Nanocomposites and nanomaterials

Electrical conductivity and percolation characteristics of hybrid polymer composites with different ratios of nanocarbon fillers
Syvolozhskyi O.A.1, Perets Yu.S.1, Vovchenko L.L.1, Matzui L. Yu.1
1 Department of Physics, Kyiv National Taras Shevchenko University, Volodymyrs’ka str., 64, Kyiv, 01033, Ukraine. 
E-mail: mail.olexiy@gmail.com

In polymer composites, a symbiotic phenomenon due to the combination of different fillers, which is also known as the synergistic effect, can greatly enhance electrical conductivity. Multiple fillers can be used to integrate the advantages of all fillers in a single composite [1-2]. Selection and pairing of fillers can be critical to achieving electrical conduction with enhanced performance. Various studies have revealed that polymer composites incorporated with hybrid fillers perform better than those with single fillers. 
The scientific paper is devoted to the study of concentration dependences of elecrtical conductivity with random distribution of mono or hybrid filler in low viscosity resin Larit285. Mono filler - graphite nanoplates or carbon nanotubes, hybrid filler - combination in different ratios of graphite nanoplates and carbon nanotubes (1:1, 3:1). 
Concentration dependences of thermal conductivity have shown that carbon nanotubes are more effective filler for increasing electrical conductivity. Concentration curves for different ratios of the hybrid nano carbon filler in the composite have their own peculiarities, namely a different percolation transition, both static and dynamic, different lengths and shelf height after the achievement of dynamic percolation transition. This may be due to the different formation of the conductive chain in the hybrid composite. As the contents of graphite nanoplates increase in the hybrid composite, the size of the dynamic percolation threshold increases. The synergistic effect for hybrid composites is observed above the threshold of percolation. 

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