Polyurethane/graphite nano-platelet composites for thermal energy storage |
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Affiliation: | 1. Vellore Institute of Technology University, Chennai Campus, India;2. Indian Institute of Technology Madras, Chennai, India;1. UEMS, Curso de Química, 79804-970, Dourados, MS, Brazil;2. UFRGS, Instituto de Química, 91501-970, Porto Alegre, RS, Brazil;3. INCT-E&A, Instituto Nacional de Ciência e Tecnologia em Energia e Meio Ambiente, Salvador, BA, Brazil;1. Environmental and Energy Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 305-343, Republic of Korea;2. Department of Environment and Energy Mechanical Engineering, University of Science and Technology, Daejeon 305-350, Republic of Korea;1. RAK Research and Innovation Center, American University of Ras Al Khaimah, Formerly CSEM-UAE Innovation Center, Ras Al Khaimah, United Arab Emirates;2. Department of Energy Technology, KTH Royal Institute of Technology, Stockholm 10044, Sweden |
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Abstract: | In this work new polyurethane-based phase change materials containing segments of poly(ethylene glycol) with average molar mass of 8000 g/mol with and without chain extender and modified with graphite nano-platelets have been fabricated and characterized. Structure, morphology and phase behaviour of these solid-solid phase change materials were investigated, as well as the thermal stability and conductivity. The heat of phase transition was in the range of 118.0–164.5 J/g for polyurethane without chain extender and 128.0–148.5 J/g for polyurethane with chain extender. The highest heat of phase transition and crystallinity were found for system modified with 0.3% of graphite nano-platelets in polyurethane without chain extender. Modulated differential scanning calorimetry results showed some changes in the phase transition behaviour and the crystallinity of the polyurethane matrix due to graphite nano-platelets confinement effect. Enhancements in the thermal stability in polyurethane modified with graphite nano-platelets, attributed to the barrier effect, were found based on thermogravimetric analysis data. The thermal conductivity increased with an increase of graphite nano-platelets content for both polyurethane systems, with and without chain extender, which is important for modern thermal energy storage applications. |
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Keywords: | Phase change materials Polyurethanes Graphite nano-platelets Thermal energy storage |
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