Photon correlation spectroscopy is employed to study the slowly relaxing density and anisotropy fluctuations in bulk atactic polystyrene as a function of pressure at 146 °C from 1 bar to 1.33 kbar. The light scattering relaxation function observed as a function of pressure is identical in shape to that observed previously as a function of temperature. The average relaxation time changes by nearly 4 decades per kbar as the polystyrene sample approaches the glass transition along the isothermal path. The present results represent the first step in the study of light scattering under high pressure near the glass transition in polymers.
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Patterson et al. (1982) studied this question.
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