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Electrocaloric Enhancement Induced by Cocrystallization of Vinylidene Difluoride-Based Polymer Blends

Active thermal control will be a major challenge of the twenty-first century, which has emphasized the need for the development of energy-efficient refrigeration techniques such as electrocaloric (EC) cooling. Highly polar semicrystalline VDF-based polymers are promising organic EC materials, howeve...

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Bibliographic Details
Published in:ACS macro letters 2021-12, Vol.10 (12), p.1555-1562
Main Authors: Le Goupil, Florian, Coin, Francesco, Pouriamanesh, Naser, Fleury, Guillaume, Hadziioannou, Georges
Format: Article
Language:English
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Summary:Active thermal control will be a major challenge of the twenty-first century, which has emphasized the need for the development of energy-efficient refrigeration techniques such as electrocaloric (EC) cooling. Highly polar semicrystalline VDF-based polymers are promising organic EC materials, however, their cooling performance, which is highly structurally dependent, needs further improvement to become competitive. Here, we report a simple method to increase the crystalline coherence of P­(VDF-ter-TrFE-ter-CFE) terpolymer in the plane including the polar direction. This is achieved by blending P­(VDF-ter-TrFE-ter-CFE) with minute amounts of P­(VDF-co-TrFE) copolymer with similar VDF/TrFE unit content. This similarity allows for a cocrystallization of the copolymer chains in the terpolymer crystalline lamellae, preferentially extending the lateral coherence without lamellar thickening, as validated with a wide range of structural characterization. This trend results in a significant dielectric and electrocaloric enhancement, with a remarkable electrocaloric effect, ΔT EC = 5.2 K, confirmed by direct measurements for a moderate electric field of 90 MV·m–1 in a blend with 1 wt % of copolymer.
ISSN:2161-1653
2161-1653
DOI:10.1021/acsmacrolett.1c00576