Preparation and properties of natural rubber composite with CoFe2O4-immobilized biomass carbon

Designing versatile rubber as a multifunctional elastomer is of great importance, incorporating it with biomass-derived nanoblocks will mitigate environmental challenges. Here biosynthesized natural rubber (NR) composites with CoFe 2 O 4 -immobilized biomass carbon (BC) derived from macadamia nutshells were fabricated by facile mechanical mixing. Morphological analysis indicates that CoFe 2 O 4 nanoparticles are uniformly anchored on the surface of BC, forming intact electromagnetic loss networks in NR matrix. As a consequence, the as-fabricated NR/CoFe 2 O 4 @BC composites demonstrate enhanced mechanical, thermal, and electromagnetic performance. Particularly, NR/CoFe 2 O 4 @BC composite shows the best microwave attenuation capacity when CoFe 2 O 4 @BC loading is 40 phr, with the minimum reflection loss (RL) of −35.00 dB and effective absorption bandwidth (RL < −10 dB) of 1.60 GHz. All results indicate that this work open new paradigm for multiple applications based on biosynthetic elastomer with the sustainable biomass derived nanoblocks.