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Antioxidants
Published in Leslie R. Rudnick, Lubricant Additives, 2017
Robert G. Rowland, Jun Dong, Cyril A. Migdal
The Mannich reaction was used to couple an ethoxylated alkyl phenol with an alkyl arylamine. The resulting products had markedly improved antioxidant activity relative to an equal weight loading of the amine alone and were noted as having improved solubility in oils [145]. Phenolic imidazolines have been prepared from polyaminophenols and carbonyl compounds [146]. In addition to providing antioxidant activity, the products also have corrosion inhibition and metal deactivation properties owing to the cyclic imidazoline moiety.
Corrosion protection of 1018 carbon steel using an avocado oil-based inhibitor
Published in Green Chemistry Letters and Reviews, 2019
O. Sotelo-Mazon, S. Valdez-Rodriguez, J. Porcayo-Calderon, M. Casales-Diaz, J. Henao, G. Salinas-Solano, J. L. Valenzuela-Lagarda, L. Martinez-Gomez
The molecular structure of imidazoline consists on a five-membered ring, which contains two atoms of nitrogen (head group), a hydrocarbon chain (hydrophobic tail) and a pendant side chain attached to one of the nitrogen atoms. (6–8). It is well known that the adsorption of this type of inhibitors on a metal surface can occur by either physical or chemical adsorption processes. The chemical adsorption can be conducted by formation of an iron–nitrogen coordinate-type bond and by a pi-electron interaction between the pi-electron in the head group and iron. Alternatively, the physical adsorption is given by coulombic attraction, which involves electrostatic attraction between the charged metal surface and the charged molecules of the inhibitor (9, 10). Some authors have mentioned that the length of the hydrocarbon chain in the imidazoline structure is also known for their ability to form protective films (8, 11, 12), due to the unsaturation of oil-like tails (hydrophobic tail). This feature favors the adsorption on the metal surface by means of a flat-adsorption process, blocking active sites and reducing the corrosion process (5).
Synthesis, surface active properties and applications of cationic gemini surfactants from triethylenetetramine
Published in Journal of Dispersion Science and Technology, 2020
Ishwar T. Gawali, Ghayas A. Usmani
Imidazoline surfactants having better surface properties compared to other conventional surfactants. The surfactants derived from imidazoline have good performance properties and mildness to eyes, skin and clothes. They are used as fabric softeners, dispersants, anti-static agents, bleach activators, emulsifiers. They are easily biodegradables.[4] In addition, imidazolines compounds are used in the paint and lubricant industries because of their corrosion inhibition properties.[5] The 2-substituted imidazolines and their derivatives exhibit a wide variety of biological activities including anti-percholesterolemic, anti-inflammatory, anti-diabetic and anti-hypertensive properties.[6]
Electrochemical and molecular modelling studies of corrosion inhibition characteristics of imidazolines on 1Cr steel under sweet conditions
Published in Corrosion Engineering, Science and Technology, 2023
Shivangi Gupta, Rouhollah Yazdi, Martin Andersson, Rajan Ambat
Among the various organic compounds that are currently being used for corrosion inhibition, derivatives of imidazoline are highly preferred due to their high corrosion inhibition efficiency and low toxicity. The imidazoline adheres to the metallic surface and also repels substances that are present in the medium [1]. Therefore, minimal concentrations of inhibitors are required for better efficiencies, leading to lower environmental toxicity [1].