Effect of morphology and defectiveness of graphene-related materials on the electrical and thermal conductivity of their polymer nanocomposites

Abstract

In this work, electrically and thermally conductive poly (butylene terephthalate) nanocomposites were prepared by in-situ ring-opening polymerization of cyclic butylene terephthalate (CBT) in presence of a tin-based catalyst. One type of graphite nanoplatelets (GNP) and two different grades of reduced graphene oxide (rGO) were used. Furthermore, high temperature annealing treatment under vacuum at 1700°C was carried out on both RGO to reduce their defectiveness and study the correlation between the electrical/thermal properties of the nanocomposites and the nanoflakes structure/defectiveness. The morphology and quality of the nanomaterials were investigated by means of electron microscopy, x-ray photoelectron spectroscopy, thermogravimetry and Raman spectroscopy. Thermal, mechanical and electrical properties of the nanocomposites were investigated by means of rheology, dynamic mechanical thermal analysis, volumetric resistivity and thermal conductivity measurements. Physical properties of nanocomposites were correlated with the structure and defectiveness of nanoflakes, evidencing a strong dependence of properties on nanoflakes structure and defectiveness. In particular, a significant enhancement of both thermal and electrical conductivities was demonstrated upon the reduction of nanoflakes defectiveness.

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Graphene: Status and Prospects
• Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
• Raman spectroscopy as a versatile tool for studying the properties of graphene
• High yield production of graphene by liquid phase exfoliation of graphite
• Synthesis and characterization of atomically-thin graphite films on a silicon carbide substrate
• Structural analysis of polycrystalline graphene systems by Raman spectroscopy
• Effect of thermal annealing on the heat transfer properties of reduced graphite oxide flakes: a nanoscale characterization via scanning thermal microscopy

Cited by in corpus (7)

• Super nucleation and orientation of poly (butylene terephthalate) crystals in nanocomposites containing highly reduced graphene oxide
• Effect of processing conditions on the thermal and electrical conductivity of poly (butylene terephthalate) nanocomposites prepared via ring-opening polymerization
• Properties of graphene-related materials controlling thermal conductivity of their polymer nanocomposites
• A facile and low environmental impact approach to prepare thermally conductive nanocomposites based on polylactide and graphite nanoplatelets
• Molecular junctions for thermal transport between graphene nanoribbons: covalent bonding vs. interdigitated chains
• Morphology and properties evolution upon ring-opening polymerization during extrusion of cyclic butylene terephthalate and graphene-related-materials into thermally conductive nanocomposites
• Decoupled trends for electrical and thermal conductivity in phase-confined CNT co-continuous blends