Elastocaloric effect dependence on pre-elongation in natural rubber

Xie, Zhongjian; Sebald, Gaël; Guyomar, Daniel

doi:10.1063/1.4929395

Cited by 53 publications

(45 citation statements)

References 39 publications

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“…For σb-CE, however, a detailed description of the physico-chemical mechanisms associated to the observed ∆T is still missing, and further studies are necessary to unravel this question. Moreover, no abrupt changes in |ΔT| are verified as temperature increases, indicating the absence of SIC or other phase transitions, differently from what was previously reported in mechanocaloric studies with V-NR [27,28] and PVDF-polymers [30]. Furthermore, around room temperature, the ∆T values observed in our data set for 173 MPa are significantly higher than those obtained for σb-CE in PVDF-TrFE-CTFE at similar pressures, as showed in Table 1.…”

Section: Methodscontrasting

confidence: 87%

Large barocaloric effects at low pressures in natural rubber

Usuda

Bom

Carvalho

2017

European Polymer Journal

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Barocaloric effect in vulcanized natural rubber (V-NR) has been investigated. Direct measurements of the temperature change ({\Delta}T) 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 {\Delta}T 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 ({\Delta}ST). At 293 K, we obtained a {\Delta}ST 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.Comment: 15 pages, 6 figures, 1 tabl

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Section: Methodscontrasting

confidence: 87%

Large barocaloric effects at low pressures in natural rubber

Usuda

Bom

Carvalho

2017

European Polymer Journal

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“…Alternatively to ferroics, elastomeric polymers have also attracted some attention regarding the σ-CE [17][18][19][20][21][22][23]. Elastomers have shown to be particularly suitable for mechanocaloric applications, since they present good fatigue properties combined with high caloric potential [24].…”

Section: Introductionmentioning

confidence: 99%

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Carvalho

Imamura

Usuda

et al. 2018

European Polymer Journal

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The barocaloric effect is still an incipient scientific topic, but it has been attracting an increasing attention in the last years due to the promising perspectives for its application in alternative cooling devices. Here, we present giant values of barocaloric entropy change and temperature change induced by low pressures in PDMS elastomer around room temperature.Adiabatic temperature changes of 12.0 K and 28.5 K were directly measured for pressure changes of 173 MPa and 390 MPa, respectively, associated with large normalized temperature changes (~70 K GPa -1 ). From adiabatic temperature change data, we obtained entropy change values larger than 140 J kg -1 K -1 . We found barocaloric effect values that exceed those previously reported for any promising barocaloric materials from direct measurements of temperature change around room temperature. Our results stimulate the study of the barocaloric effect in elastomeric polymers and broaden the pathway to use this effect in solid-state cooling technologies.2

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“…The eC effect of NR was found by Gough and further investigated by Joule (the Gough-Joule effect) [18]. It is the oldest known caloric material, but it is only considered for cooling application recently [19][20][21].For eC effect of NR, elasticity and eC temperature change (ΔT) are two basic quantities. The elasticity of NR is mainly related to the strain-induced crystallization/crystallite (SIC) [22,23].…”

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confidence: 99%

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confidence: 99%

Temperature dependence of the elastocaloric effect in natural rubber

2017

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The temperature dependence of the elastocaloric (eC) effect in natural rubber (NR) is studied adiabatically and isothermally. A broad temperature span for eC effect from 0 o C to 49 o C is observed. The maximum adiabatic temperature change (ΔT) is 12 K at strain of 6 and occurs at 10 o C. These behaviors can be predicted by the temperature dependence of strain-induced crystallization (SIC) and temperature-induced crystallization (TIC). In isothermal condition, the deduced ΔT from Clausius-Clapeyron factor can agree with the direct measurement at different temperatures. The eC performance of NR is compared with shape memory alloys (SMAs). The potential of NR for near room temperature and large-scale cooing application is proved. This will open the SIC research of NR towards eC cooling direction.Current dominant cooling technology is the vapor-compression technology, which is based on the hazardous gas. Solid-state cooling technology based on caloric effect can be an alternative. Caloric effect refers to the adiabatic temperature change or isothermal entropy change stimulated by some fields. According to the stimulus field, caloric effect is divided into magnetocaloric (MC), electrocaloric (EC), barocaloric (BC) and elastocaloric (eC) effect. Although this field is developed from the intention of finding environmentally friendly technology, some caloric effects still show some environmental problems. For MC effect, the needed magnets and the MC material are mainly based on the rare-earth elements (REEs) [1,2], whose production is detrimental to environment [3]. The arsenic (As)-based MC material [4] and the leadbased EC materials [5,6] possess high caloric performance but they are toxic. Some other caloric materials are environmentally friendly and show a high caloric performance but with a high cost, like the widely researched PVDF-based polymers [7,8]. For eC and BC effect, the promising materials are shape memory alloys (SMAs), but they need a large stress (several hundreds of MPa) [9][10][11][12][13][14][15][16], which is not practicable [17]. Thus, alternative caloric materials which are environmentally friendly, cost-effective, of high caloric performance and practicable need to be found.Natural rubber (NR) is one soft eC material. It is environmentally friendly, recyclable and non-toxic. It has the lowest cost among the materials with giant caloric effects [15]. The low stress (several MPa) of NR makes it easier to be manipulated than hard materials (SMAs). The eC effect of NR was found by Gough and further investigated by Joule (the Gough-Joule effect) [18]. It is the oldest known caloric material, but it is only considered for cooling application recently [19][20][21].For eC effect of NR, elasticity and eC temperature change (ΔT) are two basic quantities. The elasticity of NR is mainly related to the strain-induced crystallization/crystallite (SIC) [22,23]. The ΔT is mainly from the latent heat of SIC [24] and a giant eC effect is observed (ΔT ~10 K) [24,25]. Considering the application

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Elastocaloric effect dependence on pre-elongation in natural rubber

Cited by 53 publications

References 39 publications

Large barocaloric effects at low pressures in natural rubber

Large barocaloric effects at low pressures in natural rubber

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Temperature dependence of the elastocaloric effect in natural rubber

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