Electrical and microwave absorbing properties of polypyrrole synthesized by optimum strategy

The polypyrrole (PPy) was prepared by in situ solution polymerization. The structure and morphology were characterized by X-ray diffractometry, scanning electron microscope (SEM), and transmission electron microscope, respectively. The electrical and dielectric properties of the PPy were measured by four-point technique and impedance/materials analyzer. The results revealed that reaction time, reaction temperature, the types of doping agent, and the molar ratio of initiator to pyrrole monomer (nAPs/nPy) had an important effect on electrical and dielectric properties of the PPy. It showed that the PPy doped with phosphoric acid and with nAPs/nPy = 1 at 10°C for 12 h had better performance of electrical conductivity and dielectric loss. The PPy sample with 2 mm thickness had a minimum reflection loss value of −19.68 dB at approximately 16 GHz and an available bandwidth of 6.2 GHz in the range of 8–18 GHz. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013