Cure behavior and thermal stability analysis of multiwalled carbon nanotube/epoxy resin nanocomposites

Abstract

As-received multiwalled carbon nanotubes (MWCNTs) were first treated by a 3 : 1 (v/v) mixture of concentrated H 2 SO 4 /HNO 3 and further functionalized by ethylenediamine/dicyclohexylcarbodiimide/tetrahydrofuran solution. MWCNT/epoxy nanocomposites were prepared. Their cure behaviors were investigated by dynamic differential scanning calorimetry. Quantitative analysis of the activation energy as a function of the degree of curing was carried out by the Flynn-Wall-Ozawa method. The fitted multiple regression equations for values of the activation energy of different systems were obtained. MWCNTs have the retardation effect on the cure reaction of epoxy resin, while the functional groups on the surface of amine-modified MWCNTs could accelerate the cure reactions. Thermal stability was studied by thermogravimetric analysis. The filling of amine-modified MWCNTs is beneficial to lower the cure activation energy and improve thermal stability of the nanocomposite.

Hybrid Nanocomposites Based on Epoxy/silsesquioxanes Matrices Reinforced with Multi-walled Carbon Nanotubes

“…This behavior was also observed in Figure 1b, indicating that a high degree of cure was achieved with the applied cure conditions. Although some reports have shown that CNT may change the cure reaction parameters of epoxy resins [23][24][25] , the FTIR spectra also show that the incorporation of 0.25 wt% MWCNT did not affect the final cure process of the neat or hybrid epoxy matrix. No spectroscopic change was observed with the incorporation of the MWCNT due, probably, to the low concentration of MWCNT presented in the nanocomposite and also because no reaction between MWCNT and epoxy/silsesquioxanes was expected.…”

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

“…This indicates that the hybrid coating does not develop good contact with the smooth copper surface and thus, despite its ~2× higher thermal conductivity vs. the 6 wt.% CBP/rubbery epoxy composite, the hybrid coating was unable to perform much better. It can also be observed 20 from Fig. 7 GNPs are less oriented parallel to interface (i.e., more GNPs are standing perpendicular to the interfacial surfaces) than on the smooth surface and this might result in the higher thermal conductivity of hybrid coating between rough surface.…”

Epoxy resin nanocomposites reinforced with ionized liquid stabilized carbon nanotubes

“…Consequently, H can be regarded as a constant over the whole curing reaction. From a dynamic DSC run, the total area of the exothermal peak (the region between the exotherm and the baseline) is in direct proportion to the molar reaction heat, the H released during the whole cure reaction [34,35]. The extent of the curing at any temperature can be expressed as…”

“…It is known that curing can be monitored by the FTIR technique [34,36]. In this study, the degree of curing of the f-CNT/epoxy nanocomposite was calculated.…”