Electromagnetic interference shielding behavior of chemically and thermally reduced graphene based multifunctional polyurethane nanocomposites: A comparative study

Abstract

This article presents the effect of exfoliation, dispersion, and electrical conductivity of graphene sheets onto the electrical, electromagnetic interference (EMI) shielding, and gas barrier properties of thermoplastic polyurethane (TPU) based nanocomposite films. The chemically reduced graphene (CRG) and thermally reduced/annealed graphene (TRG) having Brunauer–Emmett–Teller surface areas of 18.2 and 159.6 m2/g, respectively, when solution blended with TPU matrix using N,N‐dimethylformamide as a solvent. Graphene sheets based TPU nanocomposites have been evaluated and compared for EMI shielding in Ku band, electrical conductivity, and gas barrier property. TRG/TPU nanocomposite films showed excellent gas barrier against N2 gas as compared to CRG/TPU. The EMI shielding effectiveness for neat CRG and TRG graphene sheets is found to be −80, −45 dB, respectively, at 2 mm thickness. The EMI shielding data revealed that TRG/TPU nanocomposites showed better shielding at lower concentration (10 wt %), while CRG displayed better attenuation at higher concentrations. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47666.

Green Solvent Processed Cellulose/Graphene Oxide Nanocomposite Films with Superior Mechanical, Thermal, and Ultraviolet Shielding Properties

“…Interestingly, graphene is an emerging material having a one-atom thick, two-dimensional planner sheet of sp 2 bonded carbon possessing great potential applications including UV protection. − Furthermore, owing to the extent of π-conjugation in graphene, the two-dimensional graphene has several promising physical properties such as ultrahigh specific area, mobility of charge carrier quantum hall effects at room temperature, high flexibility, mechanical, thermal, electrical properties, and excellent optical transmittance. − These excellent features facilitate an enormous enhancement in the inherent characteristics of polymers after incorporating graphene into polymer matrices. Alhough the most frequently used nanoscale inorganic particles with inherently wide band gaps such as Anatase TiO 2 (3.2 eV), Rutile TiO 2 (3.0 eV), and ZnO (3.4 eV) can absorb radiation in the UV range, lead to incomplete absorbance .…”

A journey of thermoplastic elastomer nanocomposites for electromagnetic shielding applications: from bench to transitional research

“…Results obtained in this study clearly demonstrate that TPU/TRG nanocomposites are potential novel materials that can be utilized for protection against electromagnetic pollution. In similar research work, Bansala et al 156 prepared thermoplastic polyurethane (TPU) based nanocomposite films with chemically reduced graphene (CRG) and thermally reduced/annealed graphene (TRG). The EMI shielding effectiveness for neat CRG and TRG graphene sheets was reported (Fig.…”

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“…76−81 These exceptional characteristics have resulted in exponential growth in the use of graphene as an emerging material in high-end applications including sensors, flexible electronics, energy storage, composite materials, EMI and UV shielding, weather resistance, packaging, and barriers and biomedical. [82][83][84][85][86][87]1,88,89,12 Graphene, being the benchmark of material with unique properties and high possibility in myriad applications, has attracted much attention in the graphene-based polymer nanocomposites industry. While at the very beginning, graphene sheets were investigated by fundamental physicists, recent focus largely shifted toward graphene-based nanocomposites or hybrids for many practical applications.…”

“…The revolutionary wonder material “graphene” is a two-dimensional, single-atom thick planar sheet of sp 2 -hybridized carbon atom having a honeycomb-like crystal lattice arrangement . This sort of 2D atomic crystal structure and abundant presence of free π-electron with reactive sites for surface reactions renders graphene an extraordinary material with multifunctional properties such as high thermal conductivity (5000 W m –1 K –1 ), excellent electrical conductivity, high electron mobility at room temperature (250 000 cm 2 V –1 s –1 ), large surface area (2630 m 2 g –1 ) and very high Young’s Modulus (1 TPa). − These exceptional characteristics have resulted in exponential growth in the use of graphene as an emerging material in high-end applications including sensors, flexible electronics, energy storage, composite materials, EMI and UV shielding, weather resistance, packaging, and barriers and biomedical. − ,,,, …”