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Fabrication of conducting composite sheets using cost-effective graphite flakes and amorphous styrene acrylonitrile for enhanced thermistor, dielectric, and electromagnetic interference shielding properties
- Fabrication of conducting composite sheets using cost-effective graphite flakes and amorphous styrene acrylonitrile for enhanced thermistor, dielectric, and electromagnetic interference shielding properties
- Panwar, Varij; Gill, Fateh Singh; Rathi, Vikas; Tewari, V. K.; Mehra, R. M.; Park, Jong-Oh; Park, Sukho
- DGIST Authors
- Park, Sukho
- Issue Date
- Materials Chemistry and Physics, 193, 329-338
- Article Type
- Amorphous Polymer; Amorphous Polymers; Behavior; Capacitor; Capacitors; Carbon Nanotubes; Compression Molding; Cost Effectiveness; Costs; Decoupling Capacitor; Dielectric Properties; Differential Scanning Calorimetry; Electrochemical Energy Storage; Electromagnetic Interference Shielding; Electromagnetic Pulse; Electromagnetic Shielding; Electromagnetic Wave Interference; EMI Shielding Effectiveness; EMI Shielding Properties; Filled Polymers; Graphene; Graphite; Hardness; Nanoparticles; Oxide; Percolation Threshold; Poly(Styrene Co Acrylonitrile); Polymer Blends; Polymer Composites; Polyurethane Nanocomposites; Scanning Electron Microscopy (SEM); Shielding; Signal Interference; Solvents; Styrene; Temperature and Pressures; Thermistor; Thermistors; Thermogravimetric Analysis; X Band Frequency Range
- The fabrication of strong conducting composite sheets (CCSs) using a simple technique with cost-effective materials is desirable for capacitor, decoupling capacitor, and electromagnetic interference (EMI) shielding applications. Here, we used cost-effective graphite flakes (GFs) as a conducting filler and amorphous poly (styrene-co-acrylonitrile) (PSAN) as an insulating polymer to fabricate a CCS via a simple mechanical mixing and hot compression molding process in 2.5 h, with the aim to save time and avoid the use of toxic reagents, which are generally used in chemical methods. In the present method, the GFs are connected in diffusively adhere polymer matrix, controlled by temperature and pressure that generate the conduction in the CCSs. The resulting PSAN/GF CCSs were characterized by using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and hardness tests. The GFs penetrated the interfacial region of PSAN, thus improving the thermistor and dielectric properties (dielectric constant, AC conductivity, and dissipation factor) of the PSAN/GF CCSs. Furthermore, the PSAN/GF CCSs showed enhanced hardness and EMI shielding effectiveness (SE) properties in the X-band frequency range (8.5–12.5 GHz). The percolation theory was implemented to DC and AC conductivity. To detect the transition of the dielectric properties, the dielectric constant of the CCSs was analyzed with increasing volume fraction of GFs in the radio frequency region. The improved dielectric constant, AC conductivity, and dissipation factor of the PSAN/GF CCS, indicated a significant improvement in their EMI shielding properties in the X-band frequency range, which were measured using the waveguide method. The ac conductivity of PSAN/GF CCS shows stable behavior in the higher frequency ranges. The EMISE of PSAN/GF CCS were found to increase with increasing GF content due to the absorbance mechanism. © 2017 Elsevier B.V.
- Elsevier Ltd
- Related Researcher
Multiscale Biomedical Robotics Laboratory
Biomedical Micro/Nano Robotics; Biomedical Devices and Instruments
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