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Issue 11, 2019
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Enhanced electrocaloric strength of P(VDF-TrFE-CFE) induced by edge-on lamellae

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For the past decade, a novel cooling technique based on electrocaloric (EC) materials has been intensively investigated as an environmentally friendly and highly efficient alternative to the conventional vapor-compression refrigeration. Among all the EC materials, relaxor terpolymer P(VDF-TrFE-CFE) has been demonstrated as a promising candidate owing to its large EC effect and superior thermal stability. However, for the terpolymer, the EC strength (represented by EC temperature change under unit electric field (ΔT/E)) is still far from being satisfactory, which limits the mass application of terpolymer as a viable cooling medium in civil applications. Here, an effective method is employed to induce edge-on lamellae into the terpolymer to enhance the EC strength. Owing to the dipolar moments in the edge-on lamellae, which could be rotated more easily in the out-of-plane direction by the electric field, the treated terpolymer with edge-on lamellae exhibits a much enhanced EC strength of 0.13 K m−1 MV−1. Further exploration also shows a significantly decreased coercive field in the treated terpolymer due to the induced edge-on lamellae, and hence larger dipolar-entropy change could be generated at a modest electric field. The results indicate that a relaxor-like β-phase may also contribute to the enhanced polarizability. More importantly, the terpolymer with edge-on lamellae exhibits high thermal stability within a broad temperature range near room temperature. This work emphasizes the critical role of crystal structure on the macroscopic properties of electrocaloric polymers.

Graphical abstract: Enhanced electrocaloric strength of P(VDF-TrFE-CFE) induced by edge-on lamellae

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Publication details

The article was received on 13 Jan 2019, accepted on 11 Feb 2019 and first published on 11 Feb 2019

Article type: Paper
DOI: 10.1039/C9TC00239A
Citation: J. Mater. Chem. C, 2019,7, 3212-3217

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    Enhanced electrocaloric strength of P(VDF-TrFE-CFE) induced by edge-on lamellae

    J. Qian, M. Guo, J. Jiang, Z. Dan and Y. Shen, J. Mater. Chem. C, 2019, 7, 3212
    DOI: 10.1039/C9TC00239A

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