The antioxidant role of u.v. stabilisers

Scott, Gerald

doi:10.1351/pac198052020365

Cited by 46 publications

(6 citation statements)

References 42 publications

(32 reference statements)

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“…Therefore, the morphological analysis correlates well with the FTIR spectroscopy results shown above and confirmed the UV light stability provided by GA to the bio-HDPE films that can thus improve the shelf life of the green polyolefin. The antioxidant effect of GA is considered to also protect the free residues that are generated during polymer synthesis with improved degradation stability [74]. Indeed, UV stabilizers have always been categorized as a subgroup within the antioxidant additive group.…”

Section: Uv Light Stability Of the Ga-containing Bio-hdpe Filmsmentioning

confidence: 99%

On the Use of Gallic Acid as a Potential Natural Antioxidant and Ultraviolet Light Stabilizer in Cast-Extruded Bio-Based High-Density Polyethylene Films

et al. 2019

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This study originally explores the use of gallic acid (GA) as a natural additive in bio-based high-density polyethylene (bio-HDPE) formulations. Thus, bio-HDPE was first melt-compounded with two different loadings of GA, namely 0.3 and 0.8 parts per hundred resin (phr) of biopolymer, by twin-screw extrusion and thereafter shaped into films using a cast-roll machine. The resultant bio-HDPE films containing GA were characterized in terms of their mechanical, morphological, and thermal performance as well as ultraviolet (UV) light stability to evaluate their potential application in food packaging. The incorporation of 0.3 and 0.8 phr of GA reduced the mechanical ductility and crystallinity of bio-HDPE, but it positively contributed to delaying the onset oxidation temperature (OOT) by 36.5 °C and nearly 44 °C, respectively. Moreover, the oxidation induction time (OIT) of bio-HDPE, measured at 210 °C, was delayed for up to approximately 56 and 240 min, respectively. Furthermore, the UV light stability of the bio-HDPE films was remarkably improved, remaining stable for an exposure time of 10 h even at the lowest GA content. The addition of the natural antioxidant slightly induced a yellow color in the bio-HDPE films and it also reduced their transparency, although a high contact transparency level was maintained. This property can be desirable in some packaging materials for light protection, especially UV radiation, which causes lipid oxidation in food products. Therefore, GA can successfully improve the thermal resistance and UV light stability of green polyolefins and will potentially promote the use of natural additives for sustainable food packaging applications.

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Section: Uv Light Stability Of the Ga-containing Bio-hdpe Filmsmentioning

confidence: 99%

On the Use of Gallic Acid as a Potential Natural Antioxidant and Ultraviolet Light Stabilizer in Cast-Extruded Bio-Based High-Density Polyethylene Films

et al. 2019

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“…Their principal action mode in the degradation processes have been studied and found to act as free-radicals scavenger and hydroperoxide deactivator. 20,21 The film samples were placed in an accelerated aging UVchamber consisting of four UV fluorescent tubes with emission between 280 and 320 nm. All the samples were exposed to UV radiation at same conditions of humidity and at temperature of 40 o C.…”

Section: Methodsmentioning

confidence: 99%

Physicochemical changes in UV- exposed low- density polyethylene films

2002

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Unstabilized low-density polyethylene (LDPE) films and films formulated with hindered amine light stabilizer (HALS) were exposed to UV-radiation; and the physicochemical changes during photooxidation processes have been investigated using tensile, FTIR spectro-photometric and thermal analytical (DSC) techniques. The dependence of tensile properties (elongation-and stress-at-break) , carbonyl index and heat of fusion on UV-irradiation time have been discussed. The use of HALS is found to be effective in maintaining the UV-mechanical properties of the LDPE films. The experimental results showed that there exists no correlation between mechanical properties and carbonyl index, whereas crystallinity correlates well with carbonyl index in unstabilized and stabilized films for irradiation times greater than 100 h. The rate of formation of carbonyl groups is found to be dependent on UV exposure time. Crystallinity of the film samples is strongly influenced by both exposure time and presence of HALS.

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“…It was found by Scott and co-workers [15,16] that aliphatic amine complexes of the zinc dithiocarbamates were about twice as effective as photostabilisers than the parent dithiocarbamates in polypropylene, although the amines alone had little UV stabilising activity. It was found by Scott and co-workers [15,16] that aliphatic amine complexes of the zinc dithiocarbamates were about twice as effective as photostabilisers than the parent dithiocarbamates in polypropylene, although the amines alone had little UV stabilising activity.…”

Section: Synergism Between Photoantioxidants and Antioxidant-inactivementioning

confidence: 99%

Synergism and Antagonism

Scott¹

1993

Atmospheric Oxidation and Antioxidants

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The antioxidant role of u.v. stabilisers

Cited by 46 publications

References 42 publications

On the Use of Gallic Acid as a Potential Natural Antioxidant and Ultraviolet Light Stabilizer in Cast-Extruded Bio-Based High-Density Polyethylene Films

On the Use of Gallic Acid as a Potential Natural Antioxidant and Ultraviolet Light Stabilizer in Cast-Extruded Bio-Based High-Density Polyethylene Films

Physicochemical changes in UV- exposed low- density polyethylene films

Synergism and Antagonism

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