Lightweight and solution processible thin sheets of poly(o-toluidine)-carbon fiber-novolac composite for EMI shielding

Abstract

An attempt has been made to generate lightweight and processible thin sheets of poly (o-toluidine)-carbon fiber (PoTCF) composite for electromagnetic interference shielding. PoTCF composite synthesized by oxidative emulsion polymerization was physically blended with different weight ratios of novolac resin to prepare a new class of composite material, which was further processed to form thin sheets (thickness of $0.85 mm) by a compression moulding technique. In situ incorporation of carbon fiber into the polymer matrix leads to the formation of composites with improved mechanical, thermal, electrical and shielding properties, which were further optimized by varying the amount of novolac resin in the sheets.Structural and morphological studies were carried out by UV-vis, FTIR, XRD and SEM. PoTCF composite sheets with 50 wt% loading of novolac resin have flexural strength of 36.0 MPa and exhibit a shielding effectiveness of 24 dB in the X-band (8.2-12.4 GHz) at a critical thickness of $2.11 mm, which is more than the limit required for techno-commercial applications. Therefore, indigenously fabricated polymerbased sheets would be potentially useful for making durable enclosures for electronic equipment.

Conductive poly (o-anisidine)/poly (ethylene terephthalate) nonwoven composite: Investigation of synthesis parameters and electromagnetic shielding effectiveness

“…The polypyrrole/nylon-6 fabric composite prepared by multiple depositions of polypyrrole layers onto nylon-6 could effectively be used in EMI shielding with an attenuation of 40 dB in the 50 MHz-13.5 GHz frequency range [10]. The results of a very recent study including the preparation of poly(o-toluidine)/carbon fiber/novalac thin sheets showed that the material could have potential uses in durable enclosures for electronic equipment with an EMSE performance of 24 dB at 8-12 GHz [11]. Studies on the EMI shielding performances of polypyrrole/nylon-lycra [12], polythiophene/PET [13], polyaniline/carbon fiber [14] polyaniline/cotton [15,16], and polyethylenedioxythiophene/PET [17] were also examined under different frequencies.…”

Synthesis, structural, morphological, optical and electrical conductivity properties of aluminium doped ZnO/POLY (o-TOLUIDINE) (Al-ZnO-POT) nanocomposites

“…The peaks at 1156 cm -1 and 810cm -1 corresponding to C-H plane stretching vibration of quinoid rings and C-H out plane bending vibration of benzenoid rings. The formation of Al-ZnO-POTnanocomposites showed an absorption peaks are centered at around 3459, 1634, 1371and 527 cm -1 respectively [23]. Comparing to that of pure POT polymer, the absorption peaks of Al-ZnO-POT nanocomposites have been shifted to lower wave numbers, the shift of absorption peaks may be corresponding to the formation of hydrogen bonding between Al-ZnO and the -NH group of POT polymer on the surface of the Al-ZnO nanoparticles.…”

Nitrogen–Sulfur Co-Doped Reduced Graphene Oxide-Nickel Oxide Nanoparticle Composites for Electromagnetic Interference Shielding

“…The SE A and SE R can be described in terms of R, T, |S 11 |, and |S 21 | as 58,64 i k j j j y { z z z i k j j j j j y…”