Fractography analysis of 1.0 wt% nanoclay/multi-layer graphene reinforced epoxy nanocomposites

Atif, Rasheed

doi:10.1177/0021998316679017

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…The KIC values are a function of nano clay loading and are modestly higher than that of the neat epoxy (Figure 3). This agrees well with the results reported in the literature [7,24,26,27,[29][30][31][32][33]. The fracture toughness of the neat epoxy is 0.8MPam0.5.…”

Section: Resultssupporting

confidence: 92%

Modeling Sources of Fracture Toughness for an Intercalated Nanoclay/Epoxy

Marouf

2020

PSPRJ

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The novelty of this paper is to quantify the contribution of micro mechanisms caused the changes in fracture behavior of a model system epoxy resin by introduction of intercalated nano clay. To achieve this aim, a combination of fracture toughness measurements, electron and optical microscopy assessments and analytical models have been used. The results obtained indicated that addition of intercalated nano clay increased fracture toughness of the epoxy resin, although the increases in toughness were modest. Examination of fracture surfaces and subsurface damage revealed the presence of crack deflection, particle bridging and crack branching/microcracking mechanisms. Analysis of the micromechanical models for these toughening mechanisms suggested that crack branching contributes the most to the increase in toughness. In addition in the present study, the possible additive effects of crack path deflection, crack wake bridging, and crack branching and microcracking have been observed as the sources of modest improvements in toughness for these intercalated clay-filled epoxies.

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Section: Resultssupporting

confidence: 92%

Modeling Sources of Fracture Toughness for an Intercalated Nanoclay/Epoxy

Marouf

2020

PSPRJ

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“…They also have been used as nanoreactors and adsorbents [23]. The mechanical properties of systems with halloysite nanoclay are not the only improvements that can be observed [24][25][26]. The incorporation of halloysite nanoclay enhanced the nanocomposites' thermal stability and flame and corrosion resistance of composites as well [27].…”

Section: Introductionmentioning

confidence: 99%

The Degradation of Mechanical Properties in Halloysite Nanoclay-Polyester Nanocomposites Exposed in Seawater Environment

Saharudin

Wei

Shyha

2016

Journal of Nanomaterials

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Polyester based polymers are extensively used in aggressive marine environments; however, inadequate data is available on the effects of the seawater on the polyester based nanocomposites mechanical properties. This paper reports the effect of seawater absorption on the mechanical properties degradation of halloysite nanoclay-polyester nanocomposites. Results confirmed that the addition of halloysite nanoclay into polyester matrix was found to increase seawater uptake and reduce mechanical properties compared to monolithic polyester. The maximum decreases in microhardness, tensile and flexural properties, and impact toughness were observed in case of 1 wt% nanoclay. The microhardness decreased from 107 HV to 41.7 HV (61% decrease). Young’s modulus decreased from 0.6 GPa to 0.4 GPa (33% decrease). The flexural modulus decreased from 0.6 GPa to 0.34 GPa (43% decrease). The impact toughness dropped from 0.71 kJ/m2to 0.48 kJ/m2(32% decrease). Interestingly, the fracture toughnessKICincreased with the addition of halloysite nanoclay due to the plasticization effect of the resin matrix. SEM images revealed the significant reduction in mechanical properties in case of 1 wt% reinforcement which is attributed to the degradation of the nanoclay-matrix interface influenced by seawater absorption and agglomeration of halloysite nanoclay.

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“…In contrast, samples reinforced with halloysite nanoclay showed less softening effect caused by methanol exposure. For higher microhardness values, the indenter hits perfectly on halloysite nanoclay tubes and the nano-filler can provide excellent resistant toward indentation because of its high surface ratio [35]. Previous research also revealed that methanol could have the highest diffusion rate and greatest degree of swelling on monolithic polyester [48].…”

Section: Resultsmentioning

confidence: 99%

“…After the images were captured and saved in the computer, the crack length that retains a spot of light focused at the sample surface [35]. An electric motor controls the upright movement and interacts to the sample surface [36] [37].…”

Section: -56-1:)mentioning

confidence: 99%

Environmental Stress Cracking Resistance of Halloysite Nanoclay-Polyester Nanocomposites

Saharudin¹,

Wei²,

Shyha³

2017

WJET

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The environmental stress cracking resistance of halloysite nanoclay-polyester nanocomposites was investigated using fracture mechanics approach. The incorporation of halloysite nanoclay was found to improve the environmental stress cracking resistance of the nano-composites. The storage modulus of nano-composites measured by dynamic mechanical analysis increased remarkably as a function of halloysite nanoclay content. At 0.7 wt% nanoclay, the T g improved from 72˚C to 76˚C. The fracture toughness increased up to 33% and time to failure improved 155% with the addition of 0.7 wt% of halloysite nanoclay. The maximum microhardness was found 119% higher for the same nano-filler concentration compared to monolithic polyester. The reinforcement with 1 wt% showed lower fracture toughness due to agglomerations of nanoclay which act as flaws. The presence of agglomerates weakened the bond between nano-particles and matrix hence reduces the environmental stress cracking resistance by halloysite nanoclay reinforcement.

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Fractography analysis of 1.0 wt% nanoclay/multi-layer graphene reinforced epoxy nanocomposites

Cited by 5 publications

References 22 publications

Modeling Sources of Fracture Toughness for an Intercalated Nanoclay/Epoxy

Modeling Sources of Fracture Toughness for an Intercalated Nanoclay/Epoxy

The Degradation of Mechanical Properties in Halloysite Nanoclay-Polyester Nanocomposites Exposed in Seawater Environment

Environmental Stress Cracking Resistance of Halloysite Nanoclay-Polyester Nanocomposites

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