A strong carboxymethyl cellulose-based bioplastic providing superior electromagnetic interference shielding and...

Although sustainable, bioplastics are constrained by insufficient mechanical properties and functionality. Modern electronics call for high-performance and multifunctional bioplastics to simultaneously mitigate electromagnetic interference (EMI) and plastic pollution. Inspired by nacre, we report a novel cellulose-based bioplastic through the self-assembly of carboxymethyl cellulose, reduced graphene oxide, carbon nanotubes and acetylene black. Benefiting from its distinctive layered structure, enhanced interfacial interactions and efficient conductive networks, the resulting bioplastic exhibits outstanding mechanical properties (tensile strength up to 109.22 MPa), water resistance and thermal stability. Moreover, it exhibits remarkable thermal conductivity and electrical conductivity (1204.47 S/m), along with an exceptional EMI shielding effectiveness of 39.63 dB at a thickness of 0.17 mm. Importantly, the bioplastic is environmentally friendly and biodegradable, with the ability to degradation in natural soil within 4 months. This work offers valuable insights into the design of multifunctional cellulose-based bioplastics, balancing superior performance with ecological sustainability.