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Abstract
The photoacoustic (PA) spectra of poly‐bis‐phenol‐A carbonate (PC) and its monomer bis‐phenol‐A (BA) were recorded in the wavelength range from 200 to 800 nm at a modulation frequency of 22.5 Hz. The PA spectrometer used consisted of a 300 watt xenon arc lamp, lock in‐amplifier, chopper, 1/4‐m monochromator, and a home made PA cell. The PA spectrum of PC was compared with that of BA. Results revealed strong absorption in the UV region (200–400 nm). The phosgenation absorption bands in PC are red shifted as compared to corresponding bands in the monomer BA. Thermal diffusivity of test materials was evaluated by measuring the PA signal and phase angle at different modulation frequencies (20–200 Hz) using a He–Ne laser (632.8 nm) as an excitation source. Thermal diffusivity obtained in the present study was then used to calculate the thermal conductivity of PC.
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