Dielectric relaxation studies in n-butyl-4,5,7-trinitrofluorenone-2-carboxylate/LexanR polycarbonate solid solutions

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Abstract
The α and combined low‐temperature dielectric relaxations of n‐butyl‐4,5,7‐trinitrofluorenone‐2‐carboxylate (BuTNF)/LexanR polycarbonate solid solutions have been studied. It has been shown that only in the specific case of the β relaxations in the components does a correlated motion exist. For the α (Tg) relaxations, the relaxation modes are shown to coexist and are dependent upon composition. The intensity of the dielectric Tg relaxation is dominated by BuTNF. The sub‐Tg relaxations of the system are different. At intermediate compositions, a correlated β relaxation of the polymer–small‐molecule combination is observed. With the exception of the correlated β relaxation, the individual intensities appear to be relative functions of the molar concentrations. This study indicates that BuTNF acts as a plasticizer for the α and γ 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.