Metal Chelate Monomers Based on Nickel Maleate and Chelating N‐Heterocycles as Precursors of Core‐shell Nanomaterials with Advanced Tribological Properties

Abstract

In this study, new metal chelate monomers based on nickel(II) maleate and chelating N‐heterocycles (2,2′‐bipyridine and 1,10‐phenanthroline) were synthesized and characterized. A detailed analysis of the main stages and features of the kinetics of thermal transformations of metal chelate monomers was carried out. Core‐shell nanomaterials containing nanoparticles of nickel oxide and metallic nickel in a stabilizing nitrogen‐containing polymer matrix were obtained by thermolysis of these monomers. The composition, properties and structure of the nanomaterials were studied using IR spectroscopy, thermal analysis, X‐ray diffraction, atomic force microscopy, scanning electron microscopy, high‐resolution transmission electron microscopy, and energy dispersive X‐ray spectroscopy. The tribological characteristics of NiO nanoparticles as lubricant additives were studied using a pin‐on‐disc tribometer. The coefficient of friction (COF) is the lowest at the optimum concentration of nanoparticles and increasing the concentration above the optimum level leads to an increase in COF.

Self-Healing of Polymers and Polymer Composites

“…In recent years, a direction based on the preparation of metal-containing monomers (MCMs) with terpyridine fragments and metallocopolymers based on them, which have self-healing properties, has been intensively developed [180][181][182]. A series of mixed-ligand complexes based on unsaturated carboxylic acids (maleic, acrylic, β-phenylacrylic, and itaconic), as well as cobalt(II) [183], nickel(II) [184,185], copper(II), and zinc(II) [186,187] ions were obtained by the interaction of metal-containing monomers with 4-phenyl-2,2 :6 ,2terpyridine (Figure 17). MCMs of this type are of interest from the point of view of the presence of M-L coordination bonds and the stereochemistry of the chelate site, as well as because of the effect of the metal ion on the reactivity of the double bond during polymerization and the possibility of creating a wide range of polymer architectures, including metallosupramolecular polymers with self-healing properties.…”

Preparation of Copper‐containing Nanocomposites by Thermolysis of Copper (II) Complex and Their Use as Anti‐friction and Anti‐wear Additives to Lubricant Oils

“…We have previously shown [28–35] that the nature of the precursor has a significant impact on the main characteristics of the resulting nanomaterials. In particular, the introduction of long‐chain hydrocarbon radicals into precursor molecules helps stabilize NPs and prevents their aggregation [36] .…”

FeCo@N‐Doped Nanoparticles Encapsulated in Polyacrylamide‐Derived Carbon Nanocages as a Functional Filler for Polyethylene System

“…Recently, nitrogen-metal-carbon (NMC) NPs obtained by thermolysis of precursors containing these elements have received wide attention due to their natural content, economic attractiveness and extended functionality. [23][24][25][26][27][28][29] Previous studies have shown that the activity of NÀ MÀ C catalysts largely correlates with the properties of precursors, thermolysis conditions, type of carbon, content of elements, etc. [30] Recently, Zhou et al synthesized an Fe/N co-doped graphitic carbon bulb with a high nitrogen content by pyrolysis of a Prussian blue precursor at a low temperature of 550°C.…”