Abstract
Polypyrrole (PPy), one of the most extensively investigated conducting polymers, has attracted a great deal of interest because of its good electrical conductivity, environmental stability, and easy synthesis. PPy films were produced by polymerization of pyrrole and tosylate (TsO−) as dopants in the presence of oxidant FeCl3 and polyethylene glycol (Mw 8000) at −5°C for 48 h. High energy milling was carried out at 850 rpm in the dry media with the balls of 10 mm. Particles were then characterized by Scanning Electron Microscope and Dynamic Light Scattering techniques for size distribution, and it was found that the size of PPy particles is a decreasing function of time of milling. Electrical conductivity was measured by preparing a homogenous aqueous dispersion of PPy particles and found as exponential decreasing function of time of milling. The changes occurred in PPy after milling was analyzed by Differential Scanning Calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR).
Highlights
Polypyrrole (PPy), one of the most extensively investigated conducting polymers, has attracted a great deal of interest because of its environmental stability and easy synthesis along with its good electrical conductivity [1]
Particles were characterized by Scanning Electron Microscope and Dynamic Light Scattering techniques for size distribution, and it was found that the size of PPy particles is a decreasing function of time of milling
The changes occurred in PPy after milling was analyzed by Differential Scanning Calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR)
Summary
Polypyrrole (PPy), one of the most extensively investigated conducting polymers, has attracted a great deal of interest because of its environmental stability and easy synthesis along with its good electrical conductivity [1]. Along with its other applications, PPy can be used as conducting filler in insulating polymer matrices in preparation of electrically conducting composites. Recent studies showed that the addition of polymers can influence the conductivity by steric stabilization of the polypyrrole chains [8]. To this end, water-soluble polymers of molecular masses over 20,000 g⋅mol−1, such as methyl cellulose, poly(vinyl alcohol-co-acetate), poly(ethylene oxide), poly(vinylpyrrolidone), poly(2-vinylpyridine), and poly(vinylmethylether), were studied. Water-soluble polymers of molecular masses over 20,000 g⋅mol−1, such as methyl cellulose, poly(vinyl alcohol-co-acetate), poly(ethylene oxide), poly(vinylpyrrolidone), poly(2-vinylpyridine), and poly(vinylmethylether), were studied When using these additives, conductivities of a broad range (1×10−9–12 S⋅cm−1) have been obtained [8]. For this reason PEG 8000 was added in the preparation of PPy
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