Abstract
In this work, a novel nanomaterial deposition technique involving the triboelectrification (TE) of glass fibers (GF) to create attractive charges on their surface was investigated. Through TE, continuous GF were positively charged thus, attracting negatively charged graphene oxide (GO) nanoparticles dispersed in a solution. The electrical charges on the glass fibers surface increased with the intensity of the TE process. The deposited GO coating was then chemically treated to obtain reduced graphene oxide (rGO) on the surface of GFs. The amount of coating obtained increased with the GO solution concentration used during the deposition process, as revealed by FESEM analysis. However, the same increment could not be noticed as a function of the intensity of the process. Both uncoated and coated GF were used to obtain single fiber microcomposites by using a bicomponent epoxy matrix. The fiber/matrix interfacial shear strength was evaluated through micro debonding tests, which revealed an increment of fiber/matrix adhesion up to 45% for rGO coated GF in comparison to the uncoated ones. A slight improvement in the electrical conductivity of rGO coated fibers through TE compared to conventional dip coating was also observed in terms of volumetric resistivity by a four-point probe setup.
Highlights
Fiber-reinforced polymer composites, providing high strength-to-weight as well as stiffness-to-weight ratios, have substituted metal counterparts in an array of highperformance structural applications in aerospace, automotive, and sports fields [1]
The effect of triboelectrification of glass fibers (GF) on the graphene oxide (GO) deposition is not so evident, as non-electrified fibers (NEF), 1T, and 2T specimens obtained with the same GO concentration have a similar optical appearance
For the coating process, a scrolling velocity equal to 5.4 rpm was selected since it represented a good compromise between the intensity of the surface electrification and the requirement to minimize the force applied on the fibers to preserve their mechanical properties
Summary
Fiber-reinforced polymer composites, providing high strength-to-weight as well as stiffness-to-weight ratios, have substituted metal counterparts in an array of highperformance structural applications in aerospace, automotive, and sports fields [1]. Interphase tailoring by sizing or coating by nanofillers (like carbon nanotubes and graphene) on reinforcing fibers (glass or carbon) has been approached through various techniques, like spraying [3,4,5,6,7], solution coating [8,9], dip coating [10,11,12,13,14,15,16], electrophoretic deposition (EPD) [17,18,19,20,21], and immersion [22,23] These methods allow the nanofillers to “anchor” on the fiber surface due to the chemical reactions between the functionalized nanofillers and the fiber’s surface groups. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) on the cured epoxy system (not reported for brevity) evidenced a glass transition temperature (Tg) equal to 83.8 ◦C and a thermal degradation temperature (evaluated as the maximum mass loss rate) of 352 ◦C
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