Enhanced electrocaloric effect in poly(vinylidene fluoride-trifluoroethylene)-based terpolymer/copolymer blends

Chen, Xiang‐Zhong; Qian, Xiao Shi; Li, Xinyu; Lu, Sheng‐Guo; Gu, Hairong; Lin, Minren; Shen, Qun; Zhang, Q. M.

doi:10.1063/1.4722932

Cited by 44 publications

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“…%), although both components form separate crystalline phases, (i) the interfacial couplings to the bulky defects in the terpolymer convert the normal ferroelectric copolymer into a relaxor and that (ii) the addition of the copolymer increases the crystallinity of blends. 21 These findings can explain the facts that (i) 95:5, 90:10, and 85:15 blends entirely exhibit relaxor linear dielectric response and (ii) the increase in dielectric data (compare maximum e 0 values of 100:0 and 95:5 blends in Fig. 1) as a consequence of larger polarization which mostly originates in the crystalline phase.…”

Section: Resultsmentioning

confidence: 63%

Influencing dielectric properties of relaxor polymer system by blending vinylidene fluoride–trifluoroethylene-based terpolymer with a ferroelectric copolymer

Casar

Zhang

et al. 2014

Journal of Applied Physics

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Energy harvesting by nonlinear capacitance variation for a relaxor ferroelectric poly(vinylidene fluoridetrifluoroethylene-chlorofluoroethylene) terpolymer Appl. Phys. Lett. 98, 222901 (2011); 10.1063/1.3595325 Electrocaloric effect of the relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer Appl. Phys. Lett. 94, 042910 (2009); 10.1063/1.3077189 Influence of composition on relaxor ferroelectric and electromechanical properties of poly(vinylidene fluoridetrifluoroethylene-chlorofluoroethylene) J. Appl. Phys. 97, 094105 (2005); 10.1063/1.1882769High electrostriction and relaxor ferroelectric behavior in proton-irradiated poly(vinylidene fluoridetrifluoroethylene) copolymerWe report the influence of blending the poly(vinylidene fluoride-trifluoroethylenechlorofluoroethylene) terpolymer [P(VDF-TrFE-CFE), a member of the relaxor polymer family that exhibits fast response speeds, giant electrostriction, high electric energy density, and large electrocaloric effect] with the ferroelectric poly(vinylidene fluoride-trifluoroethylene) copolymer [P(VDF-TrFE)] on its dielectric response. Although both components form separate crystalline phases, at low copolymer content, the P(VDF-TrFE-CFE)/P(VDF-TrFE) blends entirely exhibit a relaxorlike linear dielectric response, since the interfacial couplings to the bulky defects in the terpolymer convert the normal ferroelectric copolymer into a relaxor. On the other hand, the linear and particularly nonlinear dielectric experiments, i.e., temperature dependences of the second and the third harmonic dielectric response, clearly evidence that in blends with 20-50 wt. % of P(VDF-TrFE), the ferroelectric and relaxor states coexist. The nonlinear dielectric response further reveals the onset of ferroelectric behavior also in blends with low copolymer amount, due to a high VDF content in the terpolymer, which increases the ferroelectric interactions: While in relaxor polymers with lower VDF content, the third order nonlinear dielectric constant, in accordance with the theoretical predictions, exhibits solely positive values, here it changes sign even in the pure P(VDF-TrFE-CFE). V C 2014 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 63%

Influencing dielectric properties of relaxor polymer system by blending vinylidene fluoride–trifluoroethylene-based terpolymer with a ferroelectric copolymer

Casar

Zhang

et al. 2014

Journal of Applied Physics

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“…Similar observations were made for the poly(vinylidene fluoride–trifluoroethylene–chlorofluoroethylene) [P(VDF‐TrFE‐CFE)] copolymer with 10 % poly(vinylidene fluoride–trifluoroethylene) prepared by Chen et al. Although it has a large ECE of approximately 8 K near room temperature, the high electric field requirement (100 MV m −1 ) and low bulk of the film makes it a poor choice for practical systems . However, a redeeming quality of the reported polymer blends was the temperature‐invariant performance over a span of 40 K (293–333 K) …”

Section: Introductionmentioning

confidence: 99%

“…Although it has a large ECE of approximately 8 K near room temperature, the high electric field requirement (100 MV m −1 ) and low bulk of the film makes it a poor choice for practical systems . However, a redeeming quality of the reported polymer blends was the temperature‐invariant performance over a span of 40 K (293–333 K) …”

Section: Introductionmentioning

confidence: 99%

“…Similar observations were made for the poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] copolymer with 10 %p oly(vinylidene fluoride-trifluoroethylene) prepared by Chen et al Although it has al arge ECE of approximately 8K near room temperature, the high electric field requirement( 100 MV m À1 )a nd low bulk of the film makes it ap oor choice for practical systems. [37] However, ar edeeming quality of the reported polymer blendsw as the temperature-invariantp erformanceo ver as pan of 40 K( 293-333 K). [37] Thus,i ti se vident that the mainstream developments in the field of EC refrigeration have only managed to focus on increasing the adiabatic temperature changec apacity of materialsa tr educed electric fields and lowering their peak performance temperatures closer to ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…[37] However, ar edeeming quality of the reported polymer blendsw as the temperature-invariantp erformanceo ver as pan of 40 K( 293-333 K). [37] Thus,i ti se vident that the mainstream developments in the field of EC refrigeration have only managed to focus on increasing the adiabatic temperature changec apacity of materialsa tr educed electric fields and lowering their peak performance temperatures closer to ambient temperatures. [3,4,10] Although this allowst he fabrication of highly energy-efficient materials,i tw ould serve little purpose in fluctuating heat loads.T raditional ferroelectric materials are capable of displaying peak adiabatic temperature changes in the vicinity of the ferro-para transition (Curiet emperature) owing to the large change in polarizationa chieved.…”

Section: Introductionmentioning

confidence: 99%

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Enormous advances have been made to enhance the electrocaloric responses of ferroelectric materials, and new advanced composites transcend the 50 K mark. However, such progress has ignored the need for temperature‐invariant performance, which is essential for continuous cooling. In this regard, we propose the use of Sr‐modified bulk ceramics with the nominal composition Ba0.85Ca0.15−xSrxTi0.9Zr0.1O3 (0

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The recent findings of large electrocaloric effects (ECEs) in ferroelectric polymers and in ferroelectric ceramic thin films have attracted great interest for developing new cooling cycles that are environmental friendly and have the potential to reach better efficiency than the existing vapor‐compression approach. Compared with these solid state ECE materials, a dielectric fluid with a large ECE can be more interesting because it may lead to new cooling cycles with simpler structures than these based on solid state ECE materials. Here it is shown that a large ECE can be realized in the liquid crystal (LC) 5CB near its nematic–isotropic (N‐I) phase transition. 5CB has a large dielectric anisotropy, which facilitates the electric‐field‐induced large polarization change. As a result, a large ECE, i.e., an isothermal entropy change of more than 23.6 J kg−1 K−1 is observed just above the N‐I transition.

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Enhanced electrocaloric effect in poly(vinylidene fluoride-trifluoroethylene)-based terpolymer/copolymer blends

Cited by 44 publications

References 16 publications

Influencing dielectric properties of relaxor polymer system by blending vinylidene fluoride–trifluoroethylene-based terpolymer with a ferroelectric copolymer

Influencing dielectric properties of relaxor polymer system by blending vinylidene fluoride–trifluoroethylene-based terpolymer with a ferroelectric copolymer

Large‐Temperature‐Invariant and Electrocaloric Performance of Modified Barium Titanate for Solid‐State Refrigeration

Large Electrocaloric Effect in a Dielectric Liquid Possessing a Large Dielectric Anisotropy Near the Isotropic–Nematic Transition

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