Correlation between interfacial molecular structure and mechanics in CNT/epoxy nano-composites

Lachman, Noa; Wagner, H. Daniel

doi:10.1016/j.compositesa.2009.08.023

Cited by 153 publications

(94 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…130 MPa for typical pristine MWCNTs), r cnts is the radius of the MWCNTs (in the present study, the average r cnts was ~20 nm) and τ i is the interfacial shear strength between the MWCNTs and the epoxy matrix (τ i is approx. 30 MPa for typical pristine MWCNTs) (14). Figure 6 shows the experimental values (symbols) of fracture energy compared with the model predicted values (lines) for MWCNT/epoxy composites.…”

Section: Modelling Fracture Toughnessmentioning

confidence: 99%

See 1 more Smart Citation

Investigation into the toughening mechanism of epoxy reinforced with multi-wall carbon nanotubes

Zhang

Zhai

et al. 2015

E-Polymers

View full text Add to dashboard Cite

This study reports the reinforcement and fracture toughening mechanism of pristine multi-walled carbon nanotubes (MWCNTs) on epoxy matrix. The tensile strength and fracture energy (G IC ) of the epoxy polymer increased simultaneously upon the addition of a small amount of MWCNTs. The fracture surfaces of single-edgenotch three-point bending test specimens were analysed by scanning electron microscopy, and the double-notch four-point bending technique was used to investigate the fracture process by transmission electron microscopy, respectively. MWCNT pull-out and subsequent plastic void growth were found; meanwhile, fracture of MWCNTs was observed along the crack propagation path. The theoretical model of shearing band initiated by the stress concentrations around the MWCNTs is the dominant toughening mechanism. While the crack bridging of MWCNTs and the plastic void growth of epoxy also have a toughening effect.

show abstract

Section: Modelling Fracture Toughnessmentioning

confidence: 99%

“…Extensive research has been performed on CNT-reinforced toughening of polymer composites (7)(8)(9)(10). In contrast to rubber-or thermoplastic-toughened epoxy, those obtained by reinforcement with CNTs provide toughened epoxy without any decrease in the modulus (11)(12)(13)(14)(15).…”

Section: Introductionmentioning

confidence: 99%

Investigation into the toughening mechanism of epoxy reinforced with multi-wall carbon nanotubes

Zhang

Zhai

et al. 2015

E-Polymers

View full text Add to dashboard Cite

show abstract

“…We thus have two distinct measures of resistance to failure, one of which, the work of fracture, obtained by integration of the entire stress-strain curve up to the breaking point [45], will be dependent on sample geometry and testing mode. However, fracture energy determined in this way, though it cannot be interpreted as a true measure of toughness, does give a useful indication of fracture resistance.…”

Section: Toughness Of Compositesmentioning

confidence: 99%

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

2016

View full text Add to dashboard Cite

A protocol has been developed for the production of epoxy-based composites containing high-volume fractions of aligned carbon nanotubes. The nanotubes were fabricated as continuous fibres or aligned mats directly from the CVD reactor, in which they were synthesized. The block composites with highly aligned and tightly packed nanotube assemblies were prepared via epoxy resin infiltration, and their volume fraction, distribution, and internal porosity being analysed prior to mechanical testing. The samples were tested in both axial tension and three-point bending. The results show that the strength and stiffness enhancements were close to pro rata with the volume fraction of the carbon nanotubes added. The failure modes were distinctly different from those characteristic of the conventional aligned carbon fibre composites. The fracture surface showed considerable evidence of pull-out of bundles of (*50) nanotubes, but the pull-out appeared to involve the resin matrix which drew out along with the bundles. Subsidiary cracks were bridged by nanotube bundles giving structures reminiscent of crazes in glassy polymers, what constitutes the distinct toughness mechanism and higher resistance to the transverse cracks propagation.

show abstract

“…switching from MWCNT to SWCNT), keeping the filler volume fraction constant, as well as by increasing the interfacial strength (e.g. by using a stronger matrix or by functionalizing the nanotubes 11 ). These dependencies reverse when the filler is longer than the critical length.…”

Section: Resultsmentioning

confidence: 99%

“…3,[9][10][11] The major mechanism contributing to toughening of reinforced composites is the energy dissipated when the filler is pulled out from the matrix through the fracture surface. 12 The pullout energy arbitrarily shaped fillers.…”

mentioning

confidence: 99%

Nanocomposite toughness, strength and stiffness: role of filler geometry

Greenfeld

Wagner

2014

Nanocomposites

View full text Add to dashboard Cite

Correlation between interfacial molecular structure and mechanics in CNT/epoxy nano-composites

Cited by 153 publications

References 18 publications

Investigation into the toughening mechanism of epoxy reinforced with multi-wall carbon nanotubes

Investigation into the toughening mechanism of epoxy reinforced with multi-wall carbon nanotubes

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

Nanocomposite toughness, strength and stiffness: role of filler geometry

Contact Info

Product

Resources

About