Highly oriented PVDF molecular chains for enhanced material performance

Chen, Xing; Tougne, Claire; Jiang, Tao; Espíndola‐Rodríguez, Moisés; Zhao, Qi; Jia, Qingxuan; Mendil‐Jakani, Hakima; Jiang, Jianjun; Zhang, Wenjing

doi:10.1016/j.polymer.2022.125366

Cited by 8 publications

(2 citation statements)

References 52 publications

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“…An effective method to form β-phase crystals is electrospinning [7,8], which is based on an electrohydrodynamic process for the formation of continuous thin fibers [9,10]. Electrospinning has been used to obtain piezoelectric polymer nanofibers (NFs) with polymer chains or helices oriented parallel to the fiber axis (e.g., PVDF [8,11], poly(γ-benzyl α, L -gultamate) [12], and polyamide 11 [13,14]). A high molecular orientation along the fiber axis is induced by extremely high draw ratios and strain rates during the spinning process (note that the β-phase crystals in PVDF NFs can also be formed by means of blow spinning without an electric field [15]).…”

Section: Introductionmentioning

confidence: 99%

Structure–Piezoelectric Property Relationships of Thin Films Composed of Electrospun Aligned Poly(vinylidene fluoride) Nanofibers

Priangga Perdana Putra,

Akasaka,

Konosu

et al. 2024

Nanomaterials

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In the past two decades, many studies on piezoelectric nanofibers (NFs) prepared from poly(vinylidene fluoride) (PVDF) and its copolymers, including single NFs, randomly oriented nonwoven mats, and aligned NFs, have been reported. However, studies on the relationships between the PVDF NF diameter, the orientation of the β-phase crystals inside NFs, and the piezoelectric properties of the NFs are still limited. In this study, the effect of the fiber diameter on the internal molecular packing/orientation and piezoelectric properties of aligned PVDF NF thin films was investigated. Herein, piezoelectric thin films composed of densely packed, uniaxially aligned, PVDF NFs with diameters ranging from 228 to 1315 nm were prepared by means of electrospinning with a rotating collector and successive hot-pressing and poling. The effect of the diameters of PVDF NFs on their internal structures, as well as the piezoelectric properties of the thin films, was investigated. All prepared NFs mainly contained β-phase crystals with a similar total crystallinity. The orientation of the β-phase crystals inside the NFs increased with an increase in the fiber diameter, resulting in an improved transverse piezoelectric coefficient (d31) for the thin films. The output voltage of the prepared thin films reached a maximum of 2.7 V at 104 Hz.

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Section: Introductionmentioning

confidence: 99%

Structure–Piezoelectric Property Relationships of Thin Films Composed of Electrospun Aligned Poly(vinylidene fluoride) Nanofibers

Priangga Perdana Putra,

Akasaka,

Konosu

et al. 2024

Nanomaterials

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“…[28][29][30][31][32][33][34] To obtain the desired piezoelectric properties, PVDF containing less fraction of β-PVDF must be converted into a complete β-PVDF prior to electrostatic poling. 35 The β-PVDF is obtained from several methods such as direct solution casting, 36 by carrying out molecular epitaxy on potassium bromide, 3 high-pressure melt crystallization, application of strong electric field [37][38][39] hot pressing under cyclic pulsating pressure 40 and electrospinning, 41 among them mechanical stretching of α-PVDF films synthesized using solution casting or hot pressing of PVDF granules are most widely used. However, due to process constraints such as limited rate of evaporation, non-uniform thickness in solution casting, and the highly rough and sticky nature of films in hot processing, the thickness of resulting final β-PVDF films is often limited to $40 μm.…”

Section: Introductionmentioning

confidence: 99%

Strain and temperature induced phase changes inspin‐coated PVDFthin films

Kartheek

Neergat

Jonnalagadda

2023

Journal of Polymer Science

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Poly (vinylidene fluoride) (PVDF) is widely utilized for its unique pyro and piezoelectric properties related to its electro-active β-PVDF. In the past few decades, methods of producing β-PVDF by mechanical stretching of non-polar α-PVDF have been extensively documented. The aim of the present study is to understand the correlation between phase and mechanical behavior of β-PVDF obtained directly from spin-coating, and its stretch-induced transformation from α-PVDF. The effect of thermal annealing and in-plane anisotropy on mechanical properties of spin-coated PVDF freestanding thin films is investigated, under in-situ tensile loading, in conjunction with digital image correlation, to measure the full-field deformation. Stress-strain behavior of spin-coated β-PVDF and α-PVDF are correlated with mechanical stretchinduced phase transformation in α-PVDF. The mechanical strength and failure strain exhibited by spin-coated and annealed α-PVDF

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Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites

Kim

Jeon

et al. 2023

Korea-Aust. Rheol. J.

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Highly oriented PVDF molecular chains for enhanced material performance

Cited by 8 publications

References 52 publications

Structure–Piezoelectric Property Relationships of Thin Films Composed of Electrospun Aligned Poly(vinylidene fluoride) Nanofibers

Structure–Piezoelectric Property Relationships of Thin Films Composed of Electrospun Aligned Poly(vinylidene fluoride) Nanofibers

Strain and temperature induced phase changes inspin‐coated PVDFthin films

Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites

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