Multiwalled carbon nanotubes impregnated rubber nanocomposites: thermal transport/decomposition and differential scanning calorimetric study

Abstract

In order to analyze the effect of multiwalled carbon nanotubes on the thermal transport/stability characteristics of styrene butadiene rubber, five diverse loadings of multiwalled carbon nanotubes were impregnated in the rubber matrix using dispersion kneader and two roller mixing mill. Thermal conductivity and thermal impedance of the nanocomposite specimens were evaluated according to ASTM E1225-99 and D5470-03. It was observed that the thermal conductivity was reduced up to 79% while thermal impedance of the polymer nanocomposite was improved up to 390% at 523 K with 1 wt% impregnation of nanotubes into the base composite formulation. Thermal stability of the polymer nanocomposite was augmented up to 6%, with the utmost incorporation of the nanotubes. Glass transition and crystallization temperatures were diminished, while the onset and peak melting temperatures were increased with increasing filler to matrix ratio. The percent crystallinity of the nanocomposites has been augmented up to 5%, with 1 wt% incorporation of multiwalled carbon nanotubes into the host matrix. Scanning electron microscopy along with energy dispersive X-ray spectroscopy was used to examine the multiwalled carbon nanotubes dispersion in the rubber matrix, for surface analysis of the post-thermally tested composite specimens and for their compositional analysis.

Development of SWCNTs-reinforced EPDM/SBR matrices for shock absorbing applications

“…Peak melting temperature increases with increasing SWCNTs content in the polymer matrix. This finding demonstrates enhancement of the blend's thermal stability, as shown in the TGA thermograms [34,35].…”

Tailoring in thermomechanical properties of ethylene propylene diene monomer elastomer with silane functionalized multiwalled carbon nanotubes

“…T m1 and T m2 respectively, are enhanced up to 58.28 and 11.21°C, respectively because nanotubes have offered much resistance to the matrix molecular chain mobility by entrapping phonons within the filler's network. Another major reason of the melting temperature enhancement is the higher thermal stability of incorporated S‐MWCNTs compared to carbon black …”

“…Another major reason of the melting temperature enhancement is the higher thermal stability of incorporated S-MWCNTs compared to carbon black. 32,33 Glass transition and crystallization are exothermic phenomena, but melting of the polymer composite is an endothermic phenomenon which means that the nanotubes impregnation in the carbon-filled EPDM composite enhances the endothermic behavior of the composite specimens. Specific enthalpies of the nanocomposite specimens are depicted in Table III.…”

Exfoliated Sodium Montmorillonite Reinforced Elastomeric Nanocomposites: Ablation, Thermal Transport/Decomposition/Transitions and Mechanical Aspects)

“…Time-temperature curves of six thermocouples were observed on the laptop through 6 point data-logger. λ N of the Na-MMT/NBR nanocomposite specimens was measured using Equation 8 [27], [28]. International Journal of Materials, Mechanics and Manufacturing, Vol.…”