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Improved Electromagnetic Shielding Performance of Lightweight Compression Molded Polypyrrole/Ferrite Composite Sheets

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Abstract

An attempt has been made to design lightweight polypyrrole/carbon fibers and polypyrrole/carbon fibers/ferrofluid (Fe3O4 particles) composite sheets using novolac resin via compression molding for electromagnetic shielding applications. The optimized formulation has been achieved to get an excellent combination of thermal, mechanical, and electrical properties of the composite sheet. Structural and morphological studies were carried out by x-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. Polypyrrole/carbon fibers composite sheets shows maximum flexural strength and a flexural modulus of 62.4 ± 1 MPa and 0.60 ± 0.02 GPa, respectively, with total shielding effectiveness of 22.8 dB in the Ku-band (12.4–18 GHz) but when ferrofluid is added to the polypyrrole/carbon fibers composite system, flexural strength increases to 92.3 ± 1 MPa and the same trend has been observed for flexural modulus with a value of 0.65 ± 0.04 GPa. This multiphase lightweight polypyrrole composite sheet having 34 vol.% of carbon fibers and 4 vol.% of Fe3O4 nanoparticles offers total shielding effectiveness of 31.9 dB (>99.99% attenuation) in the Ku-band (12.4–18 GHz) frequency range with a thickness of ∼1.25 mm. This is accredited to high dielectric losses and magnetic losses in conducting composite sheets. The observed results suggest that lightweight compression molded polypyrrole composite sheets could be a potential commercial alternative for electromagnetic shielding applications.

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Acknowledgements

The authors wish to thank Director, NPL, and Director, DITE for their keen interest in the work. The authors also thank Dr. N. Vijayan and K.N. Sood for recording the XRD patterns and SEM micrographs, respectively.

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Authors and Affiliations

  1. Delhi Institute of Tool Engineering, Okhla, New Delhi, 110020, India

    Swati Varshney

  2. Polymeric and Soft Materials Section, National Physical Laboratory (CSIR), New Delhi, 110012, India

    S. K. Dhawan

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  1. Swati Varshney
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  2. S. K. Dhawan
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Correspondence to S. K. Dhawan.

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Varshney, S., Dhawan, S.K. Improved Electromagnetic Shielding Performance of Lightweight Compression Molded Polypyrrole/Ferrite Composite Sheets. J. Electron. Mater. 46, 1811–1820 (2017). https://doi.org/10.1007/s11664-016-5233-7

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  • DOI: https://doi.org/10.1007/s11664-016-5233-7

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