β-Phase Crystallization of Poly(vinylidene fluoride) in Poly(vinylidene fluoride)/Poly(ethyl methacrylate) Blends

Huang, Zijie; Jiang, Jing; Xue, Gi; Zhou, Dongshan

doi:10.1007/s10118-019-2177-4

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…17–20 Therefore, strategies including regulation of the chemical structure, incorporation of additives, and altering the fabrication conditions or environment have been investigated. 21–30…”

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confidence: 99%

“…[17][18][19][20] Therefore, strategies including regulation of the chemical structure, incorporation of additives, and altering the fabrication conditions or environment have been investigated. [21][22][23][24][25][26][27][28][29][30] Incorporating trifluoroethylene (TrFE) into the PVDF chains, namely PVDF-TrFE copolymer, is effective for the direct generation of the polar b-like ferroelectric phase. 20 It exhibits, however, a low Curie temperature.…”

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Facile fabrication of ferroelectric poly(vinylidene fluoride) thin films with pure γ phase

Dong

Wang

et al. 2022

Chem. Commun.

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Facile fabrication of ferroelectric poly(vinylidene fluoride) thin films with pure γ phase

Dong

Wang

et al. 2022

Chem. Commun.

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“…2,9−14 Great effort has been dedicated to fabricating polar β and γ phases, including incorporation of nucleation agents or other components, 15−37 induction by polar solvent, 38−40 and application of external fields (e.g., stress, high pressure, and electric field). 41−47 Among them, the blending of PVDF with different polymers, such as poly-(methyl methacrylate) (PMMA), 15−18 poly(ethyl methacrylate) (PEMA), 19 poly(lactic acid) (PLA), 20,21 ionic liquid (IL) or poly(ionic liquid) (PIL), 22−25 poly(butylene adipate) (PBA), 26 poly(ethylene adipate) (PEA), 27 hyperbranched polymer (HBP), 28,29 poly(phenylene sulfide) (PPS), 30 nylon-6, 31 and so forth, has been widely studied and is convinced to be capable of creating the polar β and/or γ phases of PVDF. As for the mechanism of the preferred polar phase crystallization of PVDF in the blends, there are mainly two opinions.…”

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confidence: 99%

Influence of Aliphatic Polyesters on the γ Phase Crystallization of Poly(vinylidene fluoride)

Song

Wang

et al. 2022

Macromolecules

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The polar phase of poly(vinylidene fluoride) (PVDF) is attractive for fabricating electroactive devices. However, the nonpolar α form is thermodynamically most accessible during the crystallization process. Here three types of aliphatic polyesters are chosen for blending with PVDF to explore their effect on inducing polar γ phase crystallization of PVDF. It is found that the ability of γ phase nucleation of PVDF enhances as the blend ratio of aliphatic polyesters and isothermal crystallization temperature increase. Poly(butylene succinate) (PBS) with highest melting temperature shows the highest ability for inducing γ phase crystallization. For example, the pure γ phase has been obtained under an appropriate blend ratio and isothermal crystallization temperature in PVDF/PBS blends. This is attributed to the hydrogen bonding interaction of H atoms in PVDF with carbonyls in PBS and the slow diffusion rate of PBS chains in PVDF. The addition of PBS lowers the folding surface free energy of the γ phase. This work offers a reference for selecting a suitable blending system to obtain pure γ phase PVDF and contribute to a better understanding of the relationship between intermolecular interaction and polymorphic phase selection.

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“…The β phase bears the highest electroactive properties [18]. There are several strategies followed to achieve the electroactive β phase, such as applying stretching mechanically with heating, applying high voltage, and doping of piezoelectric materials or metallic nanoparticles [19,20]. Mokhtari et al explored the textile architecture and achieved an energy conversion efficiency of 22.5% for the coiled hybrid piezo fiber energy generator [21].…”

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confidence: 99%

Piezoelectric Nanogenerator Based on Lead-Free Flexible PVDF-Barium Titanate Composite Films for Driving Low Power Electronics

et al. 2021

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Self-powered sensor development is moving towards miniaturization and requires a suitable power source for its operation. The piezoelectric nanogenerator (PENG) is a potential candidate to act as a partial solution to suppress the burgeoning energy demand. The present work is focused on the development of the PENG based on flexible polymer-ceramic composite films. The X-ray spectra suggest that the BTO particles have tetragonal symmetry and the PVDF-BTO composite films (CF) have a mixed phase. The dielectric constant increases with the introduction of the particles in the PVDF polymer and the loss of the CF is much less for all compositions. The BTO particles have a wide structural diversity and are lead-free, which can be further employed to make a CF. An attempt was made to design a robust, scalable, and cost-effective piezoelectric nanogenerator based on the PVDF-BTO CFs. The solvent casting route was a facile approach, with respect to spin coating, electrospinning, or sonication routes. The introduction of the BTO particles into PVDF enhanced the dielectric constant and polarization of the composite film. Furthermore, the single-layered device output could be increased by strategies such as internal polarization amplification, which was confirmed with the help of the polarization-electric field loop of the PVDF-BTO composite film. The piezoelectric nanogenerator with 10 wt% BTO-PVDF CF gives a high electrical output of voltage 7.2 V, current 38 nA, and power density of 0.8 μW/cm2 at 100 MΩ. Finally, the energy harvesting using the fabricated PENG is done by various actives like coin dropping, under air blowing, and finger tapping. Finally, low-power electronics such as calculator is successfully powered by charging a 10 μF capacitor using the PENG device.

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β-Phase Crystallization of Poly(vinylidene fluoride) in Poly(vinylidene fluoride)/Poly(ethyl methacrylate) Blends

Cited by 16 publications

References 32 publications

Facile fabrication of ferroelectric poly(vinylidene fluoride) thin films with pure γ phase

Facile fabrication of ferroelectric poly(vinylidene fluoride) thin films with pure γ phase

Influence of Aliphatic Polyesters on the γ Phase Crystallization of Poly(vinylidene fluoride)

Piezoelectric Nanogenerator Based on Lead-Free Flexible PVDF-Barium Titanate Composite Films for Driving Low Power Electronics

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