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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

Title
Fabrication of conducting composite sheets using cost-effective graphite flakes and amorphous styrene acrylonitrile for enhanced thermistor, dielectric, and electromagnetic interference shielding properties
Authors
Panwar, VarijGill, Fateh SinghRathi, VikasTewari, V. K.Mehra, R. M.Park, Jong-OhPark, Sukho
DGIST Authors
Park, Sukho
Issue Date
2017-06-01
Citation
Materials Chemistry and Physics, 193, 329-338
Type
Article
Article Type
Article
Keywords
Amorphous PolymerAmorphous PolymersBehaviorCapacitorCapacitorsCarbon NanotubesCompression MoldingCost EffectivenessCostsDecoupling CapacitorDielectric PropertiesDifferential Scanning CalorimetryElectrochemical Energy StorageElectromagnetic Interference ShieldingElectromagnetic PulseElectromagnetic ShieldingElectromagnetic Wave InterferenceEMI Shielding EffectivenessEMI Shielding PropertiesFilled PolymersGrapheneGraphiteHardnessNanoparticlesOxidePercolation ThresholdPoly(Styrene Co Acrylonitrile)Polymer BlendsPolymer CompositesPolyurethane NanocompositesScanning Electron Microscopy (SEM)ShieldingSignal InterferenceSolventsStyreneTemperature and PressuresThermistorThermistorsThermogravimetric AnalysisX Band Frequency Range
ISSN
0254-0584
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/4158
DOI
10.1016/j.matchemphys.2017.02.050
Publisher
Elsevier Ltd
Related Researcher
  • Author Park, Suk Ho Biomedical Micro/Nano Robotics Lab
  • Research Interests Biomedical Micro/Nano Robotics; Biomedical Devices and Instruments
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Collection:
ETC1. Journal Articles


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