Dielectric relaxation spectroscopy of poly (vinyl chloride-co-vinyl acetate-co-2-hydroxypropyl acrylate)/poly (acrylonitrile-butadiene-styrene) polymer blend

The dielectric techniques used to investigate the relaxation behavior of poly ( vinyl chloride-co-vinyl acetate-co-2-hydroxypropyl acrylate) (PVVH), poly (acrylonitrile-butadiene-styrene) (ABS), and its polyblends include broadband AC dielectric relaxation spectroscopy (DRS) in the frequency range from 10(-2) to 10(5) Hz, and thermally stimulated depolarization current (TSDC) technique in the temperature range from 300K to 413 K. It was observed that PVVH is characterized by a dipolar relaxation peak around 347K and a space charge peak in the temperature range 353 383 K, whereas pure ABS is characterized by a dipolar relaxation peak at 389 K. On the other hand, polyblend samples are found to be characterized by two different relaxation peaks at 359K and 387 K, respectively. The dielectric properties of pure materials and their polyblend are investigated. All samples are characterized by high dielectric constant (epsilon') at very low and high temperature. The dielectric loss shows a single peak for pure materials, whereas polyblends show a broad peak at low frequency which could be attributed to the Maxwell-interfacial polarization (MWS) and another peak at high frequency which could be attributed to the dipolar relaxation. The temperature dependence of AC conductivity was investigated for all samples. The values of the exponent n suggest that the hopping mechanism dominates at lower temperatures.