The agr; and combined low‐temperature dielectric relaxations ofn‐butyl‐4,5,7‐trinitrofluorenone‐2‐carboxylate (BuTNF)/LexanRpolycarbonate solid solutions have been studied. It has been shown that only in the specific case of the bgr; relaxations in the components does a correlated motion exist. For the agr; (Tg) relaxations, the relaxation modes are shown to coexist and are dependent upon composition. The intensity of the dielectricTgrelaxation is dominated by BuTNF. The sub‐Tgrelaxations of the system are different. At intermediate compositions, a correlated bgr; relaxation of the polymer–small‐molecule combination is observed. With the exception of the correlated bgr; relaxation, the individual intensities appear to be relative functions of the molar concentrations. This study indicates that BuTNF acts as a plasticizer for the agr; and ggr; relaxations of polycarbonates and interacts directly with the phenyl group of the polycarbonate producing a correlated motion. This interaction affects the potential field causing the relaxation, but does not plasticize the relaxation.
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