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Enhanced Electrocaloric Response of Vinylidene Fluoride–Based Polymers via One‐Step Molecular Engineering.

Enhanced Electrocaloric Response of Vinylidene Fluoride–Based Polymers via One‐Step Molecular Engineering.

Authors :
Le Goupil, Florian
Kallitsis, Konstantinos
Tencé‐Girault, Sylvie
Pouriamanesh, Naser
Brochon, Cyril
Cloutet, Eric
Soulestin, Thibaut
Domingue Dos Santos, Fabrice
Stingelin, Natalie
Hadziioannou, Georges
Source :
Advanced Functional Materials. 1/4/2021, Vol. 31 Issue 1, p1-8. 8p.
Publication Year :
2021

Abstract

Electrocaloric refrigeration is one of the most promising environmentally‐friendly technologies to replace current cooling platforms—if a notable electrocaloric effect (ECE) is realized around room temperature where the highest need is. Here, a straight‐forward, one‐pot chemical modification of P(VDF‐ter‐TrFE‐ter‐CTFE) is reported through the controlled introduction of small fractions of double bonds within the backbone that, very uniquely, decreases the lamellar crystalline thickness while, simultaneously, enlarging the crystalline coherence along the a‐b plane. This increases the polarizability and polarization without affecting the degree of crystallinity or amending the crystal unit cell—undesirable effects observed with other approaches. Specifically, the permittivity increases by >35%, from 52 to 71 at 1 kHz, and ECE improves by >60% at moderate electric fields. At 40 °C, an adiabatic temperature change >2 K is realized at 60 MV m−1 (>5.5 K at 192 MV m−1), compared to ≈1.3 K for pristine P(VDF‐ter‐TrFE‐ter‐CTFE), highlighting the promise of a simple, versatile approach that allows direct film deposition without requiring any post‐treatment such as mechanical stretching or high‐temperature annealing for achieving the desired performance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
1616301X
Volume :
31
Issue :
1
Database :
Academic Search Index
Journal :
Advanced Functional Materials
Publication Type :
Academic Journal
Accession number :
147905983
Full Text :
https://doi.org/10.1002/adfm.202007043