Investigation of the adiabatic elasticity of polystyrene in the glass-transition region

Experimental results are presented for the density, absorption coefficient, and speed of ultrasound in a morphous polystyrene at frequencies of 375, 910, and 2350 kHz on the temperature interval 15–140°C. The glass-transition temperature does not depend on frequency. The adiabatic elasticity and characteristic impedance are calculated.Kolomna Branch of the All-Union Correspondence Polytechnic Institute. Translated from Mekhanika Polimerov, No. 4, pp. 746–749, July–August, 1973.