Large barocaloric effects at low pressures in natural rubber

Abstract

Barocaloric effect in vulcanized natural rubber (V-NR) has been investigated. Direct measurements of the temperature change (ΔT) around room temperature (283-333 K) resulted in large values, above 10 K, for a pressure change of 173 MPa. A power law was proposed to fit ΔT as function of the maximum pressure, showing to be suitable for the barocaloric effect in V-NR. Strain was measured as a function of temperature at constant pressures in order to obtain the isothermal entropy change (ΔST). At 293 K, we obtained a ΔST of 21 J.kg-1K-1 for a pressure change of only 43.4 MPa. The results presented in this work are compared with those reported recently for PVDF-TrFE-CTFE polymer, showing a better barocaloric performance for V-NR in similar temperature and pressure ranges. These findings evidence the high potential of V-NR for application in solid-state refrigeration based on confined compression, opening new possibilities for i-caloric materials.

15 pages, 6 figures, 1 table. Correction of Figure 5 and COP value

References in corpus (5)

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Cited by in corpus (5)

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• Pressure dependence of atomic dynamics in barocaloric ammonium sulfate: I. Rotations
• A Novel Option for Waste Tire Rubber Reutilization: Refrigerant in Solid-State Cooling Devices