Effect of Metal Acetylacetonates on the Photooxidative Destruction of High Density Polyethylene

Kiryakova, Dimitrina; Mihaleva, S.; Atanassov, Atanas

doi:10.1590/1980-5373-mr-2015-0516

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Table 1 presents the overall relative reactivity of different metal compounds in different media, phases, and conditions (light or the absence of light). It is worth noting that, as revealed by Kiryakova et al [56], PE has the highest extent of photo-oxidation corresponding to manganese(II) and cobalt(III) acetylacetonates, whereas, for PP, vanady(II) and iron(III) acetylacetonates had the most pronounced effect.…”

Section: Comparison Of Metals As Oxidation Catalyzers: Uv Accelerationmentioning

confidence: 84%

Oxo-Additives for Polyolefin Degradation: Kinetics and Mechanism

2023

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This review considers the recent investigations in the scope of biodegradability of synthetic polymers, spanning polyethylene (PE), polypropylene (PP), and their corresponding composites, with a focus on the influence of oxo-additives (mostly transition metal salts). The types of oxo-additives and the mechanisms of oxidation acceleration are discussed. Furthermore, the influence of oxo-additives on both physicochemical and biological stages of degradation is evaluated (laboratory and field experiments with microorganisms/fungi action) with recent standards suggested for degradation estimation. Comparisons of the metal salts are given with respect to catalysis, as well as the synergetic influence of additives. The additives presented on the commercial market are also discussed.

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Section: Comparison Of Metals As Oxidation Catalyzers: Uv Accelerationmentioning

confidence: 84%

Oxo-Additives for Polyolefin Degradation: Kinetics and Mechanism

2023

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“…Titanium acetylacetonate restricted losses in weight and tensile strength of thin radiata pine (Pinus radiata D. Don) veneers exposed to natural weathering [9], but the effectiveness of other acetylacetonates at photostabilizing 2 of 13 wood has not been tested. In contrast, much more research has been carried out on the photoprotection of polymers with different metal acetylacetonates [12,13]. These studies have found that the effectiveness of metal acetylacetonates as photostabilizers for polymers varies with type of acetylacetonate and polymer species.…”

Section: Introductionmentioning

confidence: 99%

Surface Protection of Wood with Metal Acetylacetonates

Zhu

Evans

2021

Coatings

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Metal acetylacetonates are coordination complexes of metal ions and the acetylacetonate anion with diverse uses including catalysts, cross-linking agents and adhesion promotors. Some metal acetylacetonates can photostabilize polymers whereas others are photocatalysts. We hypothesize that the ability of metal acetylacetonates to photostabilize wood will vary depending on the metal in the coordination complex. We test this hypothesis by treating yellow cedar veneers with different acetylacetonates (Co, Cr, Fe, Mn, Ni, and Ti), exposing veneers to natural weathering in Australia, and measuring changes in properties of treated veneers. The most effective treatments were also tested on yellow cedar panels exposed to the weather in Vancouver, Canada. Nickel, manganese, and titanium acetylacetonates were able to restrict weight and tensile strength losses and delignification of wood veneers during natural weathering. Titanium acetylacetonate was as effective as a reactive UV absorber at reducing the greying of panels exposed to 6 months of natural weathering, and both titanium and manganese acetylacetonates reduced the photo-discoloration of panels finished with a polyurethane coating. We conclude that the effectiveness of metal acetylacetonates at photostabilizing wood varies depending on the metal in the coordination complex, and titanium and manganese acetylacetonate show promise as photoprotective primers for wood.

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“…Na literatura, há estudos que relatam o comportamento da degradação do polietileno com aditivos oxibiodegradantes que possuem metais pesados na sua composição como, por exemplo, Manganês (ABRUSCI et al, 2013;KIRYAKOVA et al, 2016;BENÍTEZ et al, 2013;KONDURI et al, 2011;MARYUDI et al, 2012;MARYUDI et al, 2013;JAKUBOWICZ et al, 2011), Cobalto (ABRUSCI et al, 2013KIRYAKOVA et al, 2016;SAMAL et al, 2014;KONDURI et al, 2011;FOCKE et al, 2011), Titânio (YANG et al, 2006MANANGAN et al, 2010;KONDURI et al, 2011), Cobre (FOCKE et al, 2011, entre outros.…”

Section: Introductionunclassified