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Brillouin scattering has been studied from amorphous bisphenol‐A polycarbonate in the temperature interval 60–240°C. Both longitudinal and transverse Brillouin peaks are observed over the entire range. The behavior of both types of Brillouin splittings, Δω l and Δω t , in the region of the glass–rubber relaxation is typical of an amorphous polymer. Equilibrium values of Δω l and Δω t were obtained 20°C below the glass‐transition temperature T g determined at cooling rates of 20°C/hr. Comparison of the present results with previous ultrasonic data reveals a considerable dispersion in the longitudinal phonon velocity below T g . The origin of the large transverse Brillouin intensities is related to the structure of polycarbonate.
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G. D. Patterson (1976) studied this question.
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