Shape-Stabilized Phase Change Material by a Synthetic/Natural Hybrid Composite Foam with Cell-Wall Pores
- Authors
- Zhang, X.; Kim, Yunsang; Kim, Dongsu; Liu, M.; Erramuspe, I.B.V.; Kaya, G.B.; Wang, X.; Kim, TaeYoung; Via, B.K.; Cho, Heejin
- Issue Date
- Jan-2021
- Publisher
- American Chemical Society
- Keywords
- building energy; cell-wall pores; rigid polyurethane foams; shape-stabilized PCM; thermal energy-storage materials
- Citation
- ACS Applied Energy Materials, v.4, no.1, pp.416 - 424
- Journal Title
- ACS Applied Energy Materials
- Volume
- 4
- Number
- 1
- Start Page
- 416
- End Page
- 424
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80406
- DOI
- 10.1021/acsaem.0c02341
- ISSN
- 2574-0962
- Abstract
- Improving energy efficiency of buildings reduces energy costs and helps meet the ever increasing world energy demand. Innovative building design requires high-performance structural materials with mechanical integrity, energy efficiency, and sustainability. Here, we report a polyurethane/lignin hybrid structural composite with cell-wall pores for the shape stabilization of an organic phase change material (PCM) as an active energy component in buildings. Sub-50 μm pores on the cell wall of the lignin-based rigid polyurethane (LRPU) foam, which were barely seen in ordinary RPU foams, enabled the very high loading and retention of n-eicosane as the organic PCM, yielding a PCM loading of 93% with negligible loss after extensive drying at 80 °C for 25 days. After 253 cycles of heating and cooling between 10 and 70 °C, the PCM-LRPU composite foams exhibited 213.8 and 205.8 J/g as stored and released energy, respectively. The compressive strength of PCM-LRPU composite foams was found to be 1460 kPa at 10% strain, which outperformed the required compressive strength of polyurethane insulation in structural panels. The thermal profile analysis of PCM-LRPU foams as a model-building envelope confirmed the excellent thermal performance of the hybrid composite foams, which would reduce the temperature fluctuation and peak energy demand of buildings. This rigid, synthetic/natural hybrid composite foam with the cell-wall pores in a closed-cell structure would be useful for shape-stabilized PCM serving not only as thermal energy storage but also as loading-bearing components in buildings. © 2020 American Chemical Society.
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