Carboxymethyl cellulose sizing repairs carbon fiber surface defects in epoxy composites

Carbon and cellulose based nanofillers reinforcement to strengthen carbon fiber-epoxy composites: Processing, characterizations, and applications

“…Another novel cellulose that has scarcely been utilized with carbon fiber is carboxymethyl cellulose (CMC). Qiu et al (2021) studied the possibility of avoiding stress concentrations by introducing polar functional groups with 0, 0.025, 0.05, 0.075, and 1 g of CMC. The methodology of creating CMC-modified CFRPs can be visually shown within Figure 9C.…”

“…FIGURE 9(A) preparation process of multiscale cellulose interlayer(Zhang et al, 2021), (B) Illustration of the preparation of modified CFRPs and reaction mechanism(Qiu et al, 2020), (C) Illustration of the preparation of modified CFs, the preparation structure of CFRPs, illustration of the experimental process of modified CFRPs (Qiu et al, 2021)…”

Experimental and numerical investigations on the impact behaviour of pristine and patch-repaired composite laminates

“…Furthermore, from a study by Neogi et al [5], it appears that the triaxial stress-state near a fibre-matrix interface plays a significant role in such cracking processes, leading to cavitation on a nano-scale. Features on the fibre, due to its surface roughness, with a length-scale of the order of 50-100 nm, and the presence of sizing on the fibre surface can also play a role in the initiation processes of nanoscale cracks [6]. Indeed, Kimura et al [7] have recently developed techniques with a nano-scale spatial resolution for observing such nano-scale crack initiation in composites.…”

“…As described above, the numerical model is meso-scale in nature, in which cracks initiate in the CFRP at a nanoscale but then develop into meso-scale damage. Such nano-scale cracks and defects [5][6][7] have been shown to initiate in the matrix around fibres, etc. and these then trigger sub-micrometre intralaminar matrix cracks that initiate and propagate around the impact point.…”

Graphene Oxide/Polymer-Based Multi-scale Reinforcement Structures for Enhanced Interfacial Properties of Carbon Fiber Composites

“…Because of its particular strength, high stiffness, and resistance to acid erosion, carbon fiber (CF) reinforced polymer composites are widely used in the aerospace, renewable energy, and sporting events, among others. − Composite interfaces have a key part in determining the overall property composites. − Poor wettability, limited physical–chemical interactions, and smooth surface of CFs prevent the formation of a strong contact. − In recent years, the multiscale reinforcement structures constructed by nanomaterials to enhance the comprehensive properties of composites have attracted great interest. − Due to its extremely efficient interface, graphene oxide (GO) is regarded as a viable option for preparing high-performance composites, great chemical activities, and exceptional mechanical properties. − …”