Degradation of physicomechanical properties of epoxy nanocomposites with carbon nanotubes upon heat and humidity aging

Kondrashov, S. V.; Merkulova, Yu. I.; Marakhovskii, P. S.; Dyachkova, T. P.; Shashkeev, K. A.; Popkov, O. V.; Старцев, О. В.; Molokov, M. V.; Kurshev, E.V.; Yurkov, G. Yu.

doi:10.1134/s1070427217050202

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…Figure 1 shows the water uptake in terms of percentage of the initial weight for the in-bulk cured samples at each condition. The graph is in good agreement with the typical behavior of water uptake for this kind of samples, previously stated in other studies [38,41,42]. It is observed that water uptake is more prevalent in the initial stages and then the weight gain is going less significant until the water saturation is reached at 2 weeks of aging.…”

Section: Resultssupporting

confidence: 91%

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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Section: Resultssupporting

confidence: 91%

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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“…Prolongo et al reported that by charging the CNTs with positive nature (NH 3 + ), better mechanical properties can be obtained as compared to unmodified CNTS. As per Yurkov et al, epoxy modified with functionalized CNT (FCNT‐COOH) showed better resistance against heat and humidity, unmodified epoxy showed 26% to 32% decrement in ultimate strength after boiling, whereas, FCNT‐COOH epoxy composite decreased by 16% to 17%. In his other article, he reported the effect of modifiers used for altering the CNT surface noncovalently, by using organosilicon fluorocontaining modifier he was able to improve the electrical conductivity and resistance against lightning of carbo‐fiber plastic composite .…”

Section: Introductionmentioning

confidence: 76%

Effects of carbon nanotube/polymer interfacial bonding on the long‐term creep performance of nanophased glass fiber/epoxy composites

et al. 2019

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This article is focused on prediction of the long‐term creep performance of glass fiber/epoxy (GE) composites reinforced with pristine carbon nanotube (CNT) and functionalized carbon nanotube (FCNT). 0.1 wt% of CNT and FCNT are added to GE composites to fabricate CNT‐GE and FCNT‐GE composite laminates, respectively. Flexural tests were carried out at room temperature (RT) and 120°C to assess the effect of environment temperature on the flexural properties of the aforesaid materials. FCNT‐GE showed highest improvement in flexural properties at RT followed by CNT‐GE composite and control GE composite, due to better stress transfer with strong chemical interfacial bonding. By using accelerated deformation at elevated temperature and time‐temperature superposition principle, long‐term creep behavior of GE, CNT‐GE, and FCNT‐GE composites at various reference temperatures (30°C, 60°C, 90°C, and 110°C) has been anticipated. Positive reinforcement efficiency is noted up to ~1010.5 and ~1012.5 years for CNT‐GE and FCNT‐GE, respectively at reference temperature of 30°C, following which it neutralized and moderately became negative. However, at higher temperature this time period is reduced abruptly due to unfavorable thermal stress generation at the CNT/polymer interface. Evaluation of thermomechanical properties were also carried out using dynamic mechanical analysis. Differential scanning calorimetry was used to investigate the variation in glass transition temperature due to CNT/FCNT addition to GE composite. Fractographic study was also carried out to know the mode of failure for CNT‐GE and FCNT‐GE composite flexural tested at room temperature.

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“…The presence of aggregates of carboxylated carbon nanotubes in the epoxy matrix positively influences the preservation of physicomechanical properties of the composite subjected to heat and humidity aging. Microscopic examination revealed structural features of the epoxy nanocomposite and their effect on the resistance of the composite to the heat and humidity aging [136].…”

Section: Resultsmentioning

confidence: 99%

Kinetic Features of Synthesis of Epoxy Nanocomposites

Иржак¹

2020

Nanorods and Nanocomposites

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Kinetic features of the formation of epoxy nanocomposites with carbon (nanotubes, graphene, and graphite), metal-containing, and aluminosilicate (montmorillonite and halloysite) fillers are considered. In contrast to linear polymers, epoxy nanocomposites are obtained only via the curing of epoxy oligomers in the presence of filler or the corresponding precursor. These additives may affect the kinetics of the process and the properties of the resulting matrix. A high reactivity of epoxy groups and a thermodynamic miscibility of epoxy oligomers with many substances make it possible to use diverse curing agents and to accomplish curing reactions under various technological conditions. The mutual effect of both a matrix and nanoparticles on the kinetics of the composite formation is discussed.

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Degradation of physicomechanical properties of epoxy nanocomposites with carbon nanotubes upon heat and humidity aging

Cited by 8 publications

References 10 publications

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

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

Effects of carbon nanotube/polymer interfacial bonding on the long‐term creep performance of nanophased glass fiber/epoxy composites

Kinetic Features of Synthesis of Epoxy Nanocomposites

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