Effect of functionalized process and CNTs aggregation on fracture mechanism and mechanical properties of polymer nanocomposite

Esbati, Amir Hossein; Irani, Saied

doi:10.1016/j.mechmat.2018.01.001

Cited by 55 publications

(29 citation statements)

References 48 publications

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“…The main difficulty for creating the conductive nanocomposites with a low CNT content is the poor distribution of CNT, due to the tendency of nanotubes to form bundles in which nanotubes stick together with each other due to the van der Waals interaction [32]. The nanotubes combined into bundles do not participate in the percolation chains, which increases the percolation threshold.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Zare

Rhee

2020

Polymers

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The interphase layer surrounding nanoparticles can reflect the tunneling effect as the main mechanism of charge transferring in polymer/carbon nanotube (CNT) nanocomposites (PCNT). In this paper, the percolation threshold, effective volume fraction of CNT, and the portion of percolated filler after percolation are expressed by interphase and CNT waviness. Moreover, the developed terms are used to suggest the influences of CNT dimensions, interphase thickness, and waviness on the electrical conductivity of PCNT by conventional and developed models. Thin and long CNT, thick interphase, and low waviness obtain a high fraction of percolated CNT. However, the highest level of effective filler fraction is only calculated by the thinnest CNT and the thickest interphase. Furthermore, both models show that the thinnest and the longest CNT as well as the thickest interphase and the least CNT waviness cause the highest conductivity in PCNT, because they positively contribute to the formation and properties of the conductive network.

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Section: Introductionmentioning

confidence: 99%

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Zare

Rhee

2020

Polymers

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“…Owing to their fascinating properties, CNTs and graphene have great potentials to be applied as reinforcements to promote the mechanical, thermal, and electrical performance of polymer matrix. However, the natures of carbon nanoparticles make it incompatible with organic polymer matrix, which leads to poor interfacial adhesion and lowers their effectiveness as fillers for property improvements …”

Section: Introductionmentioning

confidence: 99%

Construction of electrostatic and π–π interaction to enhance interfacial adhesion between carbon nanoparticles and polymer matrix

Zhao

Jiao

2019

J of Applied Polymer Sci

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In this study, an efficient method by constructing electrostatic and π-π interaction to enhance interfacial adhesion of nanocomposites was contrived. As commercial products and commonly used reinforcements, carbon nanotubes (CNTs) and graphene oxide (GO) were selected as fillers. Two kinds of interactions between carbon nanoparticles and polymer matrix were constructed by adding auxiliary comonomers (ACMs) into nanocomposites, in which one was the electrostatic interaction between quaternary ammonium cationic groups on ACMs as well as oxygen-containing groups of carbon nanoparticles, while the other was the π-π interaction between benzene rings on ACMs and conjugated structure on nanoparticles. Poly(methyl methacrylate) (PMMA) was chosen as a polymer matrix. It was found that carbon nanoparticles dramatically improved properties of nanocomposites, including thermal and mechanical performances due to the construction of electrostatic and π-π interaction on the interface. Compared with PMMA, the tensile strength of CNTs and GO reinforced nanocomposites was improved by 43.1 and 57.5%, respectively. The thermal decomposition temperature of CNTs and GO reinforced nanocomposites was improved by 21 and 23 C, respectively. Interesting and convincing results proved that the construction of multiple interactions can provide a promising method to effectively enhance interfacial adhesion of nanocomposites.

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“…It is worth mentioning that achieving the optimal properties of nanocomposites is strongly related to the uniform distribution of nanoparticles and the formation of proper interfaces between CNTs and matrix . Otherwise, the properties of nanocomposite decrease in comparison to those of pure resin due to the presence of nanoparticles agglomerations . Generally, the properties of nanocomposites are influenced by various factors as follows: Different methods of manufacturing or functionalizing CNTs may cause different levels of damage to nanoparticles which affect the ultimate properties of nanocomposites …”

Section: Introductionmentioning

confidence: 99%

“…5 Otherwise, the properties of nanocomposite decrease in comparison to those of pure resin due to the presence of nanoparticles agglomerations. 6,7 Generally, the properties of nanocomposites are influenced by various factors as follows:…”

Section: Introductionmentioning

confidence: 99%

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

Karami

Ayatollahi

Saboori

2020

Fatigue Fract Eng Mat Struct

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For the first time, the brittle fracture of epoxy‐based nanocomposite reinforced with MWCNTs (multi‐walled carbon nanotubes) and subjected to mixed mode II/III loading conditions is investigated. This experimental investigation is carried out using a newly developed test configuration. Araldite LY 5052 epoxy, which is a resin frequently used in aerospace industry, is utilized to fabricate pure epoxy and nanocomposite test specimens with two different MWCNTs contents of 0.1 and 0.5 wt%. The obtained experimental results reveal that adding MWCNTs to epoxy resin up to 0.5 wt% improves the fracture toughness under pure mode II and pure mode III loading with an increasing trend. This is while the improvement under mixed mode II/III loading is reduced by adding nanotubes more than 0.1 wt%. To justify the variations of fracture toughness in terms of nanoparticles content, SEM (scanning electron microscopy) photographs of the fracture surfaces of the specimens in the vicinity of the initial crack front are prepared. Additional fracture mechanisms caused by adding carbon nanotubes are discussed in detail based on the provided SEM images.

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Effect of functionalized process and CNTs aggregation on fracture mechanism and mechanical properties of polymer nanocomposite

Cited by 55 publications

References 48 publications

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Construction of electrostatic and π–π interaction to enhance interfacial adhesion between carbon nanoparticles and polymer matrix

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

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