Development of bonded joints using novel CNT doped adhesive films: Mechanical and electrical properties

Sánchez–Romate, Xoan F.; Jiménez‐Suárez, Alberto; Molinero, Javier; Sánchez, M.; Güemes, Alfredo; Ureña, A.

doi:10.1016/j.ijadhadh.2018.09.001

Cited by 20 publications

(19 citation statements)

References 31 publications

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“…relative resistance change ∆R/R o jumps to ∼1631%. To the authors' best knowledge, this relative resistance change, with progressive damage, is significantly higher than results reported in the literature for sensors based on dispersed CNTs/graphene in an epoxy adhesive [17][18][19][20][21][22][23][24][34][35][36][37].It indicates that preferential orientation of carbon nanotubes seems to be critical to differentiate microscale damage with respect to load direction. We also compared our results with recently reported studies on sensors based on aligned CNTs ( Table 1).…”

Section: Accepted Manuscriptcontrasting

confidence: 58%

“…Lim et al experimentally evaluated the sensing capability of CNT-epoxy and distinguished different types of damage mechanisms in composite-to-metal joints [19]. Most recently, CNT doping of commercially available adhesive films/polymeric films also attracted great interest for sensing applications [20][21][22][23][24]. Sanchez-Romate et al explored the sensing capability of bonded joints made with carbon nanotube doped adhesive films [21].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web

Kumar

Falzon

Hawkins

2019

Carbon

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Herein, we present a novel approach for damage sensing in adhesively bonded joints using a carbon nanotube single layer web (CNT-SLW) which marks a significant departure from the approach of dispersing CNTs within epoxy resins. In this work, a very thin, highly aligned CNT-SLW (densified thickness ~ 50 nm) with aerial density of 2.0 µg/cm 2 was horizontally drawn from a vertically aligned CNT forest, positioned over an adhesive film, which was, in turn, placed between two non-conductive composite adherents. This was followed by the application of heat and pressure to cure the adhesive. These joints were subjected to quasi-static and cyclic loading to investigate the damage sensing performance of a CNT-SLW. The CNT-SLW sensor, placed parallel to the load direction, exhibits remarkably high cyclic stability as well as exceptionally high sensitivity to damage initiation and accumulation. The resistance increase (∆R/R o % ∼1633%) is significantly higher than that of adhesive sensors with dispersed CNTs/graphene, reported in the literature. Morphological studies help to explain the sensing mechanism through interactions of the CNT-SLW with the evolution of micro-cracks. These results demonstrate the potential of

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Section: Accepted Manuscriptcontrasting

confidence: 58%

Section: Accepted Manuscriptmentioning

confidence: 99%

Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web

Kumar

Falzon

Hawkins

2019

Carbon

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“…CNT dispersion takes place by means of ultrasonication by using a previously optimized dispersion procedure [31]. It consists of a 20-min ultrasonication of a CNT aqueous solution at 0.1 wt%.…”

Section: Methodsmentioning

confidence: 99%

“…The effect of CNT dispersion on the mechanical and electrical properties of carbon fiber reinforced plastic (CFRP) bonded joints in their initial state has been characterized in previous works [31]. It has been concluded that these CNT adhesive films do not induce a detrimental effect on mechanical performance and they have proved to have excellent monitoring capabilities by means of electrical measurements [28].…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies, CNT reinforced adhesive films have demonstrated high sensing properties and a good capability to properly monitor crack evolution [28][29][30]. The dispersion procedure has also been optimized in order to achieve a degree of good homogenization without any substantial detriment to the mechanical properties [31]. This is achieved by means of ultrasonication of a CNT dispersion in an aqueous solution, which is assisted by the addition of a surfactant, namely, sodium dodecyl sulfate (SDS).…”

Section: Introductionmentioning

confidence: 99%

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Electrical Monitoring as a Novel Route to Understanding the Aging Mechanisms of Carbon Nanotube-Doped Adhesive Film Joints

et al. 2020

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Carbon fiber-reinforced plastic bonded joints with novel carbon nanotube (CNT) adhesive films were manufactured and tested under different aging conditions by varying the surfactant content added to enhance CNT dispersion. Single lap shear (SLS) tests were conducted in their initial state and after 1 and 2 months immersed in distilled water at 60 °C. In addition, their electrical response was measured in terms of the electrical resistance change through thickness. The lap shear strength showed an initial decrease due to plasticization of weak hydrogen bonds, and then a partial recovery due to secondary crosslinking. This plasticization effect was confirmed by differential scanning calorimetry analysis with a decrease in the glass transition temperature. The electrical response varied with aging conditions, showing a higher plasticity region in the 1-month SLS joints, and a sharper increase in the case of the non-aged and 2-month-aged samples; these changes were more prevalent with increasing surfactant content. By adjusting the measured electrical data to simple theoretical calculations, it was possible to establish the first estimation of damage accumulation, which was higher in the case of non-aged and 2-month-aged samples, due to the presence of more prevalent brittle mechanisms for the CNT-doped joints.

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Homogeneous dispersion of multiwalled carbon nanotubes via in situ bubble stretching and synergistic cyclic volume stretching for conductive LDPE/MWCNTs nanocomposites

Yang

Tong

et al. 2019

Polymer Engineering & Sci

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Low-density polyethylene (LDPE)/multiwalled carbon nanotubes (MWCNTs) nanocomposites with different foaming agent (OBSH) contents were innovatively prepared via In Situ Bubble Stretching (ISBS) and synergistic cyclic volume stretching. The cyclic convergent and divergent flow makes the MWCNTs repeatedly subjected to bubble stretching, which is conducive to the efficient dispersion of MWCNTs in the matrix. The thermal weight loss of neat OBSH and nanocomposite were characterized by thermal gravimetric analyzer (TGA), which indicated that the OBSH in the nanocomposite had been completely decomposed into gas during the plasticizing transport process. The results of morphology showed that the moderate content of OBSH had better dispersion effect on MWCNTs. At optimal OBSH content, the OBSH could generate enough gas and larger bubbles per unit time to provide greater expansion forces to do much for the dispersion of MWCNTs. The dynamic mechanical analysis (DMA) was further carried out and also proved that the content of OSBH was an important factor for the dispersion of MWCNTs. Moreover, the relationship between the OBSH content and conductivity was discussed in details. The improvement in conductive properties of nanocomposites associated with the use of the method can be attributed to a more homogeneous dispersion of MWCNTs. POLYM. ENG.

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Development of bonded joints using novel CNT doped adhesive films: Mechanical and electrical properties

Cited by 20 publications

References 31 publications

Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web

Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web

Electrical Monitoring as a Novel Route to Understanding the Aging Mechanisms of Carbon Nanotube-Doped Adhesive Film Joints

Homogeneous dispersion of multiwalled carbon nanotubes via in situ bubble stretching and synergistic cyclic volume stretching for conductive LDPE/MWCNTs nanocomposites

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