Glucoside/(UV absorber) mixtures as photostabilizers for rigid PVC

Rabie, Samira T.; Nada, A. A.

doi:10.1002/vnl.20143

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…The PVC films prepared by molding method having a concentration of 2% by weight of UV-absorbers or glucosides in the solvent of tetrahydrofuran. The mixtures exhibited photo-stabilizing effects by decreased rates of de-hydro-chlorination and decreased weight loss [25].…”

Section: Fig(8): Absorption Of Uv Light Process By Benzophenonesmentioning

confidence: 99%

The Trend of Additives for Poly(vinyl chloride) as Photostabilizers: Article Review

Mohammed¹,

Majeed²,

Yousif³

et al. 2019

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Conservation of poly(vinyl chloride) from the ultraviolet light that causes degradation, have very attention in recent decades. PVC formularizations have a large number of additives playing fundamental functions during their conversion and adjusting the behavior properties of final products. In this review, various types of additives are briefly discussed to show their important properties and reasons for addition to their essential mechanisms that cause retardation of photodegradation. The additives including organotin(IV), UV screeners, organic UV absorber and freeradical scavengers.

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Section: Fig(8): Absorption Of Uv Light Process By Benzophenonesmentioning

confidence: 99%

The Trend of Additives for Poly(vinyl chloride) as Photostabilizers: Article Review

Mohammed¹,

Majeed²,

Yousif³

et al. 2019

ANJS

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“…The UV absorber Chimassorb 81 works by absorbing harmful ultraviolet irradiation and then harmlessly dissipating the energy in the form of heat, as in Eq. 4 [8,9]. When organic calcium complex stabilizers are added to PVC individually to inhibit photodegradation, they can act by substituting active chloride as well as by scavenging HCl, which has an autocatalytic effect in the presence of oxygen [24][25][26].…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

“…However, for flexible PVC, especially transparent products, UV absorbers are typically added to protect the material from discoloring as well as surface cracking during long-term exposure to sunlight [6]. The UV absorbers include a comprehensive range of compound types, but the ones most commonly used in industry are the benzophenone and benzotriazole classes, which work by absorbing most of the incident UV radiation and then dissipating the energy in a nondestructive form [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of the combination of a benzophenone‐type ultraviolet absorber with thermal stabilizers on the photodegradation of poly(vinyl chloride)

Xiang

Chai

Chen

et al. 2010

Vinyl Additive Technology

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The effect of the combination of a UV absorber (Chimassorb 81) with different types of thermal stabilizers, including an organic calcium complex and an organotin mercaptide, on the photodegradation of poly(vinyl chloride) (PVC) was investigated by color difference measurements, UV-Vis spectroscopy, Fourier-transform infrared spectroscopy, thermogravimetric (TG) analysis, and viscosity-average molecular weight determination. Films of PVC containing 0.5 phr of Chimassorb 81, with and without 2 phr of a thermal stabilizer, were prepared by solution casting. Then the accelerated UV weathering of the films was carried out under xenon light with an irradiance of 0.51 W/(m 2 Á nm) at 658C. The results showed that both Chimassorb 81 and the mixture of Chimassorb 81 with the organic calcium complex showed good behavior in inhibiting the photodehydrochlorination and photooxidation of PVC. In contrast, the combination of Chimassorb 81 and methyltin mercaptide significantly accelerated initial color development during the final 200 h of exposure because of the UV sensitivity of the organotin. Moreover, when Chimassorb 81 and the methyltin mercaptide were used together to stabilize PVC films, the expected antioxidant effect of the mixture was not observed, in contrast to the behavior found with other stabilized systems, perhaps because the Chimassorb 81 had been depleted by the methyltin mercaptide during the UV irradiation. The TG analysis revealed that ultraviolet irradiation had caused severe destruction of the PVC chains. However, addition of Chimassorb 81 or the combination of Chimassorb 81 with the organic calcium complex effectively prevented the destruction, as was demonstrated by changes in the activation energies for thermal degradation.

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“…Glucosides of UV absorbers and their mixtures with the parent absorbers exhibited a better stabilizing efficiency due to the presence of the multiple hydroxyl groups of the pyranoze ring that acted as costabilizers in the first case [15] or to synergism that occurred in the second case [16].…”

Section: Introductionmentioning

confidence: 97%

Diamide derivatives as photostabilizers for plasticized poly(vinyl chloride)

Rabie

Khalil

Nada

2008

Vinyl Additive Technology

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Some diamide derivatives have been prepared, characterized, and investigated as photostabilizers for plasticized poly(vinyl chloride) (PVC), containing dioctyl phthalate and dibutyl phthalate in a concentration of 30% by weight of the polymer. The stabilizing efficiency of the prepared diamides was evaluated by determining the weight loss percentage that resulted from HCl evolution during the photodegradation process. Moreover, the efficiency was evaluated by determining the amount of gel formed as well as the intrinsic viscosity of the soluble fractions of the photodegraded polymer. The extent of discoloration of the photodegraded stabilized and plasticized PVC was also investigated. The stabilization mechanism and the effect of plasticizers on the photostability of PVC are discussed.

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Glucoside/(UV absorber) mixtures as photostabilizers for rigid PVC

Cited by 9 publications

References 9 publications

The Trend of Additives for Poly(vinyl chloride) as Photostabilizers: Article Review

The Trend of Additives for Poly(vinyl chloride) as Photostabilizers: Article Review

Effect of the combination of a benzophenone‐type ultraviolet absorber with thermal stabilizers on the photodegradation of poly(vinyl chloride)

Diamide derivatives as photostabilizers for plasticized poly(vinyl chloride)

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