Giant spontaneous polarization for enhanced ferroelectric properties of biaxially oriented poly(vinylidene fluoride) by mobile oriented amorphous fractions

Rui, Guanchun; Huang, Yanfei; Chen, Xinyue; Li, Ruipeng; Wang, Dingrui; Miyoshi, Toshikazu; Zhu, Lei

doi:10.1039/d0tc04632a

Cited by 44 publications

(70 citation statements)

References 94 publications

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“…The amorphous structures, which include both oriented and isotropic amorphous fractions (OAF and IAF), should also play an important role, as we reported recently. 19 Therefore, we should consider the complex semicrystalline structures as a whole for the electrostriction of FE polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For PVDF-based polymers, there is a significant content of the OAF, as we recently reported. 19 Different from many other polymers, whose OAFs often become the rigid amorphous fractions because of the crystal constraint, 21,22 the OAFs in PVDF-based polymers are quite mobile around room temperature. We speculated that the highly dipolar structure of the PVDF OAFs renders the high mobility and thus enhanced FE property for PVDF-based polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

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Origins of Electrostriction in Poly(vinylidene fluoride)-Based Ferroelectric Polymers

et al. 2020

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Although electrostriction is ubiquitous for dielectric polymers, giant electrostriction has not been observed until relaxor ferroelectric (RFE) poly(vinylidene fluoride) (PVDF)-based polymers are achieved. However, the exact origin for giant electrostriction in these polymers has not been fully understood. By studying the electrostriction in the uniaxially stretched films of a ferroelectric poly(VDF-co-trifluoroethylene) [P(VDF-TrFE)] random copolymer and an RFE poly(VDF-co-TrFE-co-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] random terpolymer in this work, we confirmed that ferroelectric switching with large hysteresis, such as in the case of P(VDF-TrFE), was not genuine electrostriction. By decreasing large ferroelectric domains to the nanometer scale (i.e., 2–3 nm), such as in the case of the P(VDF-TrFE-CTFE) terpolymer, electrostriction with low hysteresis could be achieved. Two origins of the large electrostriction in these polymers were identified. The first was the mechano-electrostriction due to the poling field-induced conformation transformation of oriented polymer chains. The second was the electric repulsion of electrically aligned nanodomains. These effects could occur in both crystals and the oriented amorphous fraction, which links between the nanocrystals and the isotropic amorphous fraction. When the poling field was relatively low (e.g., <40 MV/m), the mechano-electrostriction was the major contribution and the electric repulsion effect was a minor contribution to electrostriction. Meanwhile, a strong temperature dependence of the low-field electrostriction coefficient was observed. Finally, we found an empirical inverse relationship between the electrostriction coefficient and the product of Young’s modulus and dielectric constant. The knowledge obtained from this study provides an insightful understanding of the electrostriction mechanism in PVDF-based electroactive polymers, which will find potential applications in sensors and actuators for wearable electronics and soft robotics.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Origins of Electrostriction in Poly(vinylidene fluoride)-Based Ferroelectric Polymers

et al. 2020

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“…[37,38] For semicrystalline polymers, the overall quality of the film is improved by the stretching process. [21,39] Therefore, the PDLA film maintains excellent stability of the breakdown field, which is a huge improvement for polymer film in energy storage applications.…”

Section: Resultsmentioning

confidence: 99%

Poly(lactic acid)‐Based Film with Excellent Thermal Stability for High Energy Density Capacitor Applications

Wang

Zhang

et al. 2021

Macro Materials & Eng

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Dielectric capacitors play a key role in high power electronics, electric vehicles, and medical devices. Due to the biodegradability, high thermal stability, and ease of processing, poly(lactic acid)-based (PLA) films are widely used in applications of tissue engineering, actuators, and sensors. In this investigation, PLA films are prepared using a solution casting method for high energy density capacitor applications. It is found that the stretched poly(d-lactic acid) (PDLA) film exhibits an energy density and charge discharge efficiency of 18.5 J cm −3 and 95%, respectively, at room temperature. Furthermore, after a heating time of 30 min at 100 °C, it is found that the energy density and chargedischarge efficiency of the stretched PDLA films are maintained at 11.2 J cm −3 and 76%, respectively. In comparison, the energy density and efficiency of the stretched PDLA film are 1.03-fold and 53% higher, respectively, than those of the stretched poly(vinylidene fluoride-hexafluoropropylene) film at 100 °C with the same heat treatment. Compared with a high temperature polyimide material, the energy density of the stretched PDLA film is 1.98-fold higher at 100 °C. The PLA-based material shows great promise for application in high energy density capacitors operating at a high temperature (100 °C).

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“…Recently, in situ dynamic X-ray diffraction measurements on a spin-coated P(VDF-TrFE) 65/35 mol % sample suggested that an additional contribution from the electromechanical coupling between the crystalline lamellae and the amorphous regions should be the primary contribution to polymer piezoelectricity . From our recent work on highly poled biaxially oriented PVDF with a pure β phase, this interfacial coupling was actually realized via the highly mobile, liquid crystal-like oriented amorphous fraction (OAF) between the crystalline lamella and the isotropic amorphous fraction (IAF) . 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 .…”

Section: Introductionmentioning

confidence: 99%

“…21 From our recent work on highly poled biaxially oriented PVDF with a pure β phase, 22 this interfacial coupling was actually realized via the highly mobile, liquid crystal-like oriented amorphous fraction (OAF) between the crystalline lamella and the isotropic amorphous fraction (IAF). 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.…”

Section: ■ Introductionmentioning

confidence: 99%

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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Giant spontaneous polarization for enhanced ferroelectric properties of biaxially oriented poly(vinylidene fluoride) by mobile oriented amorphous fractions

Abstract: Oriented amorphous fraction in biaxially oriented poly(vinylidene fluoride) gives it significantly enhanced dielectric and ferroelectric properties.

Cited by 44 publications

References 94 publications

Origins of Electrostriction in Poly(vinylidene fluoride)-Based Ferroelectric Polymers

Origins of Electrostriction in Poly(vinylidene fluoride)-Based Ferroelectric Polymers

Poly(lactic acid)‐Based Film with Excellent Thermal Stability for High Energy Density Capacitor Applications

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

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