Dependence on supermolecular structure and on charge injection conditions of ferroelectric switching of pvdf and its blends with PMMA

Becker, A.; Stein, M.; Jungnickel, B.‐J.

doi:10.1080/00150199508018426

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…The origin of such high-quality ferroelectric behaviors obtained at elevated poling temperature still remain complex to identify, but PMMA and PMMA-MAA are suspected to activate particular ionic conduction mechanisms inside the amorphous phase that enhance and stabilize charge compensation effects or modify the effective internal electric field. Such modifications of the ionic conductivity have been already detected in PVDF/PMMA blends with an increase of the electrical conductivity from approximately (0.8 to 200) × 10 –15 S/cm between 23 and 90 °C respectively (compared to (5–700) × 10 –15 S/cm in the case of neat PVDF) . Such conclusions are also in agreement with the ionic nature of PMMA-MAA that naturally brings new conduction mechanisms, in particular at elevated temperature.…”

Section: Results and Discussionsupporting

confidence: 82%

“…Such modifications of the ionic conductivity have been already detected in PVDF/PMMA blends with an increase of the electrical conductivity from approximately (0.8 to 200) × 10 −15 S/cm between 23 and 90 °C respectively (compared to (5−700) × 10 −15 S/cm in the case of neat PVDF). 65 Such conclusions are also in agreement with the ionic nature of PMMA-MAA that naturally brings new conduction mechanisms, in particular at elevated temperature.…”

Section: Resultssupporting

confidence: 68%

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Beta Phase Crystallization and Ferro- and Piezoelectric Performances of Melt-Processed Poly(vinylidene difluoride) Blends with Poly(methyl methacrylate) Copolymers Containing Ionizable Moieties

Neef

Samuel

Amorín

et al. 2020

ACS Appl. Polym. Mater.

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Poly(methyl methacrylate-co-methacrylic acid) (PMMA-co-MAA) copolymer containing ionizable moieties is here investigated as a melt processing additive for poly(vinylidene difluoride) (PVDF) to develop high-quality ferro- and piezoelectric polymer films by extrusion-calendering. The PVDF/PMMA-co-MAA miscibility and the β-phase crystallization from the melt state at high cooling rates were first explored by flash differential scanning calorimetry (FDSC). Transposition to the melt-processing of thin films by extrusion-calendering was attempted, and direct production of β-crystals in high amounts was confirmed at a specific content of 5 wt % PMMA-co-MAA. Ferro- and piezoelectric properties were subsequently investigated, and classical ferroelectric-type hysteresis loops clearly appeared at room temperature for AC electric fields higher than 900–1200 kV/cm. Enhanced remanent polarizations (P r) were observed with only 5 wt % PMMA-based additives, and the best ferroelectric performances were identified for PVDF/PMMA-co-MAA blends, in agreement with a higher β-phase content. Stable piezoelectric properties are also highlighted with maximal piezoelectric coefficient (d 33) of 11 pC/N for these formulations. A linear relationship is found between d 33 and P r in accordance with several models, and in this respect, the origin and optimization of the remanent polarization was investigated. Crystal transformations were revealed during high-voltage AC poling, and high-quality ferroelectric behaviors with high P r values up to 7 μC/cm2 were obtained at elevated poling temperatures for PVDF/PMMA-co-MAA blends (theoretical d 33 up to 16 pC/N) approaching the theoretical limit value for perfectly poled β-crystals. This study clearly opens up interesting perspectives in the development of cost-effective electroactive polymer films using industrially relevant processes and demonstrates that PVDF-based blends with miscible functional PMMA copolymers represent an interesting approach for this purpose.

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Section: Results and Discussionsupporting

confidence: 82%

Section: Resultssupporting

confidence: 68%

Beta Phase Crystallization and Ferro- and Piezoelectric Performances of Melt-Processed Poly(vinylidene difluoride) Blends with Poly(methyl methacrylate) Copolymers Containing Ionizable Moieties

Neef

Samuel

Amorín

et al. 2020

ACS Appl. Polym. Mater.

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A blended binary composite of poly(vinylidene fluoride) and poly(methyl methacrylate) exhibiting excellent energy storage performances

et al. 2019

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Patterned ferro-, pyro- and piezoelectricity in poly(vinylidene fluoride) by means of a laser-induced irreversible β→α phase transformation

Wegener

Hesse

Wegener

et al. 2002

Journal of Applied Physics

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Materials with patterned pyro- or piezoelectricity are useful for a range of applications such as sensor arrays with reduced cross talk between individual elements, piezoelectric gratings for direction-sensitive acoustic-wave detection/emission, or motion-sensitive pyroelectric sensors. Here, the successful patterning of pyro- and piezoelectric poly(vinylidene fluoride) (PVDF) films, by controlled scanning of a focused laser beam across their top electrodes, is reported. The resulting patterns are based on the differences between the ferroelectric polar β phase and the paraelectric nonpolar α phase of PVDF. Nonpolar α-phase areas are generated in a poled β-PVDF film through a local heating process that yields a β→α phase transition throughout the thickness of the film. An important feature of this process is the fact that the PVDF film remains intact and can still be used even in applications that require free-standing films. Infrared spectroscopy and pyroelectrical depth profiling are employed to prove the β→α phase transition and the accompanying pyroelectricity pattern, respectively.

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Dependence on supermolecular structure and on charge injection conditions of ferroelectric switching of pvdf and its blends with PMMA

Cited by 8 publications

References 15 publications

Beta Phase Crystallization and Ferro- and Piezoelectric Performances of Melt-Processed Poly(vinylidene difluoride) Blends with Poly(methyl methacrylate) Copolymers Containing Ionizable Moieties

Beta Phase Crystallization and Ferro- and Piezoelectric Performances of Melt-Processed Poly(vinylidene difluoride) Blends with Poly(methyl methacrylate) Copolymers Containing Ionizable Moieties

A blended binary composite of poly(vinylidene fluoride) and poly(methyl methacrylate) exhibiting excellent energy storage performances

Patterned ferro-, pyro- and piezoelectricity in poly(vinylidene fluoride) by means of a laser-induced irreversible β→α phase transformation

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