One-step amino-functionalization of milled carbon fibre for enhancement of thermo-physical properties of epoxy composites

Zabihi, Omid; Ahmadi, Mojtaba; Shafei, Sajjad; Seraji, Seyed Mohsen; Oroumei, Azam; Naebe, Minoo

doi:10.1016/j.compositesa.2016.06.005

Cited by 47 publications

(34 citation statements)

References 50 publications

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“…This can be explained by the fact that a higher concentration of nanoclay increased the viscosity of the nanomodified epoxy resin system, which led to difficulty in obtaining a homogeneous mixture during the mixing process. Also, it has been frequently argued in the discussion regarding composites fabrication that the introduction of a high amount of nanofiller endlessly leads to a major issue, namely, poor dispersion and as a consequence, ruining the ultimate properties of the nanocomposites . More conspicuous clay agglomerates were observed, as displayed by the fractured surface morphology of the composite with 10 wt% nanoclay content.…”

Section: Resultsmentioning

confidence: 99%

The effect of nanomodified epoxy on the tensile and flexural properties of Napier fiber reinforced composites

et al. 2019

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The tensile, flexural, and morphological properties of Napier fiber reinforced nanomodified epoxy composites were investigated. Untreated and alkali‐treated Napier fibers, as well as nanoclay and epoxy resin, were used to fabricate Napier fiber reinforced nanomodified epoxy composites by using cold press compression machines. Napier fiber was treated with 5% dilute sodium hydroxide (NaOH) solution for 6 h. Varying amounts of nanoclay filler (3, 5, and 10 wt%) were mixed with the epoxy resin prior to fabricating the Napier fiber reinforced nanomodified epoxy composites. The results of mechanical testing indicated that the alkali‐treated Napier fiber reinforced nanomodified epoxy composites incorporating 5 wt% nanoclay exhibited the highest flexural and tensile properties. Morphological analysis was then conducted to further analyze the fractured specimens following the mechanical tests. The scanning electron microscope images of the Napier fiber reinforced nanomodified epoxy composites that contained 5 wt% nanoclay revealed good interfacial bonding between the matrix and the reinforcement.

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Section: Resultsmentioning

confidence: 99%

The effect of nanomodified epoxy on the tensile and flexural properties of Napier fiber reinforced composites

et al. 2019

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“…The weight loss below 100 °C for the three samples could be attributed to the water deintercalation. The pristine ND is inherently highly stable in nitrogen and shows a weight loss after 400 °C, which can be ascribed to the degradation of graphitic structures, adventitious hydrocarbon contamination, and the oxygen‐containing groups on the ND surface, as determined by the FT‐IR spectrum . The ND‐NH 2 degraded at about 500 °C, which is higher than the temperature at which the pristine ND degraded owing to the protective layer formed by the condensation reaction between the adsorbed silane molecules and unreacted OH groups on the pristine ND surface .…”

Section: Resultsmentioning

confidence: 99%

“…Using the three‐point bending mode for the flexural property test can give a deep insight into the mechanical behavior of EP composites as it is a mix of tensile and compressive forces to which the EP composites will actually be subjected . The flexural strength and modulus of the EP/ND and EP/ND‐XSBR nanocomposites are plotted as functions of filler contents from 0.1 to 0.6 wt % in Figure.…”

Section: Resultsmentioning

confidence: 99%

Enhanced interfacial interaction by grafting carboxylated‐macromolecular chains on nanodiamond surfaces for epoxy‐based thermosets

Zhang

Park

2017

J Polym Sci B Polym Phys

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A novel core‐shell‐structured carboxylated‐styrene butadiene rubber (XSBR)‐functionalized nanodiamond (ND‐XSBR) was synthesized and characterized. Epoxy (EP) nanocomposites toughened by pristine ND and ND‐XSBR were investigated and compared. The ND‐XSBR‐reinforced nanocomposite exhibited mechanical properties superior to those of the one filled by pristine ND. At a low‐filler loading, the ND‐XSBR exhibited an impressive toughening effect. The maximum flexural strength was shown when the filler loading was as low as 0.1 wt % for the EP/ND‐XSBR nanocomposite. Furthermore, enhanced fracture toughness and fracture energy were shown by surface functionalization, representing enhanced compatibility between the ND‐XSBR and EP matrix. The glass transition temperature (Tg) and storage modulus of the nanocomposites were studied, and the EP/ND‐XSBR0.1 nanocomposite exhibited the highest Tg owing to the stronger interfacial interaction. The EP/ND‐XSBR0.2 exhibited higher storage modulus and Tg than the EP/ND0.2, because the higher interfacial interaction can restrict the molecular mobility of the EP by the functionalized ND‐XSBR. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1890–1898

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“…Additionally, the ability of DNA modifier to react with epoxy through chemical bonding keeps clay layers to be firmly embedded within the matrix while load is applied. This will result in a more effective stress-transfer mechanism64. In contrast, despite the fact that epoxy monomer can also diffuse into stacked m-clay layers due to its initial d -spacing resulting from long alkyl chain quaternary ammoniums, its interactions with epoxy molecules still remains as weak as van der Waals forces, which can act like flaws in composites causing their premature failures and delamination, under mechanical loadings.…”

Section: Results and Disccusionsmentioning

confidence: 99%

Fish DNA-modified clays: Towards highly flame retardant polymer nanocomposite with improved interfacial and mechanical performance

Zabihi

Ahmadi

Khayyam

et al. 2016

Sci Rep

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Deoxyribonucleic Acid (DNA) has been recently found to be an efficient renewable and environmentally-friendly flame retardant. In this work, for the first time, we have used waste DNA from fishing industry to modify clay structure in order to increase the clay interactions with epoxy resin and take benefit of its additional thermal property effect on thermo-physical properties of epoxy-clay nanocomposites. Intercalation of DNA within the clay layers was accomplished in a one-step approach confirmed by FT-IR, XPS, TGA, and XRD analyses, indicating that d-space of clay layers was expanded from ~1.2 nm for pristine clay to ~1.9 nm for clay modified with DNA (d-clay). Compared to epoxy nanocomposite containing 2.5%wt of Nanomer I.28E organoclay (m-clay), it was found that at 2.5%wt d-clay loading, significant enhancements of ~14%, ~6% and ~26% in tensile strength, tensile modulus, and fracture toughness of epoxy nanocomposite can be achieved, respectively. Effect of DNA as clay modifier on thermal performance of epoxy nanocomposite containing 2.5%wt d-clay was evaluated using TGA and cone calorimetry analysis, revealing significant decreases of ~4000 kJ/m2 and ~78 kW/m2 in total heat release and peak of heat release rate, respectively, in comparison to that containing 2.5%wt of m-clay.

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One-step amino-functionalization of milled carbon fibre for enhancement of thermo-physical properties of epoxy composites

Cited by 47 publications

References 50 publications

The effect of nanomodified epoxy on the tensile and flexural properties of Napier fiber reinforced composites

The effect of nanomodified epoxy on the tensile and flexural properties of Napier fiber reinforced composites

Enhanced interfacial interaction by grafting carboxylated‐macromolecular chains on nanodiamond surfaces for epoxy‐based thermosets

Fish DNA-modified clays: Towards highly flame retardant polymer nanocomposite with improved interfacial and mechanical performance

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