02354nas a2200265   4500008004100000022001400041245013200055210006900187260000800256300001200264490000700276520141300283653002101696653003401717653002601751653002401777653002201801653001601823653001301839653003701852100002501889700002201914700002201936856013001958       2017                        eng d  a0892-705700aPolypropylene-based conducting nanocomposites: effect of aspect ratio of second conducting filler on the electrical percolation0 aPolypropylenebased conducting nanocomposites effect of aspect ra  cJUN  a840-8540 v303 a<p>Powder-mixed polypropylene (PP)-graphite binary composites exhibit an electrical percolation threshold at 10 wt% graphite signifying insulator-semiconductor transition. Three conducting fillers such as carbon black (CB), sonicated expanded graphite (s-ExGr), and carbon nanofiber (CNF) are mixed with PP-7 wt% graphite binary composites. The electrical percolation threshold has been found to have inverse relation to the aspect ratio of second conducting fillers in hybrid composites. The aspect ratio of second conducting fillers varies in the order CB &lt; ExGr &lt; CNF. The electrical percolation threshold is found to vary for the hybrid composites as 2.2 wt% for CB addition, 0.75 wt% for ExGr addition, and 0.2 wt% for CNF addition in the PP-7 wt% graphite binary composites. When the aspect ratio of second conducting fillers increases, they reduce the barrier for the charge transport. The second conducting fillers occupy the interspace of graphite and alternating current studies show that the effective dielectric constant increases with the concentration of second conducting filler in the hybrid composites. The composites are characterized by transmission electron microscopy and scanning electron microscopy. Melt-crystallized PP-7 wt% graphite-CNF composites exhibit higher percolation threshold due to decrease in the polymer viscosity which increases the interparticulate distance.</p>10acarbon nanofiber10aConducting polymer composites10aElectrical properties10agraphite nanosheets10ahybrid composites10apercolation10ascanning10atransmission electron microscopy1 aRamanujam, B., T. S.1 aRadhakrishnan, S.1 aDeshpande, S., D.  uhttps://library.ncl.res.in/content/polypropylene-based-conducting-nanocomposites-effect-aspect-ratio-second-conducting-filler