scholarly journals Multiscale Structural Evolution and Its Relationship to Dielectric Properties of Micro-/Nano-Layer Coextruded PVDF-HFP/PC Films

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2596
Author(s):  
Jie Wang ◽  
Daniel Adami ◽  
Bo Lu ◽  
Chuntai Liu ◽  
Abderrahim Maazouz ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
Structural Evolution ◽  
Extrusion Process ◽  
Structural Development ◽  
Interfacial Instabilities ◽  
Multilayered Structures ◽  
Dielectric Performance ◽  
Poly Vinylidene Fluoride

An understanding of the structural evolution in micro-/nano-layer co-extrusion process is essential to fabricate high-performance multilayered products. Therefore, in this work, we reveal systematically the multiscale structural development, involving both the layer architecture and microstructure within layers of micro-/nano-layer coextruded polymer films, as well as its relationship to dielectric properties, based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/polycarbonate (PC) system. Interestingly, layer architecture and morphology show strong dependences on the nominal layer thicknesses. Particularly, with layer thickness reduced to nanometer scale, interfacial instabilities triggered by viscoelastic differences between components emerge with the creation of micro-droplets and micro-sheets. Films show an enhanced crystallization with the formation of two-dimensional (2D) spherulites in microlayer coextruded systems and the oriented in-plane lamellae in nanolayer coextruded counterparts, where layer breakup in the thinner layers further changes the crystallization behaviors. These macro- and microscopic structures, developed from the co-extrusion process, substantially influence the dielectric properties of coextruded films. Mechanism responsible for dielectric performance is further proposed by considering these effects of multiscale structure on the dipole switching and charge hopping in the multilayered structures. This work clearly demonstrates how the multiscale structural evolution during the micro-/nano-layer coextrusion process can control the dielectric properties of multilayered products.

scholarly journals Achieving high performance poly(vinylidene fluoride) dielectric composites via in situ polymerization of polypyrrole nanoparticles on hydroxylated BaTiO3 particles

2019 ◽  
Vol 10 (35) ◽  
pp. 8224-8235 ◽  
Author(s):  
Xu Xie ◽  
Zhen-zhen He ◽  
Xiao-dong Qi ◽  
Jing-hui Yang ◽  
Yan-zhou Lei ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
In Situ Polymerization ◽  
Composite Particles ◽  
Poly Vinylidene Fluoride ◽  
Polypyrrole Nanoparticles

PPy@BTOH composite particles with a ‘mulberry-like’ structure are fabricated to prepare dielectric composites with excellent comprehensive dielectric properties.

Enhanced crystallization behaviors and dielectric performance of poly(vinylidene fluoride) film by induced polyamide-1

2021 ◽  
pp. 095400832110311
Author(s):  
Dandan Yuan ◽  
Rundi Yang ◽  
Yuanting Xu ◽  
Xufu Cai
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Polymer Composites ◽  
Loss Tangent ◽  
Vinylidene Fluoride ◽  
Crystallization Rate ◽  
Dielectric Materials ◽  
Crystallization Behaviors ◽  
Dielectric Performance ◽  
Poly Vinylidene Fluoride

Poly(vinylidene fluoride) (PVDF)-based composites attract tremendous attention as dielectric materials. However, their development has been limited due to the raised problem in the in-homogeneous polymer composites. In this work, a novel PVDF-based film incorporated with polyamide-1, containing the highest density of dipole among all polyamides, was prepared to improve the crystallization behaviors and dielectric properties. The results showed that the optimal concentration of polyamide-1 in PVDF was 6 wt.%. The crystallization rate of PVDF was improved in the presence of polyamide-1. Interestingly, the polyamide-1 was conductive to the formation of β form crystal of PVDF, which exhibited great electric performance. The dielectric constant of PVDF increased sharply and loss tangent still kept at a low level of 0.03@100 Hz when the concentration of polyamide-1 was 6 wt.%. This work may provide a new direction to design dielectric materials for PVDF blends.

Dielectric Properties and Thermal Conductivity of Poly(vinylidene fluoride)-Based Composites with Graphite Nanosheet and Nickel Particle

2019 ◽  
Vol 19 (6) ◽  
pp. 3591-3596 ◽  
Author(s):  
Lirong Wu ◽  
Dandan Yang
Keyword(s):  
Thermal Conductivity ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Ac Conductivity ◽  
Vinylidene Fluoride ◽  
Filler Loading ◽  
Graphite Nanosheet ◽  
Dielectric Performance ◽  
Poly Vinylidene Fluoride

The nickel (Ni) particles and graphite nanosheet (GNS) filled poly(vinylidene fluoride) (PVDF) composites were prepared by solution blending and hot-press processing in the magnetic field. The influence of Ni particles and GNS fillers for the structure, morphology, AC conductivity, dielectric properties and thermal conductivity of composites was investigated. The results showed that the β-phase crystals of PVDF matrix was increased obviously. The AC conductivity, dielectric constant and dielectric loss of PVDF/Ni/GNS composite reached to 10−9 s/cm, 62 and 0.39 when the filler loading was 11 wt.% at 102 Hz, respectively. At the ratio of 15 wt.% filler, the AC conductivity of PVDF/Ni/GNS composite was vastly improved to 10−6 s/cm, however, the dielectric constant increased to ~80 and dielectric loss was over 600 at 102 Hz. By comparing the dielectric performance of PVDF/Ni/GNS, PVDF/Ni and PVDF/GNS composites, it is found that the parallel arrangement of the filler conduces to improve the dielectric properties of the composites. Furthermore, the thermal conductivity of PVDF/Ni/GNS composites increased with the increase of Ni and GNS contents and the value raised to over 0.5 W/mK when filler loading was 15 wt.%.

scholarly journals 3D-printed barium titanate/poly-(vinylidene fluoride) nano-hybrids with anisotropic dielectric properties

2017 ◽  
Vol 5 (47) ◽  
pp. 12430-12440 ◽  
Author(s):  
N. Phatharapeetranun ◽  
B. Ksapabutr ◽  
D. Marani ◽  
J. R. Bowen ◽  
V. Esposito
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Vinylidene Fluoride ◽  
Anisotropic Dielectric ◽  
Poly Vinylidene Fluoride ◽  
3D Printed ◽  
Dielectric Devices

“3D-printed” anisotropy BTNFs/PVDF nanohybrids are successfully fabricated by the FDM technique which is attractive for developing novel functionalities in dielectric devices.

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