Synthesis, structure and antioxidant activity of sulfur-containing tetrakisphenol

Nugumanova, G. N.; Barsukova, T. A.; Бухаров, С. В.; Krivolapov, D. B.; Литвинов, И. А.; Syakaev, Victor V.; Mukmeneva, N. A.; Бурилов, А. Р.

doi:10.1134/s1070363210070200

Cited by 2 publications

(3 citation statements)

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“…Antyutleniacze stosowane są w prawie wszystkich smarach plastycznych, ponieważ w większości przypadków okres trwałości smaru jest ograniczony przez utlenianie się oleju bazowego. Najbardziej skutecznymi antyutleniaczami, działającymi jako akceptory wolnych rodników i stosowanymi w wielu dziedzinach, są mono-, di-i policykliczne pochodne fenolu, które zwykle podstawione są podstawnikami alkilowymi w pozycjach 2 i 6 (Nugumanova et al, 2010). Przykładowo 3-(3,5-di-tert-butylo-4-hydroksyfenylo)propionian metylu jest jednym z najważniejszych estrów kwasu hydroksyfenylokarboksylowego, który jest nie tylko skutecznym inhibitorem utleniania, ale także kluczowym materiałem (Li et al, 2014).…”

Section: Modyfikacja Stabilności Termooksydacyjnej Smarówunclassified

Stabilność termooksydacyjna smarów plastycznych

Skibińska¹,

Badawczy²

2021

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This review article deals with a particular property of lubricating greases – resistance to oxidation. This property, also referred to as oxidative or thermal oxidation stability, has a decisive influence on the quality and duration of lubricating greases service life in friction nodes, bearings and lubrication systems. Lubricating greases are colloidal systems in which the thickener creates an elastic three-dimensional network, maintaining the liquid phase. The structure of lubricating greases, division of greases into types, depending on the thickener used, is presented. The basic additives in lubricating greases are described, and the group of used antioxidant additives is discussed in detail. Under operating conditions, the grease is subject to factors that cause its destruction – shear stress, pressure, loads, changing operating conditions, especially temperature changes. The types of lubricating greases degradation are presented, as well as methods and techniques of aging processes evaluation. During operation, the grease fulfilling its basic functions in the lubrication system is primarily exposed to high temperatures. The predominant aging process which directly affects the service life of the grease is oxidation. The oxidation process is discussed, with the specification of its four stages: initiation, propagation, chain branching and termination. One of the methods of preventing the oxidation process is the selection of appropriate improvers. Thermal oxidation stability of greases can be modified by introducing appropriate antioxidants, the selection of which depends on the type of grease thickener and the operating temperature of the grease. The published literature review from over the last ten years shows how diverse are the ways of modifying thermal oxidation stability of greases and the methods of assessing this property.

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Section: Modyfikacja Stabilności Termooksydacyjnej Smarówunclassified

Stabilność termooksydacyjna smarów plastycznych

Skibińska¹,

Badawczy²

2021

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“…Kinetics of hydroperoxide accumulation in the autooxidation of linoleic acid in the presence of the salicy lamides: (1) blank experiment (in the absence of AO) and(2)(3)(4)(5) amides I, II, III, and IV, respectively. The AO con centration is 2 × 10 -4 mol/L, 60°C.…”

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“…These properties make the salicylic acid derivatives promising for the prophylaxis of skin cancer and pho todegradation. As a rule, new generation antioxidants (AOs) contain several characteristic groups that syner gically enhance their effect during oxidation [5][6][7][8]. Therefore, phenolic derivatives of salicylic acid can be of interest as oxidation inhibitors and polymer photo stabilizers.…”

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Interrelation between the chemical structure and antioxidant properties of N-substituted amides of salicylic acid

et al. 2012

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The kinetics of the initiated oxidation of a model lipid (methyl oleate has been investigated in the presence of a group of new "hybrid" structures, namely, N substituted amides of salicylic acid whose struc ture contains an amide residue conjugated with, or separated by a bridging fragment (three methylene groups) from, an N phenolic substituent. The compounds also differ in the degree of screening of the OH groups. The process was initiated by thermal decomposition of azobisisobutyronitrile at 60°C (initiation rate of w i = 4.2 × 10 -8 mol L -1 s -1 ) or by UV irradiation (λ = 313-365 nm, w i = 0.6 × 10 -8 mol L -1 s -1 ). The compounds examined exhibit antiradical activity owing to the presence of the phenolic hydroxyl groups. N substituted salicylamides efficiently inhibit the overall methyl oleate oxidation process and are comparable in activity with dibunolum and α tocopherol or are superior to them. The structures in which the residues of salicyla mide and sterically hindered phenol are separated by the bridging fragment are particularly efficient. The advantages of the salicylamides absorbing at 300-365 nm manifest themselves in UV initiated oxidation. The peroxidase activity of the N substituted salicyl acid derivatives is determined by the structure of the amide moiety. The compounds examined here are new, promising, effective antioxidants, whose particular structural fragments act via different mechanisms in oxidation.

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Synthesis, structure and antioxidant activity of sulfur-containing tetrakisphenol

Cited by 2 publications

References 2 publications

Stabilność termooksydacyjna smarów plastycznych

Stabilność termooksydacyjna smarów plastycznych

Interrelation between the chemical structure and antioxidant properties of N-substituted amides of salicylic acid

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