Robust Biocomposite Film of Polylactic Acid and Ferroferric Oxide as a Radar Absorbing Material

Rafles Sinaga(1), Wida Banar Kusumaningrum(2), Yana Taryana(3), Widya Fatriasari(4), Zuratul Ain Abdul Hami(5), Lisman Suryanegara(6*), Holilah Holilah(7), Yudi Darma(8)

(1) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia
(2) Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia
(3) Research Center for Electronics and Telecommunication, National Research and Innovation Agency, Bandung 40135, Indonesia
(4) Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia
(5) 4School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal Pulau Pinang 14300, Malaysia
(6) Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia
(7) Research Center for Biomass and Bioproducts, National Research and Innovation Agency, Cibinong 16911, Indonesia
(8) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia
(*) Corresponding Author


The polymer/ferroferric oxide (Fe3O4) foam and aerogel composites generally exhibit superior radar absorptivity performance. However, these composites have poor mechanical and thermal properties. This study manufactured a polylactic acid (PLA)/Fe3O4 bio-composite and evaluated the radar absorptivity, thermal, and mechanical properties of radar-absorbing material. The composites were prepared using a solvent casting method to mix PLA and Fe3O4 at varying concentrations, followed by evaporation, oven drying, and hot pressing into a film. Thermogravimetric analysis showed that the decomposition temperature of the PLA/Fe3O4-5% composite occurred at around 306 °C, which shifted to a lower decomposition temperature of PLA. The addition of 25 wt.% Fe3O4 improved the tensile modulus of neat PLA from 2.92 to 3.55 GPa. The vector network analyzer demonstrated that the addition of Fe3O4 at 25% improved the reflection loss of PLA from –5.17  to -25.83 dB at a thickness of 3 mm, with energy absorbed by 99.74% at frequency position 10.58 GHz. These results demonstrated that PLA/Fe3O4 composites have great potential in radar-absorbing practical applications.


radar absorptivity; thermal properties; mechanical properties; reflection loss; PLA/Fe3O4 biocomposites

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