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Large piezoelectricity in crosslinked ferroelectric polymers.

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This study introduces intermolecular crosslinking to significantly boost the piezoelectric coefficient (d33) in ferroelectric polymers. This novel approach enhances performance for flexible electronic devices.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Ferroelectric polymers are promising for flexible electronics due to their electromechanical properties.
  • Improving the piezoelectric coefficient (d33) is crucial for device performance.
  • Current methods often rely on intramolecular engineering, limiting d33 enhancement.

Purpose of the Study:

  • To develop a new strategy for enhancing the piezoelectric coefficient (d33) in ferroelectric polymers.
  • To investigate the effect of intermolecular crosslinking on piezoelectric properties.
  • To provide a facile platform for modulating piezoelectricity in ferroelectric polymers.

Main Methods:

  • An intermolecular crosslinking strategy was employed on ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) copolymers.
  • First-principles calculations were used to understand the mechanism of piezoelectric enhancement.
  • Solution casting process was utilized to implement crosslinking with various agents.

Main Results:

  • Achieved a markedly enhanced piezoelectric coefficient (d33) of -95.0 pC/N.
  • Intermolecular crosslinking created conformational heterogeneity, flattening the energy landscape and improving d33.
  • Crosslinking enhanced piezoelectric properties across different crosslinking agents.

Conclusions:

  • Intermolecular crosslinking is an effective strategy to significantly enhance the piezoelectric coefficient of ferroelectric polymers.
  • This approach offers a facile platform for rational modulation of piezoelectricity.
  • The findings are crucial for large-scale manufacturing of high-performance flexible electromechanical devices.