Properties and characterization of ethylene-vinyl acetate filled with carbon nanotube

Abstract

Ethylene-vinyl acetate (EVA) containing carbon nanotubes (CNTs) were prepared by melt blending. Morphological observation showed well dispersion of CNTs in EVA. Effect of CNTs on crystallization of EVA was studied by differential scanning calorimetry (DSC). The beginning and maximum crystallization temperatures for CNT/EVA composite resulted 10 and 5°C higher than pure EVA, respectively, showing high nucleation capability of CNTs in EVA matrix. The morphologies were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM), whereas, flammability properties were assessed by thermogravimetric analysis (TGA), natural burning and cone calorimetry. It was resulted that when nanodimensional material was not well dispersed, degradation products were not changed significantly. Unlike, CNT/EVA nanocomposites gave reasonably good reductions in peak heat release even when well nano-dispersed has not been obtained due to formation of low permeable char containing graphitic carbon. It was noticeable that CNT addition to EVA reduced surface cracks of chars which improved barrier resistance to evolution of flammable volatiles and oxygen access to condensed phase. The CNTs declined heat release rates and mass loss rate by 50-60 %, prolonged combustion time to two times in CNT/EVA samples. The TGA data also displayed that CNTs increased thermal degradation temperatures and final & Maziyar Sabet charred residues of CNT/EVA samples. The experimental observations from the torque, morphological evolution tests, and SEM resulted that CNTs are utilized for (1) increase of melt viscosity due to network structure formation of CNTs in the EVA matrix; (2) the enhancement of thermoxidation stability as a result of the CNTs' mechanical strength and integrity of the charred layers in the CNT/EVA nanocomposites; (3) the formation of compact charred layers promoted by CNTs acted as heat barrier and thermal insulation.

Ethylene vinyl acetate nanocomposites with hybrid silicate nanofillers of destabilized natural and commercial bentonites and organomontmorillonites

“…Specifically, the diffraction peaks of the NB, CB, and OMMT appear at 2 θ = 5.7°, 6.2°, and 3.5°, which correspond to the basal spacing (d 001 ) of 1.59, 1.47, and 2.51 nm, respectively. As expected, the diffraction pattern of the neat EVA does not show any crystalline peak at 2 θ range from 1 to 10° . Therefore, the peak (if presence) appearing in the nanocomposite samples represents the basal spacing of the nanoclay filler.…”

Comparing Multi-Walled Carbon Nanotubes and Halloysite Nanotubes as Reinforcements in EVA Nanocomposites

“…Moreover, the addition of HNTs to EVA could enhance water resistance and oxygen permeability [ 40 ]. Various CNTs containing EVA-based nanocomposites had also been reported [ 41 , 42 , 43 , 44 , 45 ]. The mass production of high quality CNTs at lower cost and their exceptional electrical, thermal, and mechanical properties, make it one of the most attractive nanofillers.…”

Inclusion of graphene on LDPE properties

“…In addition, each graphene layer has some inconsistent characteristics as its molecular structure is not penetrable and it can be implemented as protective shields against electromagnetic waves for small particles comparable to H 2 or noble gasses. Graphene's mechanical characteristics are also remarkable as its great Young module is approximately 1 TPa [33]. Graphene nanocompounds have a wonderful deterrent to oxygen penetration due to very tiny holes available in the surface of graphene.…”