Semicrystalline Structure–Dielectric Property Relationship and Electrical Conduction in a Biaxially Oriented Poly(vinylidene fluoride) Film under High Electric Fields and High Temperatures

2015 ◽  
Vol 7 (36) ◽  
pp. 19894-19905 ◽  
Author(s):  
Lianyun Yang ◽  
Janet Ho ◽  
Elshad Allahyarov ◽  
Richard Mu ◽  
Lei Zhu
Keyword(s):  
Dielectric Property ◽  
Electric Fields ◽  
High Temperatures ◽  
Electrical Conduction ◽  
Vinylidene Fluoride ◽  
Property Relationship ◽  
Poly Vinylidene Fluoride ◽  
High Electric Fields

Novel Continuous Poly(vinylidene fluoride) Nanofibers

2006 ◽  
Vol 920 ◽  
Author(s):  
Xi Ren ◽  
Yuris Dzenis
Keyword(s):  
Electric Fields ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Fiber Spinning ◽  
Raw Material ◽  
Synthetic Fiber ◽  
Fiber Properties ◽  
Electrospinning Method ◽  
Poly Vinylidene Fluoride ◽  
High Electric Fields

AbstractPoly(vinylidene fluoride) (PVDF) is well known for its ferroelectric and piezoelectric properties. Currently, this polymer is used in applications in the form of films. PVDF fibers are expected to open up exciting new opportunities such as design and use of active textiles and composites. It is well-known that synthetic fiber properties improve substantially with the decrease of their diameter. However, conventional mechanical fiber spinning processes usually produce fibers with diameters in the range from tens to hundreds of microns. In this work, ultrafine, submicron-diameter continuous PVDF nanofibers were fabricated by electrospinning method. The method consists of spinning polymer solutions in high electric fields. Effects of process parameters on nanofiber diameter and morphology were studied. XRD and FTIR analyses of PVDF nanofibers were performed. The latter indicated that the initial á phase of the raw material was converted to â phase PVDF during electrospinning. As â phase is primarily responsible for the piezo- and ferroelectric properties of PVDF, the latter result is very encouraging. The demonstrated novel continuous PVDF nanofibers can be used in nanostructured active textiles and composites and can lead to unusual new designs for actuators and sensors.

Polarization study of poly(vinylidene fluoride) films under cyclic electric fields

2020 ◽  
Vol 60 (3) ◽  
pp. 645-656
Author(s):  
Shuang Qin ◽  
Xu Zhang ◽  
Zheng Yu ◽  
Feng Zhao
Keyword(s):  
Electric Fields ◽  
Vinylidene Fluoride ◽  
Polarization Study ◽  
Poly Vinylidene Fluoride

Novel Polar-fluoropolymer Blends with Tailored Nanostructures for High Energy Density and Low Loss Capacitor Applications

2012 ◽  
Vol 1403 ◽  
Author(s):  
Shan Wu ◽  
Minren Lin ◽  
David S-G. Lu ◽  
Lei Zhu ◽  
Q. M. Zhang
Keyword(s):  
Dielectric Loss ◽  
Energy Density ◽  
Electric Fields ◽  
Vinylidene Fluoride ◽  
High Energy ◽  
High Energy Density ◽  
Low Loss ◽  
Blend Films ◽  
Low Dielectric ◽  
High Electric Fields

ABSTRACTDielectric polymers with high energy density with low loss at high electric fields are highly desired for many energy storage and regulation applications. A polar-fluoropolymer blend consisting of a high energy density polar-fluoropolymer of poly(vinylidene fluoride-chlorotrifluoroethylene) (P(VDF-CTFE)) with a low dielectric loss polymer of poly(ethylene-chlorotrifluoroethylene) (ECTFE) was developed and investigated. We show that the two polymers are partially miscible which leads to blends with high energy density and low loss. Moreover, by introducing crosslinking to further tailor the nano-structures of the blends a markedly reduction of losses in the blend films at high field can be achieved. The crosslinked blend films show a dielectric constant of 7 with a dielectric loss of 1% at low field. Furthermore, the blends maintain a high energy density and low loss (∼3%) at high electric fields (> 250 MV/m).

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