The effects of anti-ferroelectric nanofillers on the negative electrocaloric effects in Poly(vinylidene fluoride-trifluoroethylene) matrix composites

Sarir Uddin, Guang Ping Zheng, Zhiyuan Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

The electrocaloric effects (ECE) in the composites consisting of ferroelectric (FE) copolymer poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) and (Bi 0.5 Na 0.5 )TiO 3 -xBaTiO 3 nanoparticles (BNT-xBT, x = 0, 0.06, 1.0) are investigated. The anti-ferroelectric (AFE) nanofillers are found to affect more significantly than the FE nanofillers on the order-to-disorder phase transition near 60 °C in the copolymer matrix, as revealed by differential scanning calorimetry. Nevertheless, the influences of AFE nanofillers on the negative ECE are much weaker than that of FE nanofillers, suggesting that the negative ECE observed might not be associated with the AFE states in the composites. Instead, based on the dynamic mechanical analyses on the effects of nanofillers on the order-to-disorder phase transition in the copolymer matrix, the structural glassy states induced by the interaction between the nanofillers and the copolymer matrix are proposed to account for the negative ECE in the composite. This work provides an effective approach in enhancing the negative ECE, which is of technological importance to the implementation of electrocaloric refrigeration.

Original languageEnglish
Pages (from-to)9-13
Number of pages5
JournalSolid State Sciences
Volume90
DOIs
Publication statusPublished - Apr 2019

Keywords

  • Anti-ferroelectric
  • Bismuth sodium titanate
  • Ferroelectric copolymers
  • Negative electrocaloric effect

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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