernando Ruiz-Herrero, José Luis Santiago-Calvo, Mercedes Tirado-Mediavilla, Josías |
| Author_xml | – sequence: 1 givenname: Mercedes surname: Santiago-Calvo fullname: Santiago-Calvo, Mercedes email: mercesc@fmc.uva.es organization: Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, University of Valladolid, Campus Miguel Delibes, Paseo de Belén 7, 47011 Valladolid, Spain – sequence: 2 givenname: Josías surname: Tirado-Mediavilla fullname: Tirado-Mediavilla, Josías organization: Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, University of Valladolid, Campus Miguel Delibes, Paseo de Belén 7, 47011 Valladolid, Spain – sequence: 3 givenname: José Luis surname: Ruiz-Herrero fullname: Ruiz-Herrero, José Luis organization: Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, University of Valladolid, Campus Miguel Delibes, Paseo de Belén 7, 47011 Valladolid, Spain – sequence: 4 givenname: Miguel Ángel surname: Rodríguez-Pérez fullname: Rodríguez-Pérez, Miguel Ángel organization: Cellular Materials Laboratory (CellMat), Condensed Matter Physics Department, Faculty of Science, University of Valladolid, Campus Miguel Delibes, Paseo de Belén 7, 47011 Valladolid, Spain – sequence: 5 givenname: Fernando surname: Villafañe fullname: Villafañe, Fernando organization: GIR MIOMeT-IU Cinquima-Química Inorgánica, Faculty of Science, University of Valladolid, Campus Miguel Delibes, Paseo de Belén 7, 47011 Valladolid, Spain |
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| Keywords | Thermal properties Mechanical properties Nanoclay Nanosilica Reaction kinetics Polyurethane foam |
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| SubjectTerms | Mechanical properties Nanoclay Nanosilica Polyurethane foam Reaction kinetics Thermal properties |
| Title | The effects of functional nanofillers on the reaction kinetics, microstructure, thermal and mechanical properties of water blown rigid polyurethane foams |
| URI | https://dx.doi.org/10.1016/j.polymer.2018.07.029 |
| Volume | 150 |
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