Thermal‐induced dielectric response in mechanically durable polyvinylidene fluoride–kapok encapsulated polyethylene glycol composite films

Gong, Yutie; Li, Zhenzhen; Li, Hairong; Wu, Wenjing; Pei, Xianglin; Tu, Junyang; Zhou, Weijie; Jiang, Ming; Gong, Wei

doi:10.1002/pen.25982

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…For example, various molecular ferroelectric crystals mimicking perovskite structure are capable of exhibiting thermal‐induced bistable or pulse responses due to ferroelectric‐paraelectric phase transition 11–14 ; formation/disappearance of percolation networks caused by the crystallization/melt transition of hexadecane resulted in a strong dielectric switching effect 15 ; dielectric pulsing or switching effects was also found in multilayer macrostructured organic materials due to differences in interfacial polarization based on a two‐ or three‐layer model formed by alkane crystallization 16,17 ; we have also previously found significant dielectric switching effects by constructing unique ionic gel system and alkane‐Pickering emulsion system, respectively 18,19 . Thermo‐responsive dielectric behavior is also observed in other composite systems 20–22 . In general, each design strategy represents the creation of a new thermo‐responsive dielectric material.…”

Section: Introductionmentioning

confidence: 86%

“…18,19 Thermo-responsive dielectric behavior is also observed in other composite systems. [20][21][22] In general, each design strategy represents the creation of a new thermo-responsive dielectric material. This material design process must also imply a large number of feasibility verification experiments, constant trial and error, and long lead times.…”

Section: Introductionmentioning

confidence: 99%

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Simple regulation of dielectric pulsing properties of polyethylene glycol‐poly(vinylidene fluoride) coaxial nanofiber films based on blow‐spinning process

Li,

Gong,

et al. 2023

Polymer Engineering & Sci

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Understanding the relationship between the fabrication process and the dielectric behavior of thermo‐responsive dielectric materials and accordingly optimizing the dielectric response behavior through simple regulation is critical to advancing their practical applications. For this purpose, we systematically analyze and demonstrate the effects of blow‐spinning process parameters, the feed rate and airflow pressure, on the orientation of poly(vinylidene fluoride) (PVDF) chains, the individual phase fractions of PVDF, the structure of the core‐sheath nanofibers, the mechanical properties, and the dielectric pulsing properties in polyethylene glycol (PEG)‐PVDF core‐sheath fiber films, and achieve the goal of effectively regulating the thermo‐responsive dielectric behavior. In particular, by increasing the airflow pressure, the polar phase fraction of the PVDF can be effectively increased, thus strengthening the dielectric pulsing effect. The significant influence of the processing parameters on the nanofiber structure also allows us to tailor the strength and toughness of the nanofiber films over a wide range by adjusting the feed rate and airflow pressure. Our work shows that the regulation of feed rate and airflow pressure can be used as an effective strategy to optimize the dielectric pulsing and mechanical properties of PEG‐PVDF films, enabling a simple and low‐cost performance optimization of thermo‐responsive dielectric materials.Highlights Effective regulation of thermal dielectric behavior by tuning process parameters. Simple tuning of mechanical properties of nanofiber films over a wide range. High ratio of β‐ and γ‐phases of PVDF by solution blow spinning. Major polar phases contribute to improved mechanical and dielectric properties.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Simple regulation of dielectric pulsing properties of polyethylene glycol‐poly(vinylidene fluoride) coaxial nanofiber films based on blow‐spinning process

Li,

Gong,

et al. 2023

Polymer Engineering & Sci

Self Cite

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“…A thermal‐induced dielectric susceptibility has been recently observed in PEG‐contained composites. [ 27–29 ] The switching between high and low dielectric states can be triggered by the crystalline–amorphous phase transition of PEG. However, the common problem of the above PEG composite systems is that nano‐ or microparticles need to be used as carriers to adsorb PEG, which increases the complexity and cost of the system and reduces the flexibility of the films.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐responsive dielectric pulse in poly(vinylidene fluoride)/polyethylene glycol fibrous mats

Zhou

Gong

et al. 2022

Polymer Engineering & Sci

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Thermo‐responsive dielectric materials have attracted broad attention in smart electronic device applications. Here, we present a facile one‐step fabrication technique of thermo‐responsive dielectric fibrous mats via efficient solution blow spinning of poly (vinylidene fluoride)/polyethylene glycol (PVDF/PEG). A strong room‐temperature dielectric pulse is triggered by thermally induced crystalline–amorphous phase transition of the PEG. The PVDF, serving as a host, enables the fibrous mats not only to attain solid–solid phase transition but also to spontaneously provide the self‐supportability. The dielectric pulse mechanism in PVDF/PEG based on crystalline–amorphous phase transition is clearly demonstrated. The all‐polymer dielectric pulsing composites hold great potential in next‐generation electronic engineering, exemplified by the creation of flexible, long‐service‐life, and low‐cost smart electrical devices.

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Properties, characterization and biomedical applications of polyvinylidene fluoride (PVDF): a review

Concha,

Timóteo,

Duarte

et al. 2024

J Mater Sci

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Polyvinylidene fluoride (PVDF) boosted its technological applications because of its piezoelectric and pyroelectric properties, together with mechanical, chemical, and thermal resistance. In this review, we address the PVDF chemical structure and its synthesis procedure, also describing the occurrence of polymorphism (alpha (α), beta (β), gamma (γ), and delta (δ) of this semicrystalline polymer, and the processes involved in phase transformation that govern the adaptability of the PVDF crystalline phases and properties for several industrial uses. It can be used as a component of implants and sutures, as engineering plastic to play a structural role in aggressive environments, acting in the field of process control as a component of transducers and sensors, as well as in the synthesis of separation membranes, fuel cells, and a long list of new applications that include an important role in robotics. The main physicochemical techniques used for PVDF characterization, i.e., differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy, that highlight its unique properties, are also discussed, showing the versatility of PVDF for a range of biomedical and pharmaceutical applications.

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Thermal‐induced dielectric response in mechanically durable polyvinylidene fluoride–kapok encapsulated polyethylene glycol composite films

Cited by 3 publications

References 25 publications

Simple regulation of dielectric pulsing properties of polyethylene glycol‐poly(vinylidene fluoride) coaxial nanofiber films based on blow‐spinning process

Simple regulation of dielectric pulsing properties of polyethylene glycol‐poly(vinylidene fluoride) coaxial nanofiber films based on blow‐spinning process

Thermo‐responsive dielectric pulse in poly(vinylidene fluoride)/polyethylene glycol fibrous mats

Properties, characterization and biomedical applications of polyvinylidene fluoride (PVDF): a review

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