On the mechanocaloric effect of natural graphite/thermoplastic polyurethane composites.

Autor: Colman, Flávio Clareth, da Silva, Nicholas Dicati Pereira, Imamura, William, Usuda, Erik Oda, Moro, Fernando Rodrigo, Carvalho, Alexandre Magnus Gomes, Alves, Cleber Santiago, Trevizoli, Paulo Vinícius, de Cássia Colman Simões, Rita, de Oliveira, Júlio César Dainezi, Favaro, Silvia Luciana, Bocca, Jean Rodrigo, Radovanovic, Eduardo
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Zdroj: Journal of Materials Science; Jul2023, Vol. 58 Issue 27, p11029-11043, 15p, 1 Diagram, 8 Graphs
Abstrakt: Solid-state cooling based on caloric effects is an alternative to traditional vapor-compression refrigeration systems. This technique and the solid-state materials have received great attention in recent decades. For example, the elastomers are promising because they have high values of adiabatic temperature change (ΔTS) and isothermal entropy change (ΔST). However, their thermal conductivity is limited, which is a fundamental property for heat transfer. Hence, in this work, we characterized the mechanocaloric effect in natural graphite/thermoplastic polyurethane (NG/TPU) composites. The pure TPU and its NG/TPU composites were characterized by their thermal and mechanical properties. The NG/TPU composites presented ΔTS = 8.6 K and ΔST = 35 J kg−1 K−1, which correspond to a maximum reduction of 28 and 45% in the ΔTS and ΔST, respectively, when compared to pure TPU, but with an increase of 500% in thermal conductivity. We reported no significant reduction in the ΔTS for the composites after 105 compression cycles. Our findings combine a large mechanocaloric effect with the unique characteristics of TPUs and the enhanced thermal conductivity of its NG/TPU composites. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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