01889nas a2200229   4500008004100000022001400041245010200055210006900157260010000226300001400326490000700340520096800347653004401315653002601359653001301385653001301398653005301411100002501464700002601489700002201515856012201537       2010                        eng d  a0266-353800aPolyethersulfone-expanded graphite nanocomposites: charge transport and impedance characteristics0 aPolyethersulfoneexpanded graphite nanocomposites charge transpor  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcNOV0  a2111-21160 v703 a<p>Polyethersulfone (PES)-expanded graphite nanocomposites have been prepared by solution blending route after sonicating expanded graphite in dichloromethane. It has been observed that ultrasonication results in nanosheets formation leading to a low percolation threshold of 3 wt.%. At 5 wt.% filler loading the conductivity is of the order of 10(-2) S/cm. Hopping type of charge transport occurs at 3.2 wt.% expanded graphite in PES below which capacitive effects couple. The effective dielectric constant at low frequency increases with filler concentration. Impedance measurement has been carried out to evaluate interfacial capacitance which, for 3.2 wt.% expanded graphite addition in PES, increases to 110 pF from 32 pF for 1 wt.% expanded graphite in the polymer. DSC analysis shows an increment of 12 C in the T(g) of PES with 3 wt.% expanded graphite suggesting interaction between the polymer and filler. (C) 2010 Elsevier Ltd. All rights reserved.</p>10aDifferential scanning calorimetry (DSC)10aElectrical properties10aModeling10aPolymers10aScanning/transmission electron microscopy (STEM)1 aRamanujam, B., T. S.1 aMahale, Rajashree, Y.1 aRadhakrishnan, S.  uhttps://library.ncl.res.in/content/polyethersulfone-expanded-graphite-nanocomposites-charge-transport-and-impedance-0