Porous fluorinated polyarylene ether nitrile as ultralow permittivity dielectrics used under humid environment

Abstract

Dielectric materials demonstrating ultralow permittivity, excellent mechanical property and durability under humid environment are highly demanded for the rapid development of 5G communication system. Herein, a series of porous fluorinated...

Novel, flexible, and transparent thin film polyimide aerogels with enhanced thermal insulation and high service temperature

“…As illustrated in Fig. 11, the aerogels fabricated in this work have an improved performance compared to other materials such as the SiO 2 xerogel, 124,125 ODA-PMDA aerogel, 84 BPDA-ODA/6FAPB aerogel, 126 F88/MSQ, 127 CBDA/TFDB/OAPS aerogel, 128 PTFE/FEP, 129 and BTFB/ODPA/POSS aerogel 130 and are comparable to the FPEN film, 131 BaTiO 3 -silica aerogel 132 and BPDA-ODA/TFMB aerogel. 133…”

Hierarchically Architected Polyvinylidene Fluoride Piezoelectric Foam for Boosted Mechanical Energy Harvesting and Self-Powered Sensor

“…The high porosity of PVDF foam effectively reduces its dielectric constant, by occupying a large amount of air in the foam cells. Since the dielectric constant of air is only ∼1 at 1 kHz, it can effectively reduce the dielectric constant. − As demonstrated by Wang, the relationship between ε′ and output voltage ( V OC ) can be described using eq : where z represents the thickness of the sample, σ p ( z ) represents the piezoelectric charge density on the surface of the material, and ε′ represents the dielectric constant of the material. Low ε′ of the PVDF foam provided the premise for high V OC .…”

Porous structure contained polyimide film with enhanced dielectric properties upon high temperature

“…Moreover, porous fluorinated polyarylene ether nitrile film with an ultralow dielectric constant even under high humidity was obtained using the delayed phase inversion method. 40 Very recently, twodimensional covalent organic frameworks were also employed to fabricate the low-dielectric-constant materials due to their immense permanent porosities. 41 Thanks to the periodic-layered structures, high thermal conductivities were also achieved.…”

“…Recently, a 3D printed stochastic polyimide foam with a low dielectric constant of 2 and lightweight was also successfully prepared through the combination of 3D direct ink writing printing and tunable polymer phase behavior. Moreover, porous fluorinated polyarylene ether nitrile film with an ultralow dielectric constant even under high humidity was obtained using the delayed phase inversion method 40 . Very recently, two‐dimensional covalent organic frameworks were also employed to fabricate the low‐dielectric‐constant materials due to their immense permanent porosities 41 .…”