The inhibition performance of Basic yellow 13 dye on mild-steel corrosion in hydrochloric acid solution was studied at 25°C using weight loss and electrochemical techniques. The effect of inhibitor concentration on inhibition efficiency has been studied. Inhibition efficiency increased with increase of Basic yellow 13 concentration. The results showed that this inhibitor had good corrosion inhibition even at low concentrations (95% for 0.005 M Basic yellow 13) and its adsorption on mild-steel surface obeys Langmuir isotherm. DG ads was calculated and its negative value indicated spontaneous adsorption of the Basic yellow 13 molecules on the mild-steel surface and strong interaction between inhibitor molecules and metal surface. The value of DG ads was less than 40 kJmol -1 , indicating electrostatic interaction between the charged inhibitor molecules and the charged metal surface, i.e., physical adsorption.
Reversible addition-fragmentation chain transfer (RAFT) polymerization enables the synthesis of controlled architectures for a wide-variety of polymers with defined end and pendant functionalities using mild conditions. A simple synthetic route for the preparation of polystyrene (PS)/ZnO nanocomposite with well-defined structure is demonstrated. ZnO nanoparticles were synthesized by homogeneous precipitation. To reduce the aggregation among ZnO nanoparticles, an effective surface modification method was proposed by grafting polystyrene onto the ZnO particles. The surface of ZnO nanoparticles was firstly treated with a 4-cyano-4-[(4-methoxyphenyl carbon thiol) solfanylvaleric acid] coupling RAFT agent in the presence of THF as a solvent at 658C. A carboxylic group in raft agent attached to ZnO nanoparticles by the esterification reaction with the hydroxyl groups on the ZnO particle surface. Then, RAFT polymerization of styrene was subsequently conducted to graft PS onto the exterior surface of ZnO nanoparticles by new RAFT agent 4-cyano-4-[(4-methoxyphenyl carbon thiol) solfanylvaleric acid]. The obtained nanocomposite was characterized by Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric (TGA), transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). POLYM. ENG. SCI.,
Due to the strong tendency of nanoparticles such as metal oxides to agglomerate, homogeneous dispersion of these materials in a polymeric matrix is extremely challenging. In order to overcome this problem and to enhance the filler-polymer interaction, this study focused on living polymerization that was initialized from the surface of titanium fillers. A new method for synthesizing TiO 2 /polymer nanocomposites was found with a good dispersion of the nanofillers by using the RAFT agent, 4-cyano-4-[(phenyl carbon tool) solfanylvaleric acid. This RAFT agent has an available carboxyl group to anchor onto TiO 2 nanoparticles, and an S ¼ C (C 6 H 5 ) moiety for subsequent RAFT polymerization of 4-chloromethyl styrene (PCMS) to form n-TiO 2 /4-chloromethyl styrene nanocomposites. The functionalization of n-TiO 2 was determined by FTIR and partitioning studies, the livings of the polymerization were verified using GPC, while the dispersion of the inorganic filler in the polymer was studied using electron microscopy, FTIR and thermal analysis.
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