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<p>PVDF-based polymers exhibit remarkable dielectric, piezoelectric, ferroelectric, and electrostrictive properties, rendering them highly suitable for diverse applications including sensors, actuators, and energy harvesting devices. To optimize the physical characteristics of these polymeric materials, controlled annealing process within the temperature range between the melting temperature and crystallization temperature is commonly utilized to enhance crystallinity. This study discovered the effects of short-term heat treatment within 40–110&#xa0;°C (lower than the crystallization temperature) on the physical properties of P(VDF-TrFE) copolymers and P(VDF-TrFE-CFE) terpolymers. We demonstrate that short-term heat treatment transiently enhances the dielectric, ferroelectric, and piezoelectric properties of P(VDF-TrFE) copolymers, while P(VDF-TrFE-CFE) terpolymer shows no such improvement. We propose that β phase is a key factor driving this enhancement, with the βc relaxation, which is associated with molecular motion in crystalline regions or crystalline-amorphous interfaces, playing a pivotal role. This study provides new insights into the relationship between microstructure and macroscopic properties, as well as the origin of high dielectric properties in PVDF-based polymers.</p>

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Transient increase of dielectric, ferroelectric, and piezoelectric properties in P(VDF-TrFE) copolymers after short-term heat treatment

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Yuhong Zhu,
  • Rui Peng,
  • Jiayi Jin,
  • Baojin Chu

摘要

PVDF-based polymers exhibit remarkable dielectric, piezoelectric, ferroelectric, and electrostrictive properties, rendering them highly suitable for diverse applications including sensors, actuators, and energy harvesting devices. To optimize the physical characteristics of these polymeric materials, controlled annealing process within the temperature range between the melting temperature and crystallization temperature is commonly utilized to enhance crystallinity. This study discovered the effects of short-term heat treatment within 40–110 °C (lower than the crystallization temperature) on the physical properties of P(VDF-TrFE) copolymers and P(VDF-TrFE-CFE) terpolymers. We demonstrate that short-term heat treatment transiently enhances the dielectric, ferroelectric, and piezoelectric properties of P(VDF-TrFE) copolymers, while P(VDF-TrFE-CFE) terpolymer shows no such improvement. We propose that β phase is a key factor driving this enhancement, with the βc relaxation, which is associated with molecular motion in crystalline regions or crystalline-amorphous interfaces, playing a pivotal role. This study provides new insights into the relationship between microstructure and macroscopic properties, as well as the origin of high dielectric properties in PVDF-based polymers.