  Elastomers have shown to be promising barocaloric materials, being suitable
candidates for solid-state cooling devices. Moreover, this family of polymers
presents additional advantages, such as their low cost and long fatigue life.
In this context, we investigated the barocaloric effects in Nitrile Butadiene
Rubber (NBR) in a large range around room temperature. Moderated applied
pressures on NBR yield giant temperature change ({\Delta}TS) and entropy change
({\Delta}ST), reaching the maximum values of 16.4(2) K at 323 K and 59(6) J
kg-1K-1 at 314 K, respectively, for a pressure change of 390 MPa. Besides, both
{\Delta}TS and {\Delta}ST have shown to be rather reversible. An influence of
the glass transition on the barocaloric effects was verified: the glassy state
tends to diminish the entropy and temperature changes in comparison with the
rubbery state. Furthermore, we calculated the pressure coefficient of glass
transition (dTg/dP) obtained from different processes. Our study evidences the
potential of NBR for cooling applications based on barocaloric effect, but also
points out the glass transition must be avoided for a better barocaloric
performance.
