Biodegradable nanocomposites based on PLA/PHBV blend reinforced with carbon nanotubes with potential for electrical and electromagnetic applications

The production of poly(lactic acid) (PLA) biodegradable blends with other biopolymers, such as poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and the introduction of carbon nanotubes (CNT) are promising solutions for electrical and electromagnetic application. PHBV has a great potential to improve the processing and toughness of PLA. The addition of CNT contributes to the electrical and electromagnetic properties of polymeric nanocomposites. PLA/PHBV blend (80/20) and PLA/PHBV blend-based nanocomposites with 0.5 and 1.0 wt% of CNT were produced. Morphology images showed the homogeneous dispersion of PHBV domains in PLA, and that CNTs are preferably dispersed in the PHBV phase. The CNT acted as a nucleating agent for the crystallization of PHBV and did not affect the thermal stability of the nanocomposites. CNT reduced the Izod impact strength; however, flexural properties were not affected. The addition of 1.0 wt% CNT resulted in better electrical properties (2.79-10-2 S/m) and an excellent result as electromagnetic interference shielding material (attenuation of approximately 96.9% of the radiation in X-band). Biodegradable nanocomposite based on PLA/PHBV blend reinforced with 1.0 wt% CNT presented interesting properties for possible applications in electronic device and military sectors.