Effect of APTMS modification on multiwall carbon nanotube reinforced epoxy nanocomposites

Mishra, Kunal; Singh, Raman P.

doi:10.1016/j.compositesb.2018.12.134

Cited by 45 publications

(25 citation statements)

References 17 publications

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“…The matrix PA11 exhibited two main relaxation peaks, demarcated at decreasing temperatures as α and β relaxations, defined as Tg and sub‐Tg transitions, and associated with the material's properties in the glassy state 52 . At higher temperatures, the relaxation of PA11 observed at around 18°C corresponds to the temperature at which the mobility of the main chain segments occurs in the amorphous regions of the polymer; therefore, it is directly related to the glass transition temperature, Tg 53 . It was found that β relaxation for PA11 occurred at approximately −70°C, which can be attributed to the localized movement of the chain segments, including the amide groups that are not involved in hydrogen bonding 54,55 …”

Section: Resultsmentioning

confidence: 99%

Influence of the addition of multi‐walled carbon nanotubes on the thermal and mechanical properties of polyamide‐11 before and after aging tests

Cruz

Tienne

Gondim

et al. 2020

J of Applied Polymer Sci

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In this work, the preparation and characterization of nanocomposites of commercial polyamide‐11 reinforced with multi‐walled carbon nanotubes (MWCNT), untreated, oxidized or with the modified surface through silanization with 3‐aminopropyl trimethoxy silane (APTMS), in concentrations of 0.1%, 0.5%, and 1.0 wt% in the polymer matrix was investigated. The processing of the nanocomposites was carried out via mixing in the molten state in a twin‐screw mini‐extruder at 200°C under 60 rpm screw rotation speed, with a residence time of 7 min. The addition of the MWCNT increased the thermal stability of PA11, predominantly with 0.5% of silanized nanotubes, as observed by the thermogravimetric analysis. X‐ray diffraction and differential scanning calorimetry analyses indicated that the degree of crystallinity of the formulations increased with the nanofiller content. On the other hand, the use of the highest concentration generated agglomerates, suggesting less dispersion in the matrix and, consequently, a reduction in crystallinity. Dynamic mechanical thermal analysis showed that the silanization process promoted an increase in both loss and storage moduli. All produced nanocomposites obtained values of corrected inherent viscosity above 1.20 dl/g, before and after the aging test. The use of lower load levels promoted better processability due to the lubricating effect of the nanotubes and an increase in the hydrophobic character of the samples, as observed by the increase of the contact angle.

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Section: Resultsmentioning

confidence: 99%

Influence of the addition of multi‐walled carbon nanotubes on the thermal and mechanical properties of polyamide‐11 before and after aging tests

Cruz

Tienne

Gondim

et al. 2020

J of Applied Polymer Sci

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“…For the cyclic exposure of UV condensation, the results show an unexpected increase in flexural strength. The possible explanation for this could be an increase in the cross-linking density in the epoxy matrix due to the high temperature in the degradation chamber [34,35]. UV degradation are surface phenomena and due to the thicker carpet composite sample the 1000 h exposure time is not enough to significantly change the mechanical properties as a result of degradation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The Influence of Nanoclay on the Flame Retardancy and Mechanical Performance of Recycled Carpet Composites

Mishra

Vaidyanathan

2019

Recycling

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In the present study, we recycled waste carpet using a vacuum-assisted resin transfer molding (VARTM) process. Three different variations of carpet composites were fabricated, namely, neat epoxy, clay-coated, and clay-infused carpet composites. The carpet composite samples were degraded hygrothermally as well as under a cyclic UV condensation condition. Presence of clay was shown to impede the moisture absorption and UV degradation in the carpet composites. Flexural properties also showed that the presence of clay slows the degradation process of the composites. The flame retardancy result indicated that the presence of clay in the polymer network decreases the ignition time of the carpet composites.

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“…Although there are different methods to reach a better dispersion of CNTs in the rubber matrices [ 19 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ], the surface modification of the CNT is one of the most widely-used approaches to increase the surface reactivity of these nanoparticles and improve their interaction with the polymer matrices [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. The introduction of appropriate functional groups into the surface of the particles could lead to a better interaction of the filler with the matrix and therefore to an improvement in the final properties of the rubber nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Modified Carbon Nanotubes for the Development of Advanced Elastomeric Materials

et al. 2021

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The outstanding properties of carbon nanotubes (CNTs) present some limitations when introduced into rubber matrices, especially when these nano-particles are applied in high-performance tire tread compounds. Their tendency to agglomerate into bundles due to van der Waals interactions, the strong influence of CNT on the vulcanization process, and the adsorptive nature of filler–rubber interactions contribute to increase the energy dissipation phenomena on rubber–CNT compounds. Consequently, their expected performance in terms of rolling resistance is limited. To overcome these three important issues, the CNT have been surface-modified with oxygen-bearing groups and sulfur, resulting in an improvement in the key properties of these rubber compounds for their use in tire tread applications. A deep characterization of these new materials using functionalized CNT as filler was carried out by using a combination of mechanical, equilibrium swelling and low-field NMR experiments. The outcome of this research revealed that the formation of covalent bonds between the rubber matrix and the nano-particles by the introduction of sulfur at the CNT surface has positive effects on the viscoelastic behavior and the network structure of the rubber compounds, by a decrease of both the loss factor at 60 °C (rolling resistance) and the non-elastic defects, while increasing the crosslink density of the new compounds.

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Effect of APTMS modification on multiwall carbon nanotube reinforced epoxy nanocomposites

Cited by 45 publications

References 17 publications

Influence of the addition of multi‐walled carbon nanotubes on the thermal and mechanical properties of polyamide‐11 before and after aging tests

Influence of the addition of multi‐walled carbon nanotubes on the thermal and mechanical properties of polyamide‐11 before and after aging tests

The Influence of Nanoclay on the Flame Retardancy and Mechanical Performance of Recycled Carpet Composites

Sulfur-Modified Carbon Nanotubes for the Development of Advanced Elastomeric Materials

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