Improved environmental stability, electrical and EMI shielding properties of vapor‐grown carbon fiber‐filled polyaniline‐based nanocomposite

Abstract

An all polymeric electrically conductive thermoset adhesive resin system is prepared for future lightning strike protection applications. Polyaniline (PANI)‐based hybrid nano‐composite is prepared by incorporating high apparent‐density type vapor grown carbon fiber (VGCF‐H) as additional conductive filler. Electrical, mechanical and electromagnetic interference (EMI) shielding properties of PANI‐dodecylbenzene sulfonic acid (DBSA), and divinylbenzene (DVB) system are improved with addition of VGCF‐H. Different weight percentages of VGCF‐H in the PANI‐DBSA/DVB matrix, are studied, and their effect on composite's properties are investigated. Electrical conductivity up to 1.89 S/cm with the addition of 5 wt% VGCF‐H is achieved, which is almost 300% improvement compared with previous system. However, the maximum flexural modulus is obtained at 3 wt% of VGCF‐H. The change in the electronic structure of PANI with the addition of VGCF‐H is investigated using Fourier transform infrared (FT‐IR) analysis. Rheological study and Differential scanning calorimetry analysis were employed to show the effect of VGCF‐H concentration on curing profile of the nanocomposites. EMI shielding properties of the composite with and without VGCF‐H are measured in X‐band frequencies and compared. Composite with 5 wt% VGCF‐H has shown EMI shielding effectiveness about 51 dB in X‐band, which is higher than the composite without VGCF‐H (around 22 dB). POLYM. ENG. SCI., 59:956–963, 2019. © 2018 Society of Plastics Engineers

Electromagnetic Interference Shielding Anisotropy of Unidirectional CFRP Composites

“…Besides, the EMI shielding performance of CFRP could also be improved by being coated with conductive paints filled with metallic particles or nanowires [ 30 ], but it still meets the challenge of poor dispersion of conductive fillers and poor wear. In recent years, intrinsically conducting polymers (ICPs) have also been used as fillers for EMI shielding [ 31 , 32 , 33 ], but their poor mechanical and thermal properties limit their practical applications [ 34 ].…”

Nanostructured cigarette wrapper encapsulated PDMS‐RGO sandwiched composite for high performance EMI shielding applications

“…The energy dissipation by free electrons or mobile charge carriers assists the microwave absorption. [47] It is also to be noted that the absorption property of the materials depends on their other properties like dielectric permittivity, conductivity, and permeability. On the other hand, the inhomogeneity within the material, that is, the phases of different impedance aids the internal multiple reflections of the EM radiation.…”

Using the external magnetic field of composites to control fiber orientation and enhancement of electrical conductivity

“…Kumar V et al [ 7 ] showed in research the electrical and mechanical properties of the composites improved significantly with the addition of the vapor grown carbon fiber (VGCF‐H) in Polyaniline‐Dodecylbenzenesulfonic acid/Divinylbenzene (PANI‐DBSA/DVB) composite. Electrical conductivity up to 300% improvement with the addition of 5 wt% VGCF‐H and the maximum flexural modulus is obtained at 3 wt% of VGCF‐H.…”