Processing influence on dielectric, mechanical, and electrical properties of reduced graphene oxide–TPU nanocomposites

Abstract

Two different reduced graphene oxides (rGOs) with similar concentration of oxygen and defects and differences in exfoliation were prepared to produce the rGO/thermoplastic polyurethane nanocomposites by solution blending (SB) and melt compounding (MC). Morphology, electrical, and dielectric properties were studied. Large agglomerates have been observed for the composites produced by SB and discrete and low agglomerated rGO particles in the case on the composites produced by MC. These morphological differences justify the observations in hardness, electrical conductivity, and even in the dielectric properties. The composites do not follow Jonscher's universal power law (UPL) and a linear trend between UPL factors (Log A vs n) has been observed for composites produced by SB, however, no trend is observed in the composites produced by MC, being the first time observed. Differences in the tunneling effect and breakage of H-bonds within the polymer can be suggested from the dielectric relaxation characterization.

The Role of Interfacial Interactions on the Functional Properties of Ethylene–Propylene Copolymer Containing SiO2 Nanoparticles

“…The results showed that the thermal conductivity of the silicon was improved by the addition of carbon-based nanofillers. Additionally, the role and influence of graphene and its derivatives in elastomer nanocomposites have been well documented previously [ 20 , 21 , 22 , 23 , 24 ]. The graphene/elastomer nanocomposite demonstrated improved mechanical properties, dynamic mechanical properties, and thermal stability [ 25 ].…”

Improved Dielectric Properties of Thermoplastic Polyurethane Elastomer Filled with Core–Shell Structured PDA@TiC Particles

“…Polymer-based dielectric composites have aroused great interest in researchers due to the materials being able to store electrical energy and their wide use in capacitors, voice control equipment, artificial muscles and other applications [ 1 , 2 , 3 , 4 ]. However, the dielectric constant ( k ) of most commercialized polymers are often very low ( k < 10), which cannot meet the requirements of further miniaturization of electronic components in practical applications.…”

Physicochemical characteristics of bio‐based thermoplastic polyurethane/graphene nanocomposite for piezoresistive strain sensor

“…Better interfacial interaction of reduced graphene oxide with TPU provides remarkable improvement in the dielectric and electrical properties. [ 17 ] The tensile strength of TPU improved, while elongation at break decreased drastically with the increase in graphene loading in TPU composite. [ 18 ] On the other hand, shape, size, and morphology of the conductive fillers affect its electrically conductive network which could be essential factor in stain sensing application.…”