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Contour maps of complex relative permittivity within the range ‐ 175°C to 195°C and 0.1 Hz to 3 MHz are presented for basic and ultraviolet resistant grades of a commercial poly(dian carbonate). Several dispersion regions common to both materials are identified, together with an additional region at high temperatures in the ultraviolet resistant material. Comparisons are made with earlier investigations, and possible sources are suggested for each dispersion.
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Pratt et al. (1986) studied this question.
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