Mechanical, dielectric and EMI shielding response of styrene acrylonitrile, styrene acrylonitrile/polyaniline polymer blends, upon incorporation of few layer graphene at low filler loadings
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The malfunction of electronic devices and many health-related issues may be caused due to electromagnetic interference (EMI) pollution. To overcome this problem a new set of material SAN/PANI/FLG hybrid composite with better EMI shielding properties is prepared using solution casting technique. Conductive polyaniline (PANI) is added (5 wt% and 10 wt%) to otherwise, an insulative polymer styrene acrylonitrile (SAN). Furthermore, few layer graphene (FLG) is added (0.1–1 wt%) to SAN/PANI polymer blends for preparation of SAN/PANI/FLG hybrid composites. The incorporation of PANI in SAN produces a phase separated morphology, whereas graphene appears in sheet like structure. For 0.1 wt% FLG/SAN/PANI-10 composite, total shielding effectiveness (SET) is enhanced from 1.1 to 24.3 dB (100 Hz), mainly due to enhanced dielectric characteristics. However, the maximum increase in tensile strength (49.6 MPa) and modulus (1.5 GPa) is observed for 0.5 wt% FLG/SAN/PANI-5.0 hybrid composite. The increase in dielectric properties and shielding efficiency of SAN/PANI/FLG may be credited to the accumulation of space charges or electric dipoles at the insulator conductor-interface.
KeywordsHybrid composites EMI shielding Dielectric properties Mechanical properties Polymer blends
Few Layer Graphene
Graphene Nano Sheets
Reduced Graphene Oxide
Sodium Dodecyl Sulphate
Ammonium Peroxide Sulphate
We thank Mr. Tanveer Zia for sample support and his valuable input.
ANK and RJ supervised and designed the experiments and co-wrote the manuscript. SS and MK helped in simulation model for plotting EMI shielding behavior and co-wrote the manuscript. All the co-authors read and approved the final manuscript.
The project was supported by the research grants from Higher Education Commission (HEC), Pakistan under the NRPU R&D Project-20-3052.
Compliance with ethical standards
The authors declare that they have no competing interests.
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