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Abstract : In this research, a polymeric composite material with a polystyrene basis reinforced with zinc oxide (ZnO) nanoparticles was manufactured at a percentages of (5, 10, 15, 20 and 25%). Samples were subjected to the surface hardness, Flexural strength tests to identify their ability to endure the thermophysical effect (T= 40, 60 and 80C°) and in specified periods of time (3, 6 and 9 hours). Results showed that an increase in the values of surface hardness and flexural strength when adding ZnO nanomaterial to the polystyrene with a concentration of 20% and temperature of 80 Cº according to the control treatment. From the other hand, the values began to decrease when the percentage of the ZnO nanoparticles to 25%. These values differed with the difference in the temperature of the sample treatment and also with the period of the exposure of the samples to the thermophysical effect. Results of X-ray diffraction spectrum and Scanning Electron Microscopy images showed the beginning of decomposition of polystyrene reinforced with ZnO nanoparticles with a concentration of 20% under a temperature of 60 Cº.

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