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Thermally conductive phase-change materials for energy storage based on low-density polyethylene, soft Fischer–Tropsch wax and graphite

Mhike, W. ; Focke, W.W. ; Mofokeng, J.P. ; Luyt, A.S.

Thermochimica acta, 2012-01, Vol.527 (10), p.75-82 [Periódico revisado por pares]

Oxford: Elsevier B.V

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  • Título:
    Thermally conductive phase-change materials for energy storage based on low-density polyethylene, soft Fischer–Tropsch wax and graphite
  • Autor: Mhike, W. ; Focke, W.W. ; Mofokeng, J.P. ; Luyt, A.S.
  • Assuntos: Cross-disciplinary physics: materials science; rheology ; Degradation ; energy ; Exact sciences and technology ; Expanded graphite ; graphene ; Graphite ; Heat transfer ; LDPE ; Materials science ; melting point ; Other topics in materials science ; Paraffin wax ; phase transition ; Phase-change material ; Physics ; polyethylene ; Polyethylenes ; Polymer blends ; Screws ; Softening ; temperature ; Thermal conductivity ; Thermal properties ; Thermomechanical properties
  • É parte de: Thermochimica acta, 2012-01, Vol.527 (10), p.75-82
  • Notas: http://dx.doi.org/10.1016/j.tca.2011.10.008
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  • Descrição: ► 200% increase in thermal conductivity for wax/LDPE with 10 wt.% exfoliated graphite. ► Wax or LDPE does not influence degradation of other component – graphite slows down degradation. ► Presence of graphite does not affect melting and crystallization behaviour of wax or LDPE. ► DMA results indicate that wax softens but graphite reinforces wax/LDPE/graphite blend composites. Phase change materials based on graphite-filled wax/polyethylene blends could find application as thermal energy storage materials. Such compounds, comprising wax to polyethylene in a 3:2 proportion, were prepared by twin screw compounding. Two types of graphite were used in an attempt to improve the thermal conductivity of the compounds. Expanded graphite enhanced the thermal conductivity by more than 200% at a loading of 10 wt.%, compared to a ca. 60% improvement with natural graphite flakes at the same loading. The TGA results showed that all the compounds underwent a two-step degradation. In all cases the mass % ratios of the two degradation steps were roughly 3:2 for wax:LDPE, which confirms that the wax evaporated completely before the degradation of LDPE started. The DSC results suggest that the heat energy storing capacity of the wax is not influenced by the other components as long as heating is restricted to temperatures just above the melting point of the wax. It is also apparent that the presence of both forms of graphite enhanced the rate of heat transfer to the PCMs. The DMA results show that the presence of wax had a softening effect, while the presence of graphite opposed this softening effect by reinforcing the PCM composites.
  • Editor: Oxford: Elsevier B.V
  • Idioma: Inglês;Holandês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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