Exceptionally High Negative Electro-Caloric Effects of Poly(VDF⁻co⁻TrFE) Based Nanocomposites Tuned by the Geometries of Barium Titanate Nanofillers.

ABSTRACT: Exceptionally high electro-caloric effects (ECEs) are observed in nanocomposites consisting of poly(vinylidene fluoride-co-trifluoroethylene) (VDF⁻co⁻TrFE) copolymer and barium titanate (BT) nanoparticles and nanowires. The poly(VDF⁻co⁻TrFE) matrix nanocomposites containing 5% volume fraction of BT nanowires are found to exhibit a negative ECE temperature change as large as 12 °C or a refrigeration effect of 8.3 J/g, which is much larger than those reported to date. The mechanisms of negative ECE and the enhanced negative ECE in the nanocomposites consisting of poly(VDF⁻co⁻TrFE) and BT nanowires are explained by the Kauzmann theory on glassy polar states and the interaction between BT nanofillers and the copolymer matrix. The effects of geometries of BT nanofill

SUBMITTER: Jiang ZY 

PROVIDER: S-EPMC6418831 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature