Synthesis of new polymeric hindered amine light stabilizers: Performance evaluation in styrenic polymers

Singh, R. P.; Patwa, Amit; Desai, Shrojal M.; Pandey, Jitendra; Solanky, S. S.; Prasad, A. R.

doi:10.1002/app.12672

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…63 In specialized applications where brightening is important, as in textile or paper substrates, the additive may have considerable advantages over conventional technology. Singh et al 64 reported the synthesis of a novel HALS-type polymeric stabilizer and demonstrated its effectiveness on high-impact polystyrene to be superior to that of conventional light stabilizers. This improvement is likely a result of reduced leaching of stabilizer from the matrix.…”

Section: Recent Developments In Halsmentioning

confidence: 99%

Effects of stratospheric ozone depletion and climate change on materials damage

Andrady

Hamid

Torikai³

2007

Photochem Photobiol Sci

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Nanoscale inorganic fillers with average particle sizes smaller by an order of magnitude or more compared to those of conventional fillers are becoming commercially available. The efficacy of these fillers used in polymer formulations and particularly their effect as photostabilizers are beginning to be investigated. These may enhance or retard photodegradation depending on the surface coating of the particles or their chemical nature. Some recent data indicate their use as effective photostabilizers in some common polymers. However, the potential deleterious interaction of the nanoscale fillers with other additives in the formulation has also been pointed out. Depending on the efficiency of stabilization and the economics of their use nanofillers may provide a useful route to UV-stabilization of plastics and rubber used outdoors. Insufficient data are available at this time to assess their potential impact on material and coatings stabilization. Organic fillers such as lignocellulose continue to be investigated for outdoor applications. Their cost advantage makes them attractive despite the somewhat reduced engineering properties of their composites. Recent reports, however, suggest the photostability of these composites to depend on the source of fiber as well as the processing techniques employed in fabricating products from them. Identification of the key determinants in terms of species, isolation and processing of polymer-wood composites is critical to developing them for long-term outdoor use. Efforts are continuing on the synthesis of new light stabilizers, particularly those based on a hindered amine light stabilizers (HALS), and on identifying synergistic combinations of known stabilizers for common thermoplastics. Variants of HALS-type stabilizers that reduce the loss of stabilizer via leaching or migration were recently reported. Studies on the permanence of the stabilizers themselves when exposed to solar UV wavelengths have also been reported in recent work. Identification of relevant mechanisms is important not only to understand the interactions of climate changes and higher UV solar environments with materials damage, but also to guide future design of light-stabilizers.

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Section: Recent Developments In Halsmentioning

confidence: 99%

Effects of stratospheric ozone depletion and climate change on materials damage

Andrady

Hamid

Torikai³

2007

Photochem Photobiol Sci

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“…The synthesis of HALS of higher molecular weight by addition or condensation copolymerizations [9][10][11] or the grafting of photostabilizers onto the preformed polymer [12][13][14][15][16] are usual strategies described by the literature to eliminate or minimize such undesirable effects. The preparation of polymeric HALS by the copolymerization of hindered amines with ethylene or propylene is also an alternative route to reduce their physical loss [17,18] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photostabilizing performance of a polymeric HALS based on 1,2,2,6,6-pentamethylpiperidine and vinyl acetate

2015

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“…Besides substantially reducing the HALS efficiency and therefore the product's lifespan, physical loss can cause serious toxicity problems. The synthesis of polymeric HALS, with optimal molecular weight and molecular architecture more compatible with different polymeric matrix has been an important alternative to achieve a long-term stabilizing effect and minimize the physical loss of HALS [18][19][20] . Polymeric HALS can be prepared by the copolymerization of vinyl monomers containing HALS group or macromolecular functional reaction [21,22] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Copolymers from Hindered Amines and Vinyl Monomers

Chinelatto¹,

Agnelli²,

Canevarolo³

2014

Polímeros

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New copolymers from hindered amines and vinyl monomers were synthesized by radical chain polymerization. To obtain polymeric HALS, acrylamide-(1ATP) and acrylate-(4ATP) monomers, derivatives from 2,2,6,6-tetramethylpiperidine and 2,2,6,6-tetramethyl-4-piperidinol were synthesized. The radical chain polymerization of 1ATP with styrene (Sty) using 1-butanethiol (BTN) resulted in a copolymer with 95 units of Sty and 15 units of 1ATP. The radical chain polymerization of 1ATP and vinyl acetate (VAc) has produced only 1ATP homopolymer. In the chain polymerization of 4ATP with Sty or VAc, the hydrogen atom bonded to the nitrogen of 4ATP is labile enough to originate another radical at this site. The steric hindrance imposed by methyl groups on this bonding site hampers its reaction with other propagating species and the formation of a copolymer or network structure will be dependent on the size of the pendent group in the vinyl monomer.

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Synthesis of new polymeric hindered amine light stabilizers: Performance evaluation in styrenic polymers

Cited by 15 publications

References 19 publications

Effects of stratospheric ozone depletion and climate change on materials damage

Effects of stratospheric ozone depletion and climate change on materials damage

Synthesis and photostabilizing performance of a polymeric HALS based on 1,2,2,6,6-pentamethylpiperidine and vinyl acetate

Synthesis and Characterization of Copolymers from Hindered Amines and Vinyl Monomers

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