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Key Role of the Dispersion of carbon nanotubes (CNTs) within Epoxy Networks on their ability to Release

Abstract : Carbon nanotubes (CNT) reinforced nanocomposites represent an unique opportunity in terms of designing advanced materials with mechanical reinforcement and electrical and thermal conductivities improvements. However, toxic effects of these composites on human health still have been studied and very soonly some regulations on CNT and on composites based on CNT will be enacted. That is why CNT releasing during nanocomposites lifecycle must be controlled. As the releasing depends on the interfacial strength that is stronger between CNT and polymer compared to CNTs in a CNTs agglomerate, two dispersion states, one poorly dispersed versus another well dispersed are generated and finely described. So the main aim of this study is to check if CNT dispersion state has an influence on the CNT potential releasing in the nanocomposite. To well tailor and characterize the CNT dispersion state in the polymer matrix, the electronic microscopies (SEM and TEM) but also the rheological analysis are carried out to well identify if CNTs are isolated, in bundles or in agglomerates. When the dispersion state is known and controlled, its influence on the polymerization kinetic and on mechanical properties is discussed. It appears clearly that in the case of good dispersion state, strong interfaces are generated linking the isolated nanotubes with the polymer whereas the CNT cohesion in an agglomerate seems much more weak and it does not provide any improvement to the polymer matrix. Raman spectroscopy is relevant to analyze the interfacial properties and allows the relationship with the releasing ability of nanocomposites, i.e. CNTs poorly dispersed in the matrix are more readily released when compared to well dispersed nanocomposites. The tribological tests confirm from released particles granulometry and observations that a CNT dispersion state sufficiently achieved in the nanocomposite avoids single CNT releasing under those solicitations.
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https://hal.archives-ouvertes.fr/hal-03181269
Contributor : Jannick Duchet-Rumeau <>
Submitted on : Thursday, March 25, 2021 - 2:58:05 PM
Last modification on : Sunday, March 28, 2021 - 3:16:50 AM
Long-term archiving on: : Saturday, June 26, 2021 - 6:58:07 PM

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  • HAL Id : hal-03181269, version 1

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Jannick Duchet-Rumeau, Maxime Pras, Jean-François Gérard, Luana Golanski, Guilhem Quintard, et al.. Key Role of the Dispersion of carbon nanotubes (CNTs) within Epoxy Networks on their ability to Release. Polymers, MDPI, 2020. ⟨hal-03181269⟩

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