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Shape-Memory PVDF Exhibiting Switchable Piezoelectricity.

Robin Hoeher1, Thomas Raidt1, Nikola Novak2

  • 1Biomaterials and Polymer Science, Department of Biochemical and Chemical Engineering, TU Dortmund, 44221, Dortmund, Germany.

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|September 3, 2015
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Summary
This summary is machine-generated.

This study developed a novel polymer combining shape-memory and electroactive properties. The material shows excellent shape recovery and transforms to a piezoelectric phase upon programming, enabling dual functionality.

Keywords:
electroactive polymerpiezoelectricitypolyvinylidene fluorideshape-memory polymerswitchable

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Shape-memory polymers (SMPs) offer tunable mechanical properties.
  • Electroactive polymers (EAPs) are crucial for actuators and sensors.
  • Combining these properties in a single material presents unique opportunities.

Purpose of the Study:

  • To design and synthesize a novel polymer integrating shape-memory and electroactive functionalities.
  • To investigate the phase transformation and piezoelectric properties of the developed material.
  • To explore the potential of thermally triggered shape change and electroactivity.

Main Methods:

  • Covalent cross-linking of polyvinylidene fluoride (PVDF) to create a polymer network.
  • Programming the material via rolling to induce phase transformation.
  • Characterization of shape-memory properties (strain, fixity, recovery).
  • Analysis of phase content (α-phase and β-phase) and piezoelectric coefficient (d33).

Main Results:

  • The polymer network demonstrated excellent shape-memory properties with 200% storable strain and 100% fixity/recovery.
  • Rolling-induced programming transformed the material from the α-phase to the piezoelectric β-phase.
  • A maximum β-phase content of 83% was achieved at 200% programming strain, yielding a d33 value of -30 pm V(-1).
  • Thermal triggering resulted in shape change and loss of electroactivity.

Conclusions:

  • The designed PVDF-based polymer successfully combines shape-memory and piezoelectric properties.
  • The material's dual functionality can be controlled through mechanical programming and thermal triggering.
  • This material holds promise for applications requiring adaptive and responsive behavior.