ポリ酢酸ビニル-トルエン溶液の超音波吸収と誘電分散

概要

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The ultrasonic absorption in solution of polyvinyl acetate in toluene was measured in the frequency range from 1 to 6 MHz. The temperature range was from -20° to 60 ℃ , and the concentration of the solutions was 5.42g/100 ml. The degree of polymerization of the sample of polyvinyl acetate was 900. The plot of Δ(α/f^2) against frequency was represented by a single relaxation curve over the whole temperature range. With the rising temperature, the relaxation frequency f_r increased and the absorption maximum per wavelength μ_<max> decreased. The energy difference ΔH_0 and the actixation energy ΔH_<21> were estimated from the change of temperature of the absorption on the basis of two-state model. The values obtained were : ΔH_0=1.36 kcal/mol, and ΔH_<21>=1.0 kcal/mol.
社団法人日本材料学会の論文
1972-05-15