Abstract
We report measurements of the hydrostatic pressure dependence of the elastic constants of poly(methyl methacrylate) using high resolution Brillouin spectroscopy. We have measured the density ρ( p) 0 up to 500 MPa, and the longitudinal and transverse sound velocities up to 300 MPa. We have calculated the bulk modulus, Youngs modulus, shear modulus and Poisson's ratio. Initially there is a strong increase in the intensity of the shear phonons which levels off at p > 100 MPa. At this pressure a dispersion-like step in the shear modulus as well as a decrease in the bulk modulus is found, which is tentatively discussed as a ‘weak glass transition’ within the glass.
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