Abstract
Abstract The Brillouin scattering spectra of diisobutyl phthalate were measured over a wide range of temperatures. The sound velocity dispersion was observed in the GHz region in a temperature range between 240 and 340 K. We concluded that the sound dispersion of the sample was attributed to the structural relaxation of a supercooled liquid. The relaxation curve of the longitudinal modulus was obtained by a superposition method and could be analyzed using a generalized B.E.L. model with a parameter of K=0.3–0.5. The viscoelastic relaxation in the GHz region was found to have a narrower distribution of relaxation times than in the MHz region.
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