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Abstract
Measurements of ultrasonic absorption were carried out for polycarbonate in dioxane and in chloroform at frequencies from 1 to 130 MHz over a temperature range of 10 to 55°C. The molecular weight of the sample was about 4.0×104. In both systems double relaxation processes were observed. For the first relaxation process (at a lower frequency) the relaxation frequencies of polycarbonate in solutions do not differ very much from those of vinyl-type polymers in spite of structural differences in the backbone chains. The first relaxation process is attributed to the local segmental motions concerned with several monomer units or more. The second relaxation process (at a higher frequency) in solutions of polycarbonate and of vinyl-type polymers are strongly affected by solvents.
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