aromatic secondary amines as antioxidants for polyolefins

aromatic secondary amines as antioxidants for polyolefins

Aromatic secondary amines as antioxidants for polyolefins

The thermoxidation of polypropylene (PP) at 200 °C in the presence of phenothiazine (1) and 3,7-di-tert-butylphenothiazine (2) was studied by measurin…

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aromatic secondary amines as antioxidants for polyolefins

Aromatic secondary amines as antioxidants for polyolefins

Polymer Degradation and Stability 44 (1994) 201-209 ~ ~. ^JU ELSEVIER Aromatic secondary amines as antioxidants for polyolefins: Part 1--9,10-Dihydroacridine (acridan) derivatives Patricia Carloni, Lucedio Greci, Alexander Mar'in, & Pierluigi Stipa Dipartimento di Scienze dei Materiali e della Terra, Universith, Via Brecce Bianche, 1-60131 Ancona, Italy (Received 1 November 1992; accepted 3

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aromatic secondary amines as antioxidants for polyolefins

Aromatic secondary amines as antioxidants for polyolefins

Abstract A series of five acridan derivatives was studied as antioxidants in the thermoxidation of polypropylene. None induced major retardation in the polymer oxidation. Two of them, 9,9-diphenyl- and 9,9-dimethyl-acridans, showed synergism when used in the presence of dilauryl thiodipropionate (DLTP). In order to understand the role of the intermediate nitroxides during the oxidation, 9,9

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10.1016/0141-3910(95)00155-7 | deepdyve

10.1016/0141-3910(95)00155-7 | DeepDyve

The evaporated antioxidant condensed on the walls of the reaction Aromatic secondary amines as antioxidants for polyolejins-2 tube was then dissolved in ethanol and analysed by UV-spectrophotometry. 2.7 Analysis of reaction products after polymer oxidation PP films containing 10% of compound 1 or 2 were oxidised at 160 and 180°C for 30 min

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antioxidants - aromatic amines antioxidants - performance

Antioxidants - Aromatic Amines Antioxidants - Performance

Efficient aromatic amine antioxidant, widely used in polyolefins, styrene copolymers, polyether, hot melt adhesives, lubricants and polyamides with excellent thermal stability and long-term thermal aging properties. 25kg/ bag. Synox-CPL. Wingstay-L. reaction products of p-cresol and dicyclopentadiene and isobutylene. 68610-51-5.

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antioxidants stabilizers selection for polyolefins (pp, pe)

Antioxidants Stabilizers Selection for Polyolefins (PP, PE)

Many antioxidants tend to function as free radical scavengers and they interact with free radicals that are formed during polymerization or in the presence of air or other oxidizing medium. Antioxidants are a known class of stabilizers which includes, for example, hindered phenols, triaryl phosphites, aromatic amines, hydroxylamines, and the like.

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overall introduction of polymer antioxidant | baoxu chemical

Overall Introduction of Polymer Antioxidant | Baoxu Chemical

Primary Antioxidant react rapidly and are termed “radical scavengers'”.The most important are sterically hindered phenolics and secondary aromatic amines. Hindered phenolics are high molecular weight anti-oxidants for polymer systems that are sensitive to thermal and oxidative degradation, due to the formation of free radicals and peroxides.

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10.1016/0141-3910(95)00155-7 | deepdyve

10.1016/0141-3910(95)00155-7 | DeepDyve

The evaporated antioxidant condensed on the walls of the reaction Aromatic secondary amines as antioxidants for polyolejins-2 tube was then dissolved in ethanol and analysed by UV-spectrophotometry. 2.7 Analysis of reaction products after polymer oxidation PP films containing 10% of compound 1 or 2 were oxidised at 160 and 180°C for 30 min

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antioxidant mechanisms of hindered amine light stabilizers

Antioxidant mechanisms of hindered amine light stabilizers

The efficiency of the hindered amines as antioxidants in polyolefins is enhanced by their ability to associate with the unstable oxidized domains in which photo‐ and thermal oxidations will eventually reinitiate. Secondary amines can also slowly decompose intramolecularly hydrogen bonded hydroperoxide groups of the type found in polypropylene.

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about antioxidant activity of hindered aliphatic amines and

About antioxidant activity of hindered aliphatic amines and

About antioxidant activity of hindered aliphatic amines and their derivatives to understand polyolefin stabilization at 25°C—I. Overall effects of SEC-hindered aliphatic amines and their nitroxyl derivatives on the kinetics of primary reactions of gamma-radiation-induced autoxidation of 2,4-dimethylpentane in the dark at 25°C compared with effects of a phenolic antioxidant

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overall introduction of polymer antioxidant | baoxu chemical

Overall Introduction of Polymer Antioxidant | Baoxu Chemical

Primary Antioxidant react rapidly and are termed “radical scavengers'”.The most important are sterically hindered phenolics and secondary aromatic amines. Hindered phenolics are high molecular weight anti-oxidants for polymer systems that are sensitive to thermal and oxidative degradation, due to the formation of free radicals and peroxides.

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antioxidants

Antioxidants

The most effective primary antioxidants are secondary aromatic amines. However, they cause noticeable discoloation and can only be used if discolation is not a problem, like carbon filled rubber products. They also function as antiozonants and metal ion deactivators. Secondary Antioxidants (Peroxide Scavengers)

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thioester antioxidants > songnox® dstdp | vanderbilt

Thioester Antioxidants > SONGNOX® DSTDP | Vanderbilt

SONGNOX® DSTDP is a secondary thioester synergistic antioxidant for use during the processing of organic polymers. It decomposes and neutralizes hydroperoxides formed by the auto-oxidation of polymers and is an antioxidant for plastics, rubber, synthetic fiber, fats, oils and petroleum products, as well as an efficient stabilizer for polyolefins, particularly PP and HDPE.

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antioxidants - hindered phenolic antioxidants - performance

Antioxidants - Hindered Phenolic Antioxidants - Performance

Displays an excellent synergistic effect to long term heat stability (LTHS) when combined with a thioester secondary antioxidant. 25kg/ bag. Synox-1135. Iragnox-1135. Benzenepropanoic acid, 3, 5-bis (1,1-dimethylethyl)-4-hydroxy-, C7-C9 branched alkyl esters. 125643-61-0. Can be used in a variety of polymers.

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antioxidants. - free online library

Antioxidants. - Free Online Library

Naugard antioxidants include hindered phenolics, aromatic amines, and phosphites. Phenolics include Naugard BHT, Naugard 76 and Naugard 10 for polyolefins, styrenics, etc. Liquid phenolic products include Naugard 536 for use in emulsion polymerization such as ABS and Naugard 529 and Naugard SP.

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emerging aromatic secondary amine contaminants and related

Emerging aromatic secondary amine contaminants and related

Aromatic secondary amines (Ar-SAs), constituted of several analogues with varied substitutions in molecular structure, are among the most frequently used anthropogenic antioxidants. Despite the reported toxicity effects, little information is available on their environmental contamination, except for few particular congeners such as diphenylamine.

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about antioxidant activity of hindered aliphatic amines and

About antioxidant activity of hindered aliphatic amines and

About antioxidant activity of hindered aliphatic amines and their derivatives to understand polyolefin stabilization at 25°C—I. Overall effects of SEC-hindered aliphatic amines and their nitroxyl derivatives on the kinetics of primary reactions of gamma-radiation-induced autoxidation of 2,4-dimethylpentane in the dark at 25°C compared with effects of a phenolic antioxidant

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overall introduction of polymer antioxidant | baoxu chemical

Overall Introduction of Polymer Antioxidant | Baoxu Chemical

Primary Antioxidant react rapidly and are termed “radical scavengers'”.The most important are sterically hindered phenolics and secondary aromatic amines. Hindered phenolics are high molecular weight anti-oxidants for polymer systems that are sensitive to thermal and oxidative degradation, due to the formation of free radicals and peroxides.

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thioester antioxidants > songnox® dstdp | vanderbilt

Thioester Antioxidants > SONGNOX® DSTDP | Vanderbilt

SONGNOX® DSTDP is a secondary thioester synergistic antioxidant for use during the processing of organic polymers. It decomposes and neutralizes hydroperoxides formed by the auto-oxidation of polymers and is an antioxidant for plastics, rubber, synthetic fiber, fats, oils and petroleum products, as well as an efficient stabilizer for polyolefins, particularly PP and HDPE.

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quantitative analysis of antioxidants from high density

Quantitative Analysis of Antioxidants from High Density

Primary antioxidants perform well without the presence of other additives in their intended application. Hindered phenols and hindered aromatic amines represent two main types of primary antioxidants. Table I lists a few examples of commercially available hindered phenols and hindered amines and some of their structures are shown in Figure 1 (1

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phosphite antioxidants > songnox® 6280 ff | vanderbilt

Phosphite Antioxidants > SONGNOX® 6280 FF | Vanderbilt

Antioxidant. SONGNOX® 6280 is a 90:10 mixture of SONGNOX® 6260 and magnesium aluminum hydroxide carbonate hydrate. It is a secondary antioxidant for organic polymers, being effective in the stabilization of polyolefins, elastomers, engineering plastics and adhesives. It is an excellent discoloration inhibitor, providing excellent color

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charge transfer complexing mechanism of antioxidants. fate of

Charge Transfer Complexing Mechanism of Antioxidants. Fate of

The validity of secondary diamine as antioxidants is interpreted by the results that the complex from secondary diamine reacts further with a second peroxy radical to give two of hydroperoxide and a quinonediimine, while the complex from secondary monoamine and tertiary amine cannot take such a route.

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phenol-phosphite blends > songnox® 417b pw | vanderbilt

Phenol-Phosphite Blends > SONGNOX® 417B PW | Vanderbilt

This product is a 4:1 blend of SONGNOX® 1076, a primary hindered phenolic antioxidant, with SONGNOX® 1680, a secondary phosphite antioxidant.This blend provides excellent melt-flow and color protection to polyolefins during processing, along with long-term heat stability, by protecting physical properties during storage and end-use applications.

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