Initiation of nylon 6.6 phototendering by the piperidinoanthraquinones

Allen, Norman S.; Wilson, David; McKellar, J. F.

doi:10.1002/macp.1978.021790128

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…It has been reported that both the PD-C antioxidants (27) and the CB-D antioxidants (56) are antagonistic towards the hindered piperidine uv stabiliser, Tinuvin 770 [IV]. This is illustrated for NIDEC and 770 in Table 7 and Table 3 also shows that the more severe the processing conditions, the more effective is the hindered piperidine es a uv stabiliser.…”

Section: Antagonistic Effectsmentioning

confidence: 91%

The antioxidant role of u.v. stabilisers

Scott¹

1980

Pure and Applied Chemistry

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-The mechantsrns of action of the more important classes of uv stabtltsers for polyoleftns are considered in the light of present views on the mechanisms of antioxidant behaviour.The metal thiolate catalytic peroxide decomposers (PD-C) are seen to be effective uv stabilisers in their own right and as synergtsts with 'uv absorbers' . Chain-breaking antioxidants (CB-A), of which the hindered nttroxyl radicals are the most Important, are very effective as slngle component uv stabilisers but their precursors, the hindered amines, are thermal pro-oxidants . Donor chain-breaking antioxidants (CB-D), as ttfted by the hindered phenols, are weak photostabilisers with only a small concentration gradient . Their radical scavenging effect, Is augmented when they are used In conjunction with the 'uv absorbers ' but they antagonise with the peroxide decomposers. The 'uv absorbers' appear to function at least in part by a CB-D mechanism and their effectiveness is due mainly to their uv stability. They are destroyed by both hydroperoxides and by excited carbonyl chromophores and their synergism with the peroxide decomposers (PD-C) Is to a large extent due to their protection by this class of uv stabiliser.

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Section: Antagonistic Effectsmentioning

confidence: 91%

The antioxidant role of u.v. stabilisers

Scott¹

1980

Pure and Applied Chemistry

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“…Here the presence of the photoactive form, anatase strongly antagonized the stabilization by HALS and the phenolic system. [ 30 ] In fact, the surface activity of the anatase is associated with highly acidic hydroxyl groups which can react unfavorably with the HALS by adsorption and acidity. In the presence of coated rutile pigments the effects were much less antagonistic.…”

Section: Photostabilizersmentioning

confidence: 99%

Perspectives on additives for polymers. Part 2. Aspects of photostabilization and role of fillers and pigments

Allen

Edge

2020

Vinyl Additive Technology

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In Part I of this two‐part series the most important aspects of antioxidants (primary and secondary), processing aids, metal deactivators and some light stabilizers were described and highlighted together with their mechanisms, problems, and interactions. Emphasis was placed on synergism and antagonism in performances and color problems with a special insight regarding PVC. Part 2 of this article presents in a similar way general perspective on the type, mode of action, properties, uses, problems (and circumvention) of light stabilizers and of some important fillers and pigments. Montmorillonites, silica, carbon blacks, and titanium dioxide will be the main features with an emphasis on structure, activity, and formulations in polymer systems. Additive interactions between stabilizers and fillers/pigments is a major controlling factor in the end use performance from a physical, esthetic, structural, mechanical, and chemical point of view. Indeed, with filled polymers one enters an overly complex world of interactions giving rise to some extreme synergistic and often antagonistic problems which can in many cases destroy or even enhance the activity of functional processing additives. Several of these will be highlighted to provide the technologist with at least some experience such that one can be alert to any potential issues in formulating more complex packages where not just color but high performance is also required.

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“…It may, for instance, participate in electron transfer to the photo-excited dye molecules and/or act as a hydrogen donor. Since polyamide is also an electron-donating environment [53], it is believed that from the mechanistic point of view, ethanol will be better than DMF as solvent for predicting photochemical behaviour in this fibre. In addition, solvation plays an important role in the electrochemical experiments.…”

Section: Photochemical Experimentsmentioning

confidence: 99%

Electrochemical and photochemical reduction of a series of azobenzene dyes in protic and aprotic solvents

Sokołowska

Marcinek²,

Zielonka³

et al. 2003

Coloration Technology

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The electrochemical and photochemical reduction in ethanol of a series of azobenzene dyes containing tertiary amine groups has been investigated. It has been shown that the two mechanisms are of parallel importance and an explanation suggested using quantum chemical calculations (AM1, DFT). The solvation of these dyes in protic (methanol) and aprotic (dimethylformamide) solvents has also been studied and the effect of solvation on their electrochemical and photochemical reduction is discussed.

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Initiation of nylon 6.6 phototendering by the piperidinoanthraquinones

Cited by 13 publications

References 5 publications

The antioxidant role of u.v. stabilisers

The antioxidant role of u.v. stabilisers

Perspectives on additives for polymers. Part 2. Aspects of photostabilization and role of fillers and pigments

Electrochemical and photochemical reduction of a series of azobenzene dyes in protic and aprotic solvents

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