Microstructure and properties of polymeric composite materials based on polyethylene and thermally extended graphite for transport systems


  • E.A. Lysenkov, L.P. Klymenko




high-density polyethylene, percolation, polymer composite material, thermoexpanded graphite.


The effect of thermoexpanded graphite (TEG) on the microstructure and functional properties of polymer composites based on high-density polyethylene (HDPE) has been studied by optical microscopy, differential scanning calorimetry and mechanical analysis. There has been proven the efficiency of the method of mixing polymer composites using a piston extruder, which provides a more uniform distribution of the filler in the polymer matrix. It is shown that the introduction of TEG leads to a decrease in the degree of crystallinity and melting point of systems based on high-density polyethylene, which is a consequence of the destruction or increase in the defect of the crystal structure of the polymer matrix under the influence of TEG. With the introduction of 1 % of TEG, the melting point decreased from 415.0 to 408.5 K. With the introduction of 3 % of TEG, the thermal conductivity increased from 0.18 W/(m·K) (for HDPE) to 0.76 W/(m·K). The extreme change in the thermal conductivity of polymer composites is a consequence of the formation of TEG in the polymer matrix of the percolation cluster, the mesh of the filler, which penetrates the entire volume of the material. As a result of the conductivity studies, the percolation threshold of thermal conductivity has been determined for these HDPE-TEG systems, which is 0.6 %. Microscopic studies confirmed the formation of the percolation cluster obtained by thermal conductivity. It is shown that at the content of 0.6 % of TEG, there is formed a continuous cluster. The formation of this cluster is confirmed by mechanical studies. An increase in mechanical strength has been recorded, which increases from 30.5 MPa (for HDPE) to 42.8 MPa at 5 % filler content, and this is promising for the use of these materials in transport systems.


Download data is not yet available.


Hsissou, R et.al. 2021, ‘Polymer composite materials: A comprehensive review’, Composite Structures. vol. 262, Article 113640.

Kumar, VV et.al. 2019, ‘A Review of Recent Advances in Nanoengineered Polymer Composites’, Polymers, 11(4):644. [3] Gantayat, S et.al. 2015, ‘Expanded graphite as a filler for epoxy matrix composites to improve their thermal, mechanical and electrical properties’, New Carbon Materials, 30(5): 432–437. doi: 10.1016/S1872-5805(15)60200-1 [4] Tang, YJ, Lin, YX, Jia, YT & Fang, GY 2017, ‘Improved thermal properties of stearyl alcohol/high density polyethylene/expanded graphite composite phase change materials for building thermal energy storage’, Energy and Buildings, 153: 41–49. [5] Mochane, MJ & Luyt, AS 2015, ‘The effect of expanded graphite on the flammability and thermal conductivity properties of phase change material based on PP/wax blends’, Polymer Bulletin, vol. 72, pp. 2263–2283. [6] Tavman, I et.al. 2011, ‘Measurement of heat capacity and thermal conductivity of HDPE/expanded graphite nanocomposites by differential scanning calorimetry’, Archives of Materials Science and Engineering, vol. 50, no. 1. pp. 56–60. [7] Sobolciak, P et.al. 2020, ‘Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior’, Polymers, vol. 12, no. 12, p. 2863. [8] Sementsov, YuI, Revo, SL & Ivanenko, KO 2016, ‘Thermoexpanded graphite’, the acad. of the NAS of Ukraine M.T. Kartel, Chuiko Institute of Surface Chemistry of NAS of Ukraine; Taras Shevchenko National University of Kyiv, p. 241. [in Ukrainian] [9] Dinzhos, RV, Fialko, NM Lysenkov, EA 2014,

Analysis of the Thermal Condu ctivity of Polymer

Nanocomposites Filled with Carbon Nanotubes and Carbon

Black J. of Nano Electron. Phys .., vol 6, no 1 , p . 01015.

Bershtein, VA & Egorov, VM 1990, Differential scanning calorimetry in the physicochemistry of polymers, Chemistry, Leningrad, 256 p. [in Russian]

Mirabella FM Bafna A 2002, Determination of the crystallinity of polyethylene/α-olefin copolymers by thermal analysis: Relationship of the heat of fusion of 100 % polyethylene crystal and the density’, Polymer Physics, vol. 40, no. 15. pp. 1637 1643.

Lysenkov EA Klepko, VV 2015, Characteristic Features of the Thermophysical Properties of a System Based on Polyethylene Oxide and Carbon Nanotubes’, Journal of

Engineering Physics and Thermophysics vol. 88, pp. 1008–1014.

Xu Y, Ray G Abdel Magid B 2 006, Thermal

behavior of single walled carbon nanotube polymer matrix

composites Composites Part A: Applied Science and Manufacturing, vol. 37, no 1, pp. 114 121.

Garkusha, OM etc. 2011, ‘Structural features and properties of polymeric nanocomposites at low concentrations of filler’, Chemistry, physics and surface technology, vol. 1, no. 1, pp. 103–110. [in Ukrainian]

Stauffer D Aharony A 1994, Introduction to

percolation theory Taylor and Francis, London 272 р.

Kim B W, Park S H, Kapadia RS Bandaru PR

, ‘ Evidence of percolation related power law behavior in

the thermal conductivity of nanotube/polymer composites

Applied Physics Letters, 102, 243105; doi: 10.1063/1.4811497. View online: http://dx.doi.org/10.1063/1.4811497

Hadzreel, MRAM & Aisha, ISR 2013, ‘Effect of Reinforcement Alignment on the Properties of Polymer Matrix Composite’, Journal of Mechanical Engineering and Sciences, vol. 4, pp. 548–554.

Wang, Q et. al. 2012, ‘A review on application of carbonaceous materials and carbon matrix composites for heat exchangers and heat sinks’, International Journal of Refrigeration, vol. 38, pp. 7–26.




How to Cite

L.P. Klymenko, E. L. . (2021). Microstructure and properties of polymeric composite materials based on polyethylene and thermally extended graphite for transport systems. JOURNAL OF HYDROCARBON POWER ENGINEERING, 8(1), 26–32. https://doi.org/10.31471/2311-1399-2021-1(15)-26-32