Electrostriction-enhanced giant piezoelectricity via relaxor-like secondary crystals in extended-chain ferroelectric polymers

Zhu, Zhiwen; Rui, Guanchun; Li, Qiong; Allahyarov, Elshad; Li, Ruipeng; Soulestin, Thibaut; Santos, Fabrice Domingues Dos; He, Hezhi; Taylor, Philip L.; Zhu, Lei

doi:10.1016/j.matt.2021.09.008

Cited by 23 publications

(45 citation statements)

References 26 publications

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“…The temperature was controlled using a of coP-52/48QSAP (E C = 21 MV/m). According to recent reports, 21,24,32 the in situ slope at E = 0 [(∂S 1 /∂E)| E=0 ] in the returning S 1 −E loops during high-field (e.g., above the E C at 100 MV/m) bipolar poling could be calculated (Figure 1b,d). In the returning loops, a large in situ remanent polarization (P r ) persists at E = 0.…”

Section: ■ Introductionmentioning

confidence: 88%

“…23 Furthermore, if relaxor-like (i.e., highly mobile) secondary crystals (SCs) were induced in the OAF layers (i.e., SC OAF ) of the P(VDF-TrFE) copolymers with an extended-chain crystal (ECC) structure, piezoelectricity was further enhanced via the P r0 -biased electrostriction. 24 For example, the quenched (Q), stretched (S), annealed at 130 °C (A), and electrically poled (P) P(VDF-TrFE) 52/48 mol % copolymer film (coP-52/48QSAP) exhibited a high d 31 of 57.6 ± 2.4 pm/V at room temperature. Note, SCs had been reported before for PVDF polymers 25,26 and were ascribed to the short −(CH 2 CF 2 ) n − sequences separated by head-to-head and tailto-tail (HHTT) defects (usually 5−6 mol %) in PVDF chains.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The comonomer composition was determined by proton nuclear magnetic resonance ( 1 H NMR) spectroscopy. 24 The molecular weight and molecular weight distribution were determined by size-exclusion chromatography: the number-average molecular weight was 287 000 g/mol and the dispersity was 2.9. 24 The polymer powder was used as received without further purification.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Note that in situ slope at E = 0 could be used to show the upper limit of the piezoelectric performance, as discussed before. 24 In practical applications, ex situ d 31 should be used. The ex situ inverse d 31 was determined by the slope of the linear S 1 −E loop at a low electric field (e.g., below the E C at 10 MV/m; Figure 1e,f).…”

Section: ■ Introductionmentioning

confidence: 99%

“…It was ascribed to the scattering from SCs in the IAF layer (SC IAF , see Scheme 1). 24 To obtain the overall PC lamellar spacing (L PC ), one-dimensional (1D) correlation function analysis was performed based on the integrated 1D SAXS curves in Figure 2c,g for coP-52/48QSAP and coP-52/48QSAPSP. The correlation function results are presented in the insets.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Dipole Mobility in Secondary Crystals on Piezoelectricity of a Poly(vinylidene fluoride-co-trifluoroethylene) 52/48 mol % Random Copolymer with an Extended-Chain Crystal Structure

Zhu

Rui

et al. 2021

Macromolecules

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High-performance piezoelectric polymers are promising for a broad range of practical applications, such as sensors, actuators, and energy generators in medical devices, wearable electronics, and soft robotics. Recently, high piezoelectric performance was reported for poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] copolymers with the composition around 50/50 mol %, which was attributed to the relaxor-like secondary crystals (SCs) in the oriented amorphous fraction (SC OAF ). However, it was still unclear how the dipole mobility in the SC OAF affected the piezoelectricity of ferroelectric polymers. In this work, we compared two P(VDF-TrFE) 52/48 mol % samples with an extended-chain crystal structure. The first sample was hot pressed, quenched, stretched, annealed at 130 °C, and unidirectionally poled at 100 MV/m (denoted as coP-52/48QSAP). After additional uniaxial stretching of coP-52/48QSAP at 6%, followed by electric poling, the coP-52/48QSAPSP film was obtained. Intriguingly, coP-52/ 48QSAPSP exhibited much lower piezoelectric performance than coP-52/48QSAP at room temperature. Based on a broadband dielectric spectroscopy study, it was found that the dipole mobility in coP-52/48QSAPSP was significantly decreased as compared to that in coP-52/48QSAP. It was the lower dipole mobility that decreased the piezoelectric performance for coP-52/48QSAPSP. However, upon heating toward the melting temperature (∼58 °C) of the SC OAF , the dipole mobility was regained, and high piezoelectric performance was achieved at 50 °C: the piezoelectric strain constant d 31 = 62.5 ± 7.2 pm/V and the electromechanical coupling factor k 31 = 0.123. This understanding of the dipole mobility in SC OAF provides a guide to achieving high piezoelectric performance in other ferroelectric polymers such as PVDF homopolymers.

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Section: ■ Introductionmentioning

confidence: 88%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Dipole Mobility in Secondary Crystals on Piezoelectricity of a Poly(vinylidene fluoride-co-trifluoroethylene) 52/48 mol % Random Copolymer with an Extended-Chain Crystal Structure

Zhu

Rui

et al. 2021

Macromolecules

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Piezoelectric Polymers

Liu

Wang

2023

Encyclopedia of Polymer Science and Technology

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Piezoelectric polymers are promising alternatives to perovskite ferroelectrics to develop soft and flexible sensors, actuators, robotics, and energy harvesters due to low cost, flexibility, biocompatibility, smaller acoustical impedance and so on. This article provides an update on the major advancements in the development of poly(vinylidene fluoride)‐based ferroelectric polymers for piezoelectric applications and summarizes the physical models used to understand the negative longitudinal piezoelectric coefficients. We address the fundamentals in understanding of the piezoelectric effect in other piezoelectric polymers and also discuss the piezoelectric polymer‐based devices.

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Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)‐Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications

Zhang

Zhu

et al. 2023

Adv Funct Materials

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Poly(vinylidene fluoride) (PVDF)‐based polymers demonstrate great potential for applications in flexible and wearable electronics but show low piezoelectric coefficients (e.g., −d33 < 30 pC N−1). The effective improvement for the piezoelectricity of PVDF is achieved by manipulating its semicrystalline structures. However, there is still a debate about which component is the primary contributor to piezoelectricity. Therefore, current methods to improve the piezoelectricity of PVDF can be classified into modulations of the amorphous phase, the crystalline region, and the crystalline–amorphous interface. Here, the basic principles and measurements of piezoelectric coefficients for soft polymers are first discussed. Then, three different categories of structural modulations are reviewed. In each category, the physical understanding and strategies to improve the piezoelectric performance of PVDF are discussed. In particular, the crucial role of the oriented amorphous fraction at the crystalline–amorphous interface in determining the piezoelectricity of PVDF is emphasized. At last, the future development of high performance piezoelectric polymers is outlooked.

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Electrostriction-enhanced giant piezoelectricity via relaxor-like secondary crystals in extended-chain ferroelectric polymers

Cited by 23 publications

References 26 publications

Effect of Dipole Mobility in Secondary Crystals on Piezoelectricity of a Poly(vinylidene fluoride-co-trifluoroethylene) 52/48 mol % Random Copolymer with an Extended-Chain Crystal Structure

Effect of Dipole Mobility in Secondary Crystals on Piezoelectricity of a Poly(vinylidene fluoride-co-trifluoroethylene) 52/48 mol % Random Copolymer with an Extended-Chain Crystal Structure

Piezoelectric Polymers

Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)‐Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications

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