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The polystyrene dopped with 2,5-diphenyloxazole as a primary fluor and2-(4-styrylphenyl)benzoxazole as a wavelength shifter, prepared as a plasticscintillator was investigated using positronium probe in wide range oftemperatures from 123 to 423 K. Three structural transitions at 260 K, 283 Kand 370 K were found in the material. In the o-Ps intensity dependence ontemperature, the significant hysteresis is observed. Heated to 370 K, thematerial exhibits the o-Ps intensity variations in time.

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix