Natural antioxidants for polypropylene stabilization

Ambrogi, Veronica; Cerruti, Pierfrancesco; Carfagna, Cosimo; Malinconico, Mario; Marturano, Valentina; Perrotti, Marta; Persico, Paola

doi:10.1016/j.polymdegradstab.2011.09.015

Cited by 112 publications

(79 citation statements)

References 42 publications

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“…Most of these questions have not been answered yet. As a consequence, more and more attention is paid to the potential use of natural antioxidants for the stabilization of food, but also of polymers [2][3][4][5][6][7][8][9][10]. These compounds usually can be found in vegetables and fruits, are often used as spices and have known beneficial effect on human health.…”

Section: Introductionmentioning

confidence: 99%

Efficient melt stabilization of polyethylene with quercetin, a flavonoid type natural antioxidant

Tátraaljai

Földes

Pukánszky

2014

Polymer Degradation and Stability

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The potential use of quercetin, a flavonoid type natural antioxidant, as a stabilizer in polyethylene was explored in this work. Its efficiency was compared to that of Irganox 1010, a hindered phenolic antioxidant used routinely in industrial practice, both in the presence and the absence of a phosphorous secondary stabilizer. The study was carried out with a Phillips type polyethylene and the efficiency of the additive packages was checked by various methods on samples produced by multiple extrusions. Quercetin content changed from 0 to 1000 ppm in 10 steps. The results showed that quercetin is a very efficient antioxidant. It prevents the formation of long chain branches already at a concentration as small as 50 ppm and its dosage at 250 ppm renders the polymer sufficient long term residual stability. The efficiency of quercetin is considerably better than that of Irganox 1010, the hindered phenolic antioxidant used as reference stabilizer. The difference in efficiency might be explained with the dissimilar number of active -OH groups on the two molecules, but the stabilization mechanism of quercetin may be also different from that of I1010. Quercetin interacts with the phosphonite secondary stabilizer used, which improves dispersion and increases efficiency. Besides its advantages, quercetin has also some drawbacks (very high melting temperature, poor solubility in polyethylene and strong yellow color), which must be overcome before the substance can be used in practice.

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Section: Introductionmentioning

confidence: 99%

Efficient melt stabilization of polyethylene with quercetin, a flavonoid type natural antioxidant

Tátraaljai

Földes

Pukánszky

2014

Polymer Degradation and Stability

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“…Accordingly, the interest is focused more and more on the potential use of natural antioxidants for the stabilisation of polymers [e.g., [2][3][4][5][6][7][8]. The aim of our research was to find natural antioxidants, which can efficiently hinder the degradation of polyethylene during processing without any danger of possible health damage when dissolving from the polymer during application.…”

Section: Introductionmentioning

confidence: 99%

Processing stabilisation of PE with a natural antioxidant, curcumin

Tátraaljai

Kirschweng

Kovács

et al. 2013

European Polymer Journal

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The potential use of natural antioxidants for polyolefin stabilisation came into the centre of attention because of some doubts about the effects of the reaction products of synthetic phenolic antioxidants on human health. The effect of curcumin on the melt stability of polyethylene was investigated in this paper with and without a phosphonite stabiliser by using multiple extrusions. Irganox 1010 was applied as reference phenolic antioxidant.Curcumin was characterised by FT-IR and UV-VIS spectroscopy, as well as by thermal analysis. Its stabilisation efficiency was determined by measuring the chemical structure, the rheological properties, the residual thermo-oxidative stability, and the colour of the polymer.The results reveal that the melt stabilising efficiency of curcumin is superior to that of the synthetic antioxidant investigated and is further enhanced by the addition of the phosphonite secondary antioxidant. The changes in the characteristics of the polymer indicate that besides the phenolic OH groups also the linear linkage between the two methoxyphenyl rings of curcumin participates in the stabilisation reactions.

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“…Regeneration of phenolic compound is essential for effective performance of antioxidant to prevent oxidative thermal degradation. [35,36] The 1 H NMR data of reaction mixture after treatment of aluminum aryloxide with ethanol (used in place of water) indicate the reappearance of peak at 5.04 ppm due to formation phenolic compound. On the basis of above data, the reaction pathway of masking phenolic compounds and their regeneration through hydrolysis for sustaining high activity of catalyst system along with stabilization of resin is proposed as shown in Scheme 2.…”

Section: Resultsmentioning

confidence: 99%

Stabilized polypropylene synthesis using supported titanium catalyst system in presence of phenolic compounds

Kothari

Makwana

Desai

et al. 2014

Designed Monomers and Polymers

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Stabilized polypropylene synthesis is carried out using supported titanium catalyst system in presence of phenols. The effect of phenolic compounds such as 2,2′-methylenebis(4-tert-butyl-6-methylphenol) (PH1) and 4,4′-methylenebis(2,6-di-tert-butylphenol) (PH2) is studied on the productivity and stereospecificity of catalyst system as well as on molecular weight characteristics. The extent of stabilization of PP resin by phenolic compounds for oxidative degradation is determined by measurement of oxygen induction time. Molecular weight and b color change are also investigated before and after thermal aging. The catalyst productivity was found to be unaffected by the concentration of phenolic compounds in the studied range. The thermal stability of the polymer resin is, however, found to be dependent on the nature of phenolic compound. The masked PH1 phenolic compound showed better antioxidant characteristic as compared to PH2.

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Natural antioxidants for polypropylene stabilization

Cited by 112 publications

References 42 publications

Efficient melt stabilization of polyethylene with quercetin, a flavonoid type natural antioxidant

Efficient melt stabilization of polyethylene with quercetin, a flavonoid type natural antioxidant

Processing stabilisation of PE with a natural antioxidant, curcumin

Stabilized polypropylene synthesis using supported titanium catalyst system in presence of phenolic compounds

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