Abstract

Sound speeds for gigahertz frequencies were measured as a function of temperature from 25°C to 110°C in clean samples of polystyrene by stimulated Brillouin scattering. The effect on the sound speeds of annealing the polymer was shown. The glass transition temperature was determined to be 95°C from which the number averaged molecular weight was found. Damage observations were made on the prepared sample and compared with those made on commercial samples.

© 1972 Optical Society of America

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