Alternating current conductivity and dielectric relaxation of PANI:PVDF composites. Issue 1 (18th April 2014)

• Record Type: Journal Article
• Authors: Saïdi, Sami; Mannaî, Aymen; Bouzitoun, Mouna; Belhadj Mohamed, Abdellatif
• Is Part Of: European physical journal. Number 66:Issue 1(2014:Apr.)
• Publication Date: 2014-04-18
• Subjects: Physics -- Periodicals; Microscopy -- Periodicals; Microchemistry -- Periodicals; Microstructure -- Periodicals; 530
• DOI: 10.1051/epjap/2014130245
• Languages: English
• ISSNs: 1286-0042

Abstract

Abstract : In this work, PANI:PVDF composites films were prepared with different PANI contents ( p = 1, 2, 3, 4 and 5%). The resulting films were dried at various temperatures such as 30, 90 and 120 °C. The alternating current mechanisms and dielectric relaxation and of PANI:PVDF films were studied using complex impedance spectroscopy over a wide range of temperature (303–453 K) and a frequency range (1 kHz to 1 MHz). We found that the ac conductivity in PANI:PVDF composite is governed by correlated barrier hopping (CBH) model. In dielectric loss modulus study, two relaxation processes were identified. The first peak was associated to Maxwell Wagner-Sillas (MWS) relaxation whereas the second one which obtained at higher frequency was attributed to the α c relaxation. For PANI:PVDF film which dried at 30 °C, the MWS relaxation appears only at higher temperature. The temperature dependence of α c relaxation was suitably fitted according to Vogel Flucher Temman model whereas MWS relaxation follows Arrhenius type behavior. The effect of drying temperature on microstructure and phase crystallization of PVDF in the composites was carried out using atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. These results were used to find a reasonable correlation between microstructure and electrical properties.