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Secondary Retardation/Relaxation Processes in Bisphenol A Polycarbonate: Thermostimulated Creep and Dynamic Mechanical Analysis Combined Investigations

Abstract Thermostimulated creep (TSCr) and dynamic mechanical analysis (DMA) have been used to analyze the complex secondary retardation/relaxationmode of bisphenol A polycarbonate (PC). TSCr and DMA studies have been combined to extend the frequency range using the very low equivalent frequency of TSCr measurement (≈ 10−3 Hz). The dielectric spectra revealed a bimodal β retardation/relaxation mode with two overlapped components β2 and β1. A thermal sampling (TS) protocol has been applied to TSCr measurements to obtain this β1 mode fine structure. TSCr has proved to be a powerful tool to analyze the two overlapped contributions.