Abstract
Multi-walled carbon nanotubes (MWNTs) were incorporated into a linear low-density polyethylene (LLDPE) matrix through using screw extrusion and injection technique. The effect of different weight percent loadings of MWNTs on the morphology, mechanical, and thermal of LLDPE/MWNTs nanocomposite had been investigated. It was found that, at low concentration of MWNTs, it could uniformly disperse into a linear low-density polyethylene matrix and provide LLDPE/MWNTs nanocomposites much improved mechanical properties. Thermal analysis showed that a clear improvement of thermal stability for LLDPE/MWNTs nanocomposites increased with increasing MWNTs content.
Highlights
It is found that some Multi-walled carbon nanotubes (MWNTs) are broken apart, and, as a result of poor interfacial adhesion, some MWNTs are pulled out of the matrix before the breakage, forming caves on the fractured surface; other MWNTs are observed with their one end still strongly embedded in the linear low-density polyethylene (LLDPE) matrix as an inset
It is clear that incorporation of MWNTs initially has a negative effect on the elongation at the break point and a greater decrease reaches up to 53% compared to neat LLDPE; as MWNTs concentrations is more than 1 wt. (%), the elongation at the break increases with increasing MWNTs amounts
Izod impact strength of notched specimen and the tensile strength initially increased with the increasing MWNTs content, and subsequently decrease with increasing MWNTs content
Summary
I.e. polymer formed with nano-sized fillers, display superior properties at lower loading than conventional composites and have attracted more and more attention because of their many advantages such as flexible features, easy processing, and lightweight[1,2,3,4,5,6,7,8,9,10,11], especially polymers/carbon nanotubes (CNTs) nanocomposites[12,13,14,15]. It is well known that CNTs can exist in the form of single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). They can both be synthesized by three techniques: laser ablation, arc discharge and chemical vapour decomposition (CVD)[20]. CVD is the most commonly used method for mass production of different types of CNTs. SWNTs offer the opportunity for much lower loading versus MWNTs to achieve the same electrical properties, enhancing mechanical properties even further[21], MWNTs are extensively used, due to lower unit cost, greater availability and fewer dispersion challenges compared with SWNTs. Linear low density polyethylene (LLDPE) is a commodity polymer, cheap, versatile, with widely uses in a variety of forms.
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