Polyethylene is since its mechanical and chemical properties one of the most common used polymer materials additionally as matrix composite material. In combination with carbon nanotubes, thus hold extraordinary characteristics, they form revolutionary nanocomposites that are possible of application into the most demanding fields of nowadays' science. Within the framework of the thesis, we discussed the influence of the carbon nanotube networking on mechanical properties, where we determined the elastic modulus, hardness, and surface properties, such as roughness and resistance to scratch, using a nanoindenter. The tests were performed on low- and high-density polyethylene samples with different mass frictions of single-walled carbon nanotubes. The results showed that the network (geometric entangling of nanotubes) is formed at ~0.7% and is the main factor in strengthening or improving the mechanical properties of nanocomposites. In the case of LDPE nanocomposites, the elastic modulus improves by 250% and the hardness by 225% , while in the case of HDPE nanocomposites, the mentioned properties improve by 122% and 130%. It was also found that the roughness increases by 100 nm with the addition of nanofillers in both LDPE and HDPE nanocomposites.
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