An Assessment of the Role of Fiber Coating and Suspending Fluid on the Deposition of Carbon Nanotubes onto Glass Fibers for Multiscale Composites

Abstract

Multiwall carbon nanotubes (MWCNTs) were ultrasonically deposited onto glass fibers by using either distilled water or a hydrolyzed silane. The role of the fiber coating (sizing) was investigated by depositing MWCNTs onto glass fibers with and without sizing. The interfacial shear strength (IFSS) between the MWCNT‐modified fibers and a vinyl ester matrix was analyzed by the microbond test. Increased electrical conductivity and surface roughness was achieved upon MWCNT deposition on the fibers. The use of a silane as suspending fluid renders moderate benefits with respect to distilled water, and its role is more critical in improving the IFSS between the MWCNT‐modified fibers and the matrix.

Influence of electrode configuration on impact damage evaluation of self-sensing hierarchical composites

“…The MWCNTs present on the surface of the glass fibers increase their roughness and surface area, and are expected to promote adhesion with the polymer matrix, as it has been previously reported (Ku-Herrera et al, 2016a). The oxidized MWCNTs possess –OH and –COOH functional groups and are held on the fiber surface by ester formation, hydrogen bonding, and epoxy ring opening reactions with the fiber sizing (Ku-Herrera et al, 2015).…”

“…The deposition of oxidized CNTs onto GF weaves was conducted following previously reported procedures (Isaac-Medina et al, 2019; Ku-Herrera et al, 2016a), with slight modifications. As shown in Figure 1, first, 60 mg of MWCNTs were dispersed in 40 mL of distilled water in an ultrasonic bath (42 kHz and 70 W) for 2 h at 60°C.…”

Interfacial shear strength characterization of GMA-grafted UHMWPE fiber/epoxy/nano clay hybrid nanocomposite materials

“…Microdroplets of nano epoxy resin with the size of 150-200 mm were formed on each ber by using a needle syringe. 33 Then, the epoxy resin droplets were allowed to cure at room temperature for 24 h followed by a post treatment at 80 C for 8 h. The microdroplet specimen was xed by the vernier caliper's blades at a xed gap distance of 50 mm that were placed on the test machine (Zwick universal testing machine-1446 60, load cell 20 N, Germany). Then, the ber, but not the droplet, moved between the blades.…”

Self-Sensing of Damage Progression in Unidirectional Multiscale Hierarchical Composites Subjected to Cyclic Tensile Loading

“…These multiscale composites will be named hereafter as architecture “ m ” for composites containing MWCNTs randomly dispersed within the matrix ( Figure 1 a), and architecture “ f ” for those where the MWCNTs are deposited onto the glass fibers ( Figure 1 b). The deposition of oxidized MWCNTs onto the glass fibers was conducted following the procedure reported in our previous works [ 28 , 29 , 30 ]. Briefly, oxidized MWCNTs are first ultrasonically dispersed in water, and then glass fiber tows are immersed into the MWCNT/water mixture, assisted by ultrasonic agitation.…”