Electrically conductive polyaniline (PANi) doped with anionic surfactants is successfully synthesized and characterized. The conductive PANi is prepared by chemical oxidation polymerization reaction with the addition of two types of anionic surfactant solutions respectively 1% Sodium Octyl Sulfate (NaC8H17SO4, SOS) and Sodium Dodecyl Sulfate (NaC12H25SO4, SDS), followed by doping with a strong perchloric acid (HClO4). The addition of each surfactant solution has increased the electrical conductivity value of surfactant free PANi from 0.089 to 1.16 S cm−1 (SOS) and 1.12 S cm−1 (SDS) respectively. The viscosity value of surfactant free PANi is 1.97 mPa s which is much lower when compared with those of PANi containing surfactants in which the value is 3.58 and 4.20 mPa s for 1% of SDS added PANi each. The chain length of anionic surfactant has no major effect on the conductivity of PANi. The latter is only affected by the presence of SO3− group in hydrophobic part of surfactant.
In this paper, we report magnetic and microwave absorbing properties of magnetic based nanocomposite, which synthesized through mechanically alloyed the magnetic crystalline powders. The first component of composite was Mn-Ti doped Barium hexaferrite(BaFe12O19) or BHF obtained through a mechanical alloying process which was mixed with the second component of mechanically alloyed the CoFe2O4magnetic compound to form composites of [Ba (Fe, Mn, Ti)12O19]1-x–[CoFe2O4]x (x = 0.2; 0.5; 0.8) compositions. Prior to composite the two magnetic components, the remanence and saturation magnetization of the components were obtained optimally. Before Mn-Ti doping, the BHF has remanence (Mr) and saturation magnetization 0.206 T and 0.42 T respectively, with the corresponding coersivity (Hc) was 263.1 kA/m. On the other hand, CoFe2O4 (CFO) which has a high saturation magnetization(0.48 T) but with a low coersivity(16.22 kA/m). In form of magnetic composite, the high remanence was almost retained, but with the coersivity value decreased further to the lowest 80.82 kA/m. These two main properties (high remanance and low coersivity) were led the composite being good candidates for microwave absorbing materials. Microwave absorbing characteristics of [Ba(Fe, Mn, Ti)12O19]1-x–[CoFe2O4]x (x = 0.2; 0.5; 0.8) composites were discussed in this paper relation with their corresponding magnetic properties for designing the best microwave absorbing materials.
Polypirrole (PPy) is one of conductive polymer material has been success sinthesized through polymerization process using chemical oxidative reaction by batch polymerization technique. The synthesis was conducted at room temperatur with agitation speed within 300-500 rpm. The certain amount of pirolle monomer was reacted with ammonium persulphate in the aquaeous media. Demineralized water is the only one solvent was involved in the reaction. The presence of 0%, 1% and 2% of Polyvinyl alcohol (PVA) in the synthesis of PPy was investigated. Washing process found maximal after four times washing indicated by FTIR spectrum, phisical appearance, color and conductivity value of the filtrate of residual washing treatment. While the synthesized PPywith presence of PVA obtained higher conductivity compare when PVA free. The conductivity value was 57,000, 56,000 µs/cm for additional 1% and 2% of PVA respectively. It is significantly increased when PVA free involved in the reaction. Other supporting characterization during synthesis was conducted such as pH measurement, density, viscosity, temperature and colour degradation observation. The appearance of PPy when presence PVA is being emulsion and different when absence of PVA which obtained powder or solid form of PPy. Black polymer emulsion with various viscosity of PPy was observed completely.
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