Elastocaloric effect dependence on pre-elongation in natural rubber

Abstract : In the context of solid-state-cooling, the elastocaloric effect offers a very large controlled entropy change based in low-cost polymers, especially natural rubber which is environmentally friendly. However, large elastocaloric activity requires large elongation (>5), which makes this material impractical for cooling systems due to the large change in sample's area. By performing a pre-elongation, area change is limited, and β = - γ / λ (where γ is the specific entropy and λ is the elongation) is larger. The highest β value is obtained when pre-elongation is right before (at the "eve") the onset of the strain-induced crystallization, which is also interpreted in the view of molecular conformation. Experimental results obtained on a natural rubber sample showed an adiabatic temperature change of 4.3°C for pre-elongation of 4 with further elongation of 4 (true strain change of 69%). Furthermore, the entropy exhibits a quasi-linear dependence on elongation, and the β value is found to be 6400 J K-1 m-3. © 2015 AIP Publishing LLC.
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Z. Xie, G. Sebald, D. Guyomar. Elastocaloric effect dependence on pre-elongation in natural rubber. Applied Physics Letters, American Institute of Physics, 2015, 107 (8), ⟨10.1063/1.4929395⟩. ⟨hal-01769266⟩



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