Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy
Microencapsulated phase-change material (ME-PCM) employing octadecane as a core material has been practiced for thermal-energy-storage (TES) applications in buildings. However, octadecane as a hydrocarbon-based PCM is flammable. Herein, silica-shelled microcapsules (SiO2-MCs) and poly(urea-formaldeh...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/160573 |
| _version_ | 1826115661462503424 |
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| author | Hu, Zhong-Ting Reinack, Varghese Hansen An, Jinliang Indraneel, Zope Dasari, Aravind Yang, Jinglei Yang, En-Hua |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Hu, Zhong-Ting Reinack, Varghese Hansen An, Jinliang Indraneel, Zope Dasari, Aravind Yang, Jinglei Yang, En-Hua |
| author_sort | Hu, Zhong-Ting |
| collection | NTU |
| description | Microencapsulated phase-change material (ME-PCM) employing octadecane as a core material has been practiced for thermal-energy-storage (TES) applications in buildings. However, octadecane as a hydrocarbon-based PCM is flammable. Herein, silica-shelled microcapsules (SiO2-MCs) and poly(urea-formaldehyde)-shelled microcapsules (PUF-MCs) were successfully prepared, loaded with octadecane/tributyl phosphate (TBP) as hybrid core materials, which not only exhibited good TES properties but also high-effective flame retardancy. SiO2-MC (ΔHm = 124.6 J g-1 and ΔHc = 124.1 J g-1) showed weaker TES capacity than PUF-MC (ΔHm = 186.8 J g-1, ΔHc = 188.5 J g-1) but better flame retardancy with a lower peak heat-release rate (HRRpeak) of 460.9 W g-1 (556.9 W g-1 for PUF-MCs). As compared with octadecane (38.7 kJ g-1), the reduction in total heat release (THR) for SiO2-MC was up to 22% (30.1 kJ g-1) with combustion time shortened by 1/6. SiO2-MC had a typical diameter of 150-210 μm, shell thickness of ∼6.5 μm, and a core fraction of 84 wt %. SiO2-MC showed better thermal stability with a higher initial evaporation/pyrolysis temperature than PUF-MC. The thermal decomposition of MCs with its mechanism of flame retardancy was significantly studied using thermogravimetric analysis/infrared spectrometry (TG-IR). The strategy presented in this study should inspire the development of microcapsules with PCMs/flame retardants as hybrid core materials for structural applications. |
| first_indexed | 2024-10-01T03:58:47Z |
| format | Journal Article |
| id | ntu-10356/160573 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:58:47Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1605732022-07-27T01:06:38Z Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy Hu, Zhong-Ting Reinack, Varghese Hansen An, Jinliang Indraneel, Zope Dasari, Aravind Yang, Jinglei Yang, En-Hua School of Civil and Environmental Engineering School of Materials Science and Engineering Engineering::Civil engineering Engineering::Materials Pharmaceuticals Polymer Science Microencapsulated phase-change material (ME-PCM) employing octadecane as a core material has been practiced for thermal-energy-storage (TES) applications in buildings. However, octadecane as a hydrocarbon-based PCM is flammable. Herein, silica-shelled microcapsules (SiO2-MCs) and poly(urea-formaldehyde)-shelled microcapsules (PUF-MCs) were successfully prepared, loaded with octadecane/tributyl phosphate (TBP) as hybrid core materials, which not only exhibited good TES properties but also high-effective flame retardancy. SiO2-MC (ΔHm = 124.6 J g-1 and ΔHc = 124.1 J g-1) showed weaker TES capacity than PUF-MC (ΔHm = 186.8 J g-1, ΔHc = 188.5 J g-1) but better flame retardancy with a lower peak heat-release rate (HRRpeak) of 460.9 W g-1 (556.9 W g-1 for PUF-MCs). As compared with octadecane (38.7 kJ g-1), the reduction in total heat release (THR) for SiO2-MC was up to 22% (30.1 kJ g-1) with combustion time shortened by 1/6. SiO2-MC had a typical diameter of 150-210 μm, shell thickness of ∼6.5 μm, and a core fraction of 84 wt %. SiO2-MC showed better thermal stability with a higher initial evaporation/pyrolysis temperature than PUF-MC. The thermal decomposition of MCs with its mechanism of flame retardancy was significantly studied using thermogravimetric analysis/infrared spectrometry (TG-IR). The strategy presented in this study should inspire the development of microcapsules with PCMs/flame retardants as hybrid core materials for structural applications. Agency for Science, Technology and Research (A*STAR) Ministry of National Development (MND) The authors would like to acknowledge financial support from the Agency for Science, Technology and Research (A*STAR) -- Ministry of National Development (MND), Singapore (SERC132 176 0014). 2022-07-27T01:06:38Z 2022-07-27T01:06:38Z 2021 Journal Article Hu, Z., Reinack, V. H., An, J., Indraneel, Z., Dasari, A., Yang, J. & Yang, E. (2021). Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy. Langmuir, 37(21), 6380-6387. https://dx.doi.org/10.1021/acs.langmuir.0c03587 0743-7463 https://hdl.handle.net/10356/160573 10.1021/acs.langmuir.0c03587 34000193 2-s2.0-85107391195 21 37 6380 6387 en SERC132 176 0014 Langmuir © 2021 American Chemical Society. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Engineering::Materials Pharmaceuticals Polymer Science Hu, Zhong-Ting Reinack, Varghese Hansen An, Jinliang Indraneel, Zope Dasari, Aravind Yang, Jinglei Yang, En-Hua Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title | Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title_full | Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title_fullStr | Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title_full_unstemmed | Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title_short | Ecofriendly microencapsulated phase-change materials with hybrid core materials for thermal energy storage and flame retardancy |
| title_sort | ecofriendly microencapsulated phase change materials with hybrid core materials for thermal energy storage and flame retardancy |
| topic | Engineering::Civil engineering Engineering::Materials Pharmaceuticals Polymer Science |
| url | https://hdl.handle.net/10356/160573 |
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