Abstract
A Brillouin scattering study of poly(methy1 methacrylatelltoluene mixtures at various polymer concentrations and temperatures has been carried out. The temperature dependences of the Brillouin shifts and line widths are qualitatively explained in terms of the relaxation time model. The concentration de- pendences of the Brillouin data are discussed in light of a theory for Brillouin light scattering from gels proposed by Marqusee and Deutch (M&D). The speed of sound in the network and frictional damping have been evaluated from the Brillouinshiftaand line widths, respectively. Although it provides arealistic description of the data at the lower concentrations, the M&D theory breaks down in the vicinity of the line-width maximum, giving values of the frictional coefficient which are too small in this region.
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