Dolgu maddesi tipi ve morfolojisinin termoplastik nanokompozitlere etkileri: Isıl, elektriksel ve mekanik özellikler

In recent years, polymer nanocomposites reinforced by carbon-based nanofillers, especially multiwall carbon nanotubes (MWCNTs) and graphene nanoplatelets (GnPs), have received increasing attention due to their potentials as tailored materials with improved properties. Many studies have been reported that these nanocomposites exhibit better enhancement in thermal, electrical, and mechanical properties compared the nanocomposites with other filler materials. However, the dispersion of carbon-based nanofillers within the polymers is the bottleneck impeding their applications and the performance of the nanocomposites including them. The incorporation of hybrid nanofillers into polymer matrix is the easiest method to overcome this problem. The main objective of this thesis is to investigate the effects of synergic, weight ratio and size of carbon-based nanofillers on the thermal, electrical, and mechanical properties. For this purpose, two different dimensions of MWCNTs and three different dimensions of GnPs were used to investigate the size effect on the high-density polyethylene (HDPE)-based nanocomposites properties. All samples were prepared by using melt mixing, followed by compression molding. To better understand size and synergic effects, first, the size effect of carbon-based nanofillers on the properties of nanocomposites including MWCNTs or GNPs alone were investigated. Then, MWCNTs and GnPs exhibiting the best performance were simultaneously added into the matrix to investigate the synergic effect between nanofillers. Finally, these properties of the hybrid nanocomposites including GnPs and CNTs with different sizes were investigated experimentally to determine optimum filler weight ratio and size which maximally enhance certain properties.