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

摘要

Abstract With the rapid development of electronic information technology, traditional metal conductive materials can no longer satisfy the needs of a wider industry. Poly(butylene succinate)/multiwalled carbon nanotubes (PBS/CNT) conductive polymer nanocomposites with varied CNT content were prepared by a HAAKE torque rheometer. The addition of CNT significantly improved the crystallization, viscoelasticity, and mechanical properties as well as thermal and electrical conductivity. Conductivity of the PBS/CNT nanocomposite with 5?wt% CNT increased from 8.23?×?10–15 S?m?1 of pure PBS to 33.3 S?m?1, an increase of 16 orders of magnitude. Moreover, the electrical percolation threshold φcdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$${mathrm{varphi }}_{mathrm{c}}$$end{document} of the PBS/CNT nanocomposites was 2.8?wt% and the critical index was 1.56, showing that the conductive network structure was between 2 and 3D and 2D network structure dominated. To further improve the conductivity, microcellular foams were successfully fabricated by batch foaming with supercritical fluids (scCO2). The electrical conductivity of the PBS/CNT foam with 5?wt% CNT reached 67.8 S?m?1 and it was 104% higher than the corresponding solid nanocomposite.