【推荐下载】粘度的对性能的影响.最新.pdfVIP

Full Paper Influence of Melt Viscosity on the Structure and Properties of Electrically Conductive Nanocomposites Produced by Masterbatch Process Stefano Besco, Alessandra Lorenzetti, Denis Hrelja, Carlo Boaretti, Martina Roso, Dino Ferri, Michele Modesti* Electrically conductive polypropylene nanocomposites containing multi-walled carbon nano- tubes were produced by melt blending by dilution of a concentrate masterbatch containing 10 wt.% of filler. In order to promote polymer infiltration within primary agglomerates a ultra-low melt viscosity polypropylene grade has been used for masterbatch production. Moreover, three polypropylenes with different melt viscosities have been used for successive dilutions. Filler dispersion has been assessed by both indirect macroscale analyses and direct morphological investigations. Characterization showed percolation thresholds oc- curring for very low filler contents. During dilution, lower polymer viscosities lead to more effective residue agglomerates dispersion, hence better electri- cal properties. 1. Introduction behavior performances and thermal conductivity of polymers can be improved by the addition of such Due to their structure and outstanding properties, carbon nanostructured fillers depending on their level of disper- nanotubes (CNT) have attracted a lot of attention for their sion within the host matrix.