Funct. Mater. 2020; 27 4: 774-780.
Influence of nanodiamonds on the structure and thermophysical properties of polyethylene glycol-based systems
P.Mohyla Black Sea National University, 10, 68 Desantnykiv Str., 54003 Mykolaiv, Ukraine
The structure features and properties of nanocomposites based on polyethylene glycol (PEG) and nanodiamonds were investigated using the methods of X-ray diffraction, differential scanning calorimetry and optical microscopy. Systems based on crystalline PEG and detonation synthesized nanodiamonds were prepared by ultrasonic dispersion in melt. It has been shown that the structure and properties of PEG-based nanocomposites are significantly dependent on the content of the nanofillers. It was found that in the concentration range of 1-1.5 % nanofiller in the system, structural and thermophysical characteristics, such as crystallinity, effective crystallite size and melting temperature, exhibit extreme behavior. At these concentrations, the particles of nanodiamonds have the largest surface of polymer-filler interaction. The concentration dependence of the thermal conductivity coefficient exhibits percolation-like behavior. This effect is observed when the content of nanodiamonds is 1 % and is confirmed by optical microscopy data. The phenomenon of a step-like increase in thermal conductivity is explained by the formation of a structural network of filler particles in the PEG matrix.
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