Microstructural evidence of the toughening mechanisms of polyurethane reinforced with halloysite nanotubes under high strain-rate tensile loading

Aguiar, Rafaela; Miller, Ronald E.; Petel, Oren E.

doi:10.1038/s41598-021-92663-5

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…The polyurea-HNT nanocomposite was considered due to a series of recent studies demonstrating superior mechanical and ballistic performance of polyurethane nanocomposites due to the integration of HNT changing the spherulitic microstructure of the polymer. [16][17][18] There is also evidence of dynamic material property improvements for particle-reinforced polymers at high-strain rates, 19 provided that there is adequate surface wettability of the particles. 20 There were two samples with pure polyurea layers, one which was adhered to the Kevlar substrate, and another that was nonadhered.…”

Section: Kevlar Samplesmentioning

confidence: 99%

Fabric armour erosion using a buried charge ejecta analog

Oddy

Lebar

Aguiar

et al. 2022

Textile Research Journal

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The threat posed by buried explosive charges and their explosive dispersal of environmental debris is associated with a variety of debilitating injuries. The dispersion profile of such threats includes particulate in a broad range of particle length scales, which are more destructive to ballistic fabrics than larger particles alone. Smaller particles are initially dispersed at higher speeds, degrading armour fabrics prior to the arrival of the larger penetrating particulate. In the present work, we present a low-cost industrial abrasion test method to investigate the abrasive wear in neat and polymer-coated ballistic fabrics to determine the level of degradation of the fabrics under the abrasive load. These fabrics were subjected to the impingement of an abrasive jet with average particle velocity of 187 ± 20 m/s. The results showed evidence of significant degradation and failure within the ballistic fabrics, that would certainly influence their subsequent ballistic performance. The addition of polymer coatings was able to reduce the abrasive degradation of the fabrics. The failure modes of the polymer composites are similarly described. This methodology shows promise as a means of armour material screening for this particular threat.

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Section: Kevlar Samplesmentioning

confidence: 99%

Fabric armour erosion using a buried charge ejecta analog

Oddy

Lebar

Aguiar

et al. 2022

Textile Research Journal

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Effect of a Halloysite-polyurethane nanocomposite interlayer on the ballistic performance of laminate transparent armour

Aguiar

Petel

Miller

2022

Composites Part C: Open Access

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Synergies of Nanocopper and Graphene as Cofillers in a Shape-Memory Polyurethane

Vishwakarma,

Jaiswal,

Gupta

et al. 2024

ACS Appl. Polym. Mater.

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Graphene and its related materials are commonly used as reinforcements in shape-memory polymers (SMPs) to engineer their functional properties, but at the cost of a reduction in their failure strain. Here, we demonstrate that the reduced failure strain in multilayer graphene reinforced polyurethane (PU/MGR) composites (at 2.0 wt % MGR) could be enhanced by more than two times with the introduction of copper nanoparticle (CuNP) cofillers (0.1−1.0 wt % CuNP). The CuNPs play a crucial role in disrupting the π−π and van der Waals interactions between the MGR sheets, which serve to reduce their agglomeration and suppress the number of stress−concentration sites. Interestingly, introduction of CuNPs was found to not only increase the failure strain but also contribute to remarkable tribological and thermal properties of the PU/MGR/CuNP composites. CuNP-decorated MGR fillers present at a sliding tribo-interface enabled the easy shearing and rolling of MGR sheets across each other, thereby significantly reducing the friction to attain a state of superlubricity exhibiting an ultralow and stable coefficient of friction of ∼0.05−0.06. These concepts derived from using CuNPs as cofillers in graphene-reinforced PU may be extended to many other SMP systems for various functional systems.

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Microstructural evidence of the toughening mechanisms of polyurethane reinforced with halloysite nanotubes under high strain-rate tensile loading

Cited by 5 publications

References 53 publications

Fabric armour erosion using a buried charge ejecta analog

Fabric armour erosion using a buried charge ejecta analog

Effect of a Halloysite-polyurethane nanocomposite interlayer on the ballistic performance of laminate transparent armour

Synergies of Nanocopper and Graphene as Cofillers in a Shape-Memory Polyurethane

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