Thermally expanded graphite polyetherimide composite with superior electrical and thermal conductivity

Thermally expanded graphite (EG) polymer composite has high potential for application in the modern thermo-electronic industry due to cost-effectiveness and excellent electrical thermal properties. In this study, we report conductivity enhancement of graphite/polyetherimide (EG/PEI) fabricated by a simple solution mixing technique. Expanded enable larger properties relative graphene nanoplatelets, through creation continuous graphitic networks composite. Solution casting technique enables preservation worm structure thus enabling development throughout composite, leading superior property enhancement. Measurements reveal ∼19 orders magnitude increase (yielding values up 969 Sm-1) inclusion 10 wt% EG filler, pure polyetherimide (electrical ∼ 1.2 × 10−17 Sm−1). Theoretical prediction using an effective medium approach reveals impact network on composites. We also find that with filler composition exhibits (k) value 7.3 Wm−1K−1, representing significant ∼3070% compared PEI (k 0.23 Wm−1K−1). Field Emmission Environment Scanning Electron Microscopy (FE-ESEM) preserved interconnected within allowing conductive interpenetrating filler. Raman spectroscopy, X-ray diffraction (XRD), Photoelectron Spectroscopy (XPS) analysis are further used characterize fillers EG/PEI nanocomposites. Our work identifies method as promising developing high-performance composites work.