High beta-phase processing of polyvinylidenefluoride for pyroelectric applications

Tansel, Tunay

doi:10.1007/s10965-020-02073-w

Cited by 16 publications

(8 citation statements)

References 34 publications

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“…The main crystal structures are α, β, and γ [33], as shown in Figure 2. The distinct crystal forms of PVDF display diverse properties, leading to varying physical and chemical properties and applications [34]. Therefore, it is crucial to investigate the impact of the different crystal structures on PVDF's properties.…”

Section: Basic Modelmentioning

confidence: 99%

Microscopic Mechanism of Electrical Aging of PVDF Cable Insulation Material

Pang

Zheng

et al. 2023

Polymers

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In this study, the quantum chemical method was used to investigate the microscopic characteristics of α-poly viny difluoride (PVDF) molecules under the influence of an electric field, and the impact of mechanical stress and electric field polarization on the insulation performance of PVDF was analyzed through the material’s structural and space charge characteristics. The findings reveal that long-term polarization of an electric field leads to a gradual decline in stability and a reduction in the energy gap of the front orbital, resulting in the improved conductivity of PVDF molecules and a change in the reactive active site of the molecular chain. When the energy gap reaches a certain value, a chemical bond fracture occurs, with the C-H and C-F bonds at the ends of the backbone breaking first to form free radicals. This process is triggered by an electric field of 8.7414 × 109 V/m, which leads to the emergence of a virtual frequency in the infrared spectrogram and the eventual breakdown of the insulation material. These results are of great significance in understanding the aging mechanism of electric branches in PVDF cable insulation and optimizing the modification of PVDF insulation materials.

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Section: Basic Modelmentioning

confidence: 99%

Microscopic Mechanism of Electrical Aging of PVDF Cable Insulation Material

Pang

Zheng

et al. 2023

Polymers

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“…Furthermore, once dissolved, PVDF tends to crystallize in its non-polar α phase, which is the most thermodynamically stable [58,59,87]. Nonetheless, the possibility of inducing phase transitions using high polar solvents has been observed [59,61,62,65,92,93]. In particular, N-methyl-2-pyrrolidone (NMP) and N, N-dimethylformamide (DMF) are the most used solvents, although they are expensive and have a high environmental impact [55,[94][95][96][97].…”

Section: Pvdf Ink Formulationmentioning

confidence: 99%

“…Semi-crystalline PVDF exhibits several phases, whose relative quantity strongly depends on film processing [2,8,[53][54][55]. Among these, γ, and even more so, β polar phases are mostly recognized for providing a pyroelectric response [2,8,54,[56][57][58][59][60], but they are thermodynamically less stable than the non-polar α phase and difficult to obtain [58,59,61]. Moreover, to achieve pyroelectric operation in PVDF films, a macroscopic polarization process must be performed to obtain the alignment of polarized covalent bonds in the polar phases [2,8,51].…”

Section: Introductionmentioning

confidence: 99%

Gravure Printing for PVDF Thin-Film Pyroelectric Device Manufacture

et al. 2022

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Pyroelectric energy harvesting is one of the more recent and promising solid-state approaches for directly converting time-dependent temperature fluctuations into electric energy. Conventional printing technologies can offer many advantages for the production of pyroelectric thin-film-based devices, such as low cost, low temperature, the use of flexible substrates and shaping at the same time as deposition. Nevertheless, some issues related to low printed thickness and film-forming microstructure control need to be addressed. In this exploratory study, the possibility of exploiting the highly attractive gravure printing process for the potential industrial manufacture of flexible polyvinylidene fluoride (PVDF) thin-film pyroelectric devices was investigated. By the use of corona pre-treatment of the printing substrate and low-temperature polar solvent evaporation, multilayer gravure-printed PVDF pyroelectric devices were successfully manufactured for the first time, achieving a maximum generated current of 0.1 nA at 2.5 K/s from a device with an active area of 1 cm2. Considering the very low thermal inertia and performance scaling by the area expected for pyroelectric thin-film-based devices, combined with the upscaling potential of roll-to-roll gravure printing, our results provide new opportunities for on-demand, low-cost pyroelectric device manufacture and their integration in hybrid harvesters.

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“…Therefore, much effort has been dedicated to increasing the 𝛽-phase yield in PVDF films, as well as to potential applications of piezoelectric 𝛽-phase PVDF. [4,[9][10][11][12][13] A challenge for PVDF piezoelectric applications is the lack of relevant fabrication protocols for industrial-scale production. In research laboratories, PVDF is commonly fabricated using dropcasting, spin-casting, electrospinning, or Langmuir-Blodgett, in combination with either mechanical or electrical stress in postprocessing steps to improve the 𝛽-phase yield.…”

Section: Introductionmentioning

confidence: 99%

Volumetric 3D‐Printed Piezoelectric Polymer Films

Frick,

van Vliet,

Žukauskaitė

et al. 2024

Adv Materials Technologies

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A novel additive manufacturing route using a tailored resin containing Poly(vinylidene fluoride) Trifluoroethylene (PVDF‐TrFE) to 3D print piezoelectric films is demonstrated. Piezoelectric films are printed within 2 seconds in a single step by simultaneously focusing initiating and inhibiting excitations within the liquid resin to locally confine the photochemical reaction. The printed films are patterned with an array of holes with a diameter of 30 µm and a pitch of 55 µm. The piezoelectric response is homogeneous across the film, indicating that the print pattern does not impact the PVDF‐TrFE microstructure. Although the printed films contain only a small volume fraction of PVDF‐TrFE (3 wt.%), their piezoelectric response (d33 = 20.3 pC/N) is comparable to the highest literature values reported for PVDF‐TrFE films. The printed PVDF‐TrFE films are predominantly β‐phase, and no electrical poling, post‐processing, piezoelectric or inorganic additives are used in the fabrication. Analysis using piezoresponse force microscopy (PFM) and scanning electron microscopy (SEM) reveals that the enhanced piezoelectric response is due to the preferential formation of oriented PVDF‐TrFE phases during printing. These results demonstrate how the dedicated design of photoactive resins in combination with volumetric additive manufacturing can be applied to rapidly fabricate functional 3D structures.

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High beta-phase processing of polyvinylidenefluoride for pyroelectric applications

Cited by 16 publications

References 34 publications

Microscopic Mechanism of Electrical Aging of PVDF Cable Insulation Material

Microscopic Mechanism of Electrical Aging of PVDF Cable Insulation Material

Gravure Printing for PVDF Thin-Film Pyroelectric Device Manufacture

Volumetric 3D‐Printed Piezoelectric Polymer Films

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