Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling
Nowadays, finding new materials with enhanced thermal insulation properties has become a mandatory task to reduce energy consumption and CO2 emissions. In recent years, nanocellular polymers have aroused great attention due to their very interesting combination of properties, which include reduced c...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522005603 |
| _version_ | 1798037031578763264 |
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| author | Ismael Sánchez-Calderón Victoria Bernardo Judith Martín-de-León Miguel Ángel Rodríguez-Pérez |
| author_facet | Ismael Sánchez-Calderón Victoria Bernardo Judith Martín-de-León Miguel Ángel Rodríguez-Pérez |
| author_sort | Ismael Sánchez-Calderón |
| collection | DOAJ |
| description | Nowadays, finding new materials with enhanced thermal insulation properties has become a mandatory task to reduce energy consumption and CO2 emissions. In recent years, nanocellular polymers have aroused great attention due to their very interesting combination of properties, which include reduced conduction through the gas phase thanks to the Knudsen effect.There are plenty of theoretical works hypothesizing the thermal insulation performance of nanocellular polymers. However, there is a lack of experimental results, especially at low densities. In the present work, the thermal conductivity of low-density microcellular and nanocellular poly(methyl-methacrylate) (PMMA) was measured to evaluate the different heat transfer mechanisms acting on these structures. PMMA foamed sheets with relative densities ranging from 0.09 to 0.18 and cell sizes between 400–4000 nm were produced by gas dissolution foaming using CO2 as a physical blowing agent. Samples were measured at various temperatures, resulting in thermal conductivities between 37.4 and 46.6 mW/(m·K) at 10 °C. Experimental results have been analyzed to build a semi-empirical model able to predict the thermal conductivity and each heat transfer mechanism contribution. To do this, a novel method to determine the solid structure factor from the slope of the thermal conductivity versus the temperature curve is introduced. |
| first_indexed | 2024-04-11T21:20:56Z |
| format | Article |
| id | doaj.art-4dd024c4308f4e7d876831b41e828fdd |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-11T21:20:56Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-4dd024c4308f4e7d876831b41e828fdd2022-12-22T04:02:37ZengElsevierMaterials & Design0264-12752022-09-01221110938Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modelingIsmael Sánchez-Calderón0Victoria Bernardo1Judith Martín-de-León2Miguel Ángel Rodríguez-Pérez3CellMat Laboratory, Campus Miguel Delibes, Faculty of Science, Condensed Matter Physics Department, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain; Corresponding author.CellMat Technologies S.L., Paseo de Belén 9-A, 47011 Valladolid, SpainCellMat Laboratory, Campus Miguel Delibes, Faculty of Science, Condensed Matter Physics Department, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, SpainCellMat Laboratory, Campus Miguel Delibes, Faculty of Science, Condensed Matter Physics Department, University of Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain; BioEcoUVA Research Institute on Bioeconomy, University of Valladolid, 47011 Valladolid, SpainNowadays, finding new materials with enhanced thermal insulation properties has become a mandatory task to reduce energy consumption and CO2 emissions. In recent years, nanocellular polymers have aroused great attention due to their very interesting combination of properties, which include reduced conduction through the gas phase thanks to the Knudsen effect.There are plenty of theoretical works hypothesizing the thermal insulation performance of nanocellular polymers. However, there is a lack of experimental results, especially at low densities. In the present work, the thermal conductivity of low-density microcellular and nanocellular poly(methyl-methacrylate) (PMMA) was measured to evaluate the different heat transfer mechanisms acting on these structures. PMMA foamed sheets with relative densities ranging from 0.09 to 0.18 and cell sizes between 400–4000 nm were produced by gas dissolution foaming using CO2 as a physical blowing agent. Samples were measured at various temperatures, resulting in thermal conductivities between 37.4 and 46.6 mW/(m·K) at 10 °C. Experimental results have been analyzed to build a semi-empirical model able to predict the thermal conductivity and each heat transfer mechanism contribution. To do this, a novel method to determine the solid structure factor from the slope of the thermal conductivity versus the temperature curve is introduced.http://www.sciencedirect.com/science/article/pii/S0264127522005603Thermal conductivityPoly(methyl-methacrylate)Microcellular polymerNanocellular polymerConductionRadiation |
| spellingShingle | Ismael Sánchez-Calderón Victoria Bernardo Judith Martín-de-León Miguel Ángel Rodríguez-Pérez Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling Materials & Design Thermal conductivity Poly(methyl-methacrylate) Microcellular polymer Nanocellular polymer Conduction Radiation |
| title | Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling |
| title_full | Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling |
| title_fullStr | Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling |
| title_full_unstemmed | Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling |
| title_short | Thermal conductivity of low-density micro-and nanocellular poly(methyl-methacrylate) (PMMA): Experimental and modeling |
| title_sort | thermal conductivity of low density micro and nanocellular poly methyl methacrylate pmma experimental and modeling |
| topic | Thermal conductivity Poly(methyl-methacrylate) Microcellular polymer Nanocellular polymer Conduction Radiation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522005603 |
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