Carbon nanofibers prepared by spinning of polymer blends and permittivity of CNFs composites

摘要

In this study, carbon nanofibers (CNFs) with the typical diameter ranging from 50 to 150nm were prepared from polymer blends of PAN/PMMA via wetspinning method and subsequent thermal treatment. The main factors that influence the diameter of CNFs, including molecular weight of PAN, mass ratio of PAN: PMMA and drawing ratio were studied. The characteristics of CNFs were investigated by TG, FTIR, Raman and XRD. The complex permittivity (ε'-jε"), complex permeability (μ'-jμ") and microwave absorption properties of carbon nanofibers/epoxy composites have been studied in Xband frequency range (8.2-12.4 GHz). ε',ε", μ' and μ" were found to increase with increased CNF contents.