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In the present study, an attempt has been made to synthesize soluble PPy via inverse emulsion polymerization pathway using benzoyl peroxide as an oxidant and dodecylbenzenesulfonic acid (DBSA) as dopant as well as a surfactant. A mixture of chloroform and 2-butanol was used as dispersion medium for the first time. Pyrrole polymerized into PPy inside the micelle under these conditions. The influence of synthesis parameters such as amount of pyrrole, benzoyl peroxide (BPO) and DBSA on the percent yield and other properties of the resulting PPy was studied. The synthesized PPy was found to be completely soluble in DMSO, DMF, THF, chloroform and mcresol etc. The structure of PPy and incorporation of DBSA in the polymer backbone was confirmed by FT-IR. UV-Vis spectra of PPy showed correspondence with the electrical conductivity of the prepared salts. SEM micrographs showed the typical granular morphology of PPy-DBSA. TGA and XRD of the prepared PPy samples were also studied and explained. [ABSTRACT FROM AUTHOR]

Sol--gel coatings offer a number of advantages over other methods of protection for metallic materials. In the present work, 3-mercaptopropyltrimethoxysilane (MPTS) was used as the precursor for sol--gel coating on aluminium metal. The gelation of MPTS sol--gel was characterized by Fourier transform infrared spectroscopy (FT-IR) studies. The formed film was found to be stable up to 350 °C as evident from thermogravimetric analysis. X-ray diffraction study and scanning electron microscopy supported the formation of MPTS coating on aluminium surface while the characterization of the coating was done by FT-IR studies. The corrosion inhibition potential of the sol--gel coatings on metal in 3.5% (w/v) of NaCl solution was assessed as a function of different concentrations of MPTS using electrochemical polarization and impedance measurements. The corrosion inhibition efficiency was found to increase with increasing MPTS concentration. The results of the study unravel the use of MPTS as a precursor in the formation of sol--gel coating over aluminium surface so as to protect the metallic surface from corrosion in neutral environment. [ABSTRACT FROM AUTHOR]