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Limiting Relative Permittivity "Burn-in" in Polymer Ferroelectrics via Phase Stabilization
Naser Pouriamanesh1, Florian Le Goupil1, Natalie Stingelin2
1Université de Bordeaux, CNRS Bordeaux INP/ENSCBP, Laboratoire de Chimie des Polyméres Organiques, UMR 5629, Allée Geoffroy Saint-Hilaire, 33615, Pessac Cedex, France.
ACS Macro Letters
|May 16, 2022
Summary
Improving the phase stability of poly(vinylidene fluoride) (PVDF) ferroelectric polymers is key for long-term dielectric performance. This study limits chain motion in P(VDF-ter-TrFE-ter-CFE) to enhance stability and reduce permittivity changes.
Area of Science:
- Materials Science
- Polymer Science
- Dielectric Materials
Background:
- Poly(vinylidene fluoride) (PVDF) and its copolymers are crucial ferroelectric materials for applications like energy storage and refrigeration.
- Their utility is often limited by poor phase stability and long-term degradation of dielectric properties due to complex thermal behavior.
- Understanding and controlling phase stability is essential for reliable performance of these polymers.
Purpose of the Study:
- To investigate methods for enhancing the phase stability of ferroelectric terpolymers, specifically P(VDF-ter-TrFE-ter-CFE).
- To demonstrate how limiting mass transport and segmental chain motion improves long-term dielectric properties.
- To establish processing guidelines for VDF-based polymers using accessible characterization data.
Main Methods:
- Utilized a terpolymer P(VDF-ter-TrFE-ter-CFE) with a molar ratio of 64/29/7.
- Limited mass transport by employing highly entangled polymer systems through careful selection of solution concentration and molecular weight.
- Employed rapid solvent extraction to minimize unwanted relaxation processes.
Main Results:
- Observed significantly reduced "burn-in" effect in relative permittivity (εr), with values decreasing minimally over time and saturating at 96-97% of the initial value.
- Achieved enhanced control over the phase stability of the P(VDF-ter-TrFE-ter-CFE) terpolymer.
- Demonstrated that thermal analysis and rheometry data are sufficient for predicting processing routes and material properties.
Conclusions:
- Limiting mass transport and segmental chain motion during and after solidification is an effective strategy to improve the phase stability of VDF-based ferroelectric polymers.
- The findings provide a pathway for reliable material design and processing of these polymers, reducing reliance on complex characterization techniques.
- This research offers critical insights for optimizing the long-term dielectric performance of ferroelectric polymers for advanced applications.
