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Compressible Polymer Composites with Enhanced Dielectric Temperature Stability.

Tongxiang Tang1, Wenfeng Yang1,2, Zhonghui Shen3

  • 1State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

High-dielectric-constant polymer composites achieve high performance with a novel BaTiO3 ceramic scaffold. This innovation enables robust dielectric properties for flexible electronics even under extreme temperatures and mechanical stress.

Keywords:
ceramic scaffoldsdielectric temperature stabilityferroelectric materialsflexible dielectricspolymer composites

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Area of Science:

  • Materials Science
  • Polymer Science
  • Ceramic Engineering

Background:

  • High-dielectric-constant polymer composites are crucial for flexible electronics and energy storage.
  • Current methods require high filler content, leading to poor mechanical properties and high dielectric loss.
  • Overcoming interfacial polarization issues is key to enhancing dielectric performance.

Purpose of the Study:

  • To develop a polymer composite with a high dielectric constant (εr) at low filler loading.
  • To improve the thermal and mechanical stability of dielectric properties in polymer composites.
  • To enable advanced applications in flexible electronics and energy storage capacitors.

Main Methods:

  • Fabrication of a polymer composite featuring an interconnected BaTiO3 (BT) ceramic scaffold.
  • Incorporation of relaxor Ba(ZrxTi1-x)O3 phase within the BT scaffold.
  • Evaluation of dielectric properties under varying temperatures and compressive strains.

Main Results:

  • Achieved a high εr of ≈210 at a low BT volume fraction of ≈18 vol%.
  • Demonstrated excellent dielectric temperature stability (Δεr < ±10% from 25-140 °C).
  • Maintained stable dielectric performance under compressive strain up to 80%.

Conclusions:

  • The proposed BT ceramic scaffold approach offers a facile method for creating high-performance polymer composites.
  • The developed composites exhibit robust dielectric properties, suitable for demanding applications.
  • This work paves the way for advanced flexible electronics and high-temperature energy storage solutions.