Thin poly(ionic liquid) and poly(vinylidene fluoride) blend films with ferro- and piezo-electric polar γ-crystals

Vimal K. Tiwari, Yujeong Lee, Giyoung Song, Kang Lib Kim, Youn Jung Park, Cheolmin Park

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Abstract

Ferro- and piezo-electric poly(vinylidene fluoride) (PVDF) thin film is reported to be obtained by using a poly(ionic liquid) (PIL) [poly(2-(dimethylamino)ethyl methacrylate) methyl chloride quaternary salt] through solution route. The short range interactions between localized cationic ions of PIL and polar >CF2 of PVDF are responsible for modified polar γ-PVDF (T3GT3Ḡ) formation. Modification in chain conformation of PVDF is confirmed by FTIR, XRD, and DSC studies suggesting the miscible PVDF–PIL (PPIL) blend. Up to 40 wt % loading of PIL in PVDF matrix enhances relative intensity of γ-phase up to 50% in the entire crystalline phase. The P-E hysteresis loop of PVDF-PIL blends at 25 wt % PIL loading (PPIL-25) thin film at sweep voltage of ±50 V shows excellent ferroelectric property with nearly saturated high remnant polarization ∼6.0 µC cm−2 owing to large proportion of γ-PVDF. However, non-polar pure PVDF thin film shows unsaturated hysteresis loop with 1.4 µC cm−2 remnant polarization. The operation voltage decreases effectively because of the polar γ-phase formation in PPIL blended film. High-sensitivity piezo-response force microscopy shows electromechanical switching property at low voltages in PPIL-25 thin films through local switching measurements, making them potentially suitable as ferroelectric tunnel barriers.

Original languageEnglish
Pages (from-to)795-802
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume56
Issue number10
DOIs
Publication statusPublished - 2018 May 15

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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