ポリスチロール溶液での超音波速度とその温度変化について

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We measured the ultrasonic velocity(frequency 444kc)in the polystyrene-benzene solution by the interferometer method. The molecular weight of the used polystyrene sample was about 446, 000. First, the dependence of velocity on concentration was observed. We found that the velocity increased with increase of concentration in diluted solution up to the concentration of 0. 03gr/cc, in which the velocity attained 1339m/sec, but in concentrated solutions above that the velocity was approximately constant. This suggests that, also in the high frequency region there are two different states in high polymer solutions, as in dicated by static measurements of viscosity and specific volume. And the boundary concentration between these two states obtained by this measurement is of the same order of magnitude as obtained from static ones. We calculated the velocity of this diluted solution by employing a model analogous to Eyring's free volume model, and velocity values obtained are in good agreement with the experimental ones. We calculated the adiabatic compressibility of this solution in various concentrations from the velocity and density data. Next, we observed the temperature dependence of velocity in concentrated solutions with various concentration. In each concentration, the abrupt increasement of velocity in the neighbourhood of the melting point of benzene were observed. This suggests that the concentrated polymer solution might have some transition region in this temperature region.
社団法人日本音響学会の論文
1952-06-30

ポリスチロール溶液での超音波速度とその温度変化について

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