natural antioxidants as stabilizers for polymers-sciencedirect
Natural antioxidants as stabilizers for polymers
Polymeric polyphenols, including lignin and tannin, also have some antioxidant effect, but because of the small molar value of phenolic hydroxyl groups their efficiency is smaller than that of the flavonoids or even the commercial stabilizers used today. Natural antioxidants interact with each other and with the secondary stabilizer added simultaneously.
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Natural antioxidants as melt stabilizers for PE
The comparison of two natural antioxidants, silymarin and quercetin used as reference showed that silymarin is a much less efficient stabilizer in polyethylene than quercetin. The consumption of vinyl groups is faster and melt flow rate as well as residual stability is smaller in its presence.
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Melt stabilization of PE with natural antioxidants
Quercetin, a natural antioxidant, was explored as possible stabilizer both in food and in polymers , and most of the results obtained confirmed its efficiency indeed. Dihydromyricetin, another flavonoid was also studied as stabilizer in both PE and PP and proved more efficient than the commercial stabilizers used as reference [18] , [19] .
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Natural antioxidants as stabilizers for polymers
title = "Natural antioxidants as stabilizers for polymers", abstract = "The additive packages routinely used today usually consist of a phenolic antioxidant and a phosphorus or sulfur containing secondary stabilizer.
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Natural antioxidants as stabilizers for polymers | Request PDF
Request | Natural antioxidants as stabilizers for polymers | The additive packages routinely used today usually consist of a phenolic antioxidant and a phosphorus or sulfur containing ...
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Direct Use of Natural Antioxidant-rich Agro-wastes as
Antioxidant-rich agro-wastes such as grape pomace waste (GW), turmeric shavings and waste, coffee grounds, and orange peel waste are used as-received for the first time as thermo-oxidative stabilizers for polymer.
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Natural antioxidants for polypropylene stabilization
Secondary antioxidants, typically sulfur- or phosphorous-based compounds, decompose peroxides that are intermediate products in the oxidation reactions, and can regenerate the primary antioxidant. Natural primary antioxidants have been extracted from hazelnuts , chestnuts , and especially grape seeds , ; the chemical components of these extracts are phenolic compounds, such as tannins, tocopherols, and flavonoids .
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Volatility and compatibility of stabilizers in polymers
The process of volatilization of the stabilizer from the polymer include two stages: diffusion from the polymer mass onto the surface and volatilization Volatility and compatibility of stabilizers in polymers 2161 from the surface.
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Natural Antioxidants in Foods and Medicinal Plants
Besides, the industries processing agricultural by-products are also potentially important sources of natural antioxidants . These natural antioxidants from plant materials are mainly polyphenols (phenolic acids, flavonoids, anthocyanins, lignans and stilbenes), carotenoids (xanthophylls and carotenes) and vitamins (vitamin E and C) [6,20].
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Natural antioxidants as stabilizers of frying oils
Synthetic antioxidants such as butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), and tertâbutylhydroquinone (TBHQ) are often added to processed oils to retard oxidative degradation during storage and frying; however, beside their poor performance under frying conditions, consumers' acceptance of synthetic antioxidants remains negative due to their perceived detrimental effect on human health. Consequently, there is a growing interest in the search for effective natural ...
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Natural antioxidants as stabilizers for polymers
Natural antioxidants as stabilizers for polymers. 2.1. Classification, source. Natural antioxidants (AO) can be divided into two main groups, namely enzymatic and non-enzymatic antioxidants [21 2.2. Carotenoids. 2.3. Vegetable oils. 2.4. Natural polyphenols.
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Natural antioxidants as melt stabilizers for PE
The comparison of two natural antioxidants, silymarin and quercetin used as reference showed that silymarin is a much less efficient stabilizer in polyethylene than quercetin. The consumption of vinyl groups is faster and melt flow rate as well as residual stability is smaller in its presence.
Send Inquiry
Melt stabilization of PE with natural antioxidants
Quercetin, a natural antioxidant, was explored as possible stabilizer both in food and in polymers , and most of the results obtained confirmed its efficiency indeed. Dihydromyricetin, another flavonoid was also studied as stabilizer in both PE and PP and proved more efficient than the commercial stabilizers used as reference [18] , [19] .
Send Inquiry
Natural antioxidants as stabilizers for polymers
title = "Natural antioxidants as stabilizers for polymers", abstract = "The additive packages routinely used today usually consist of a phenolic antioxidant and a phosphorus or sulfur containing secondary stabilizer.
Send Inquiry
Natural antioxidants as stabilizers for polymers | Request PDF
Request | Natural antioxidants as stabilizers for polymers | The additive packages routinely used today usually consist of a phenolic antioxidant and a phosphorus or sulfur containing
Send Inquiry
Direct Use of Natural Antioxidant-rich Agro-wastes as
Antioxidant-rich agro-wastes such as grape pomace waste (GW), turmeric shavings and waste, coffee grounds, and orange peel waste are used as-received for the first time as thermo-oxidative stabilizers for polymer.
Send Inquiry
Natural antioxidants for polypropylene stabilization
Secondary antioxidants, typically sulfur- or phosphorous-based compounds, decompose peroxides that are intermediate products in the oxidation reactions, and can regenerate the primary antioxidant. Natural primary antioxidants have been extracted from hazelnuts , chestnuts , and especially grape seeds , ; the chemical components of these extracts are phenolic compounds, such as tannins, tocopherols, and flavonoids .
Send InquiryVolatility and compatibility of stabilizers in polymers
The process of volatilization of the stabilizer from the polymer include two stages: diffusion from the polymer mass onto the surface and volatilization Volatility and compatibility of stabilizers in polymers 2161 from the surface.
Send Inquiry