Supercritical Fluids-Assisted Processing Using CO2 Foaming to Enhance the Dispersion of Nanofillers in Poly(butylene succinate)-Based Nanocomposites and the Conductivity

With the rapid development of electronic information technology, traditional metal conductive materials can no longer satisfy needs a wider industry. Poly(butylene succinate)/multiwalled carbon nanotubes (PBS/CNT) polymer nanocomposites with varied CNT content were prepared by HAAKE torque rheometer. The addition significantly improved crystallization, viscoelasticity, and mechanical properties as well thermal electrical conductivity. Conductivity PBS/CNT nanocomposite 5 wt% increased from 8.23 × 10–15 S m−1 pure PBS to 33.3 m−1, an increase 16 orders magnitude. Moreover, percolation threshold $${\mathrm{\varphi }}_{\mathrm{c}}$$ was 2.8 critical index 1.56, showing that network structure between 2 3D 2D dominated. To further improve conductivity, microcellular foams successfully fabricated batch foaming supercritical fluids (scCO2). conductivity foam reached 67.8 it 104% higher than corresponding solid nanocomposite.