Modeling large permittivity of poly(vinylidenefluoride-co-trifluoroethylene) and nanospring single-walled carbon nanotube-polyvinylpyrrolidone nanocomposites

Yun Jae Lee, Jung Hyuk Kim, Sora Ham, Byeong Kwon Ju, Won Kook Choi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Highly dispersible nanospring single-walled carbon nanotubes (NS-CNTs) were incorporated in a P(VDF-TrFE) copolymer with up to 15 wt.% of nanofiller. The relative dielectric constant (K) of the polymer nanocomposite at 1 kHz was greatly enhanced from 12.7 to 62.5 at 11 wt.% of NS-CNTs, corresponding to a 492% increase over that of pristine P(VDF-TrFE) with only a small dielectric loss tangent (D) of 0.1. Based on two theoretical models, the Bruggeman equation and self-consistent effective medium theory (SC-EMT), experimental permittivity data for the P(VDF-TrFE) and NS-CNTs nanocomposites were simulated to estimate the dielectric constant of the NS-CNTs while changing both the shape of the nanofillers and the volume fraction of the interface when increasing the number of NS-CNTs in piled layers of P(VDF-TrFE). The number of NS-CNTs layers was counted from HR-TEM images to calculate the interfacial volume fraction, and used to infer the Eshelby tensor of the NS-CNTs in the SC-EMT model. The experimental dielectric constants of the composite films fit the Bruggeman equation and SC-EMT theory well for dielectric constants k=240-360, showing that the NS-CNTs nanofillers may be considered electrically semiconductive.

Original languageEnglish
Article number085113
JournalAIP Advances
Volume8
Issue number8
DOIs
Publication statusPublished - 2018 Aug 1

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nanocomposites
carbon nanotubes
permittivity
tangents
dielectric loss
copolymers
tensors
transmission electron microscopy
composite materials
polymers
estimates

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Modeling large permittivity of poly(vinylidenefluoride-co-trifluoroethylene) and nanospring single-walled carbon nanotube-polyvinylpyrrolidone nanocomposites. / Lee, Yun Jae; Kim, Jung Hyuk; Ham, Sora; Ju, Byeong Kwon; Choi, Won Kook.

In: AIP Advances, Vol. 8, No. 8, 085113, 01.08.2018.

Research output: Contribution to journalArticle

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