polymer additives primary and secondary antioxidants
Polymer Additives - Primary and Secondary Antioxidants
Polymer Additives - Primary and Secondary Antioxidants. Practically all polymer materials undergo oxidative degradation reactions occurring at one or all of the manufacturing, processing and end-use stages.
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Secondary Antioxidant - an overview | ScienceDirect Topics
Phosphites, and in particular organophosphorus compounds, are secondary antioxidants that decompose peroxides and hydroperoxides into stable, nonradical products, according to Scheme 4.4.They are extremely effective stabilizers during processing and are normally used in combination with a primary antioxidant. Trivalent phosphorus compounds are excellent hydroperoxide decomposers.
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Primary Antioxidants: Antioxidants Selection for Adhesives
Phenolic stabilizers are primary antioxidants that act as hydrogen donors. They react with peroxy radicals to form hydroperoxides and prevent the abstraction of hydrogen from the polymer backbone. Often used in combination with secondary antioxidants, phenolic stabilizers are offered in an extensive range of molecular weights, product forms, and functionalities.
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BASF Antioxidant - Polymer Additives
Phosphites are most effective during processing and protect both the polymer and the primary antioxidant. Hydrolytically stable phosphites are the most frequently used processing stabilizers in high-performance additive systems. Thioethers are useful only in increasing the long-term thermal stability in conjunction with phenolic antioxidants. The use of thioethers is limited to areas where ...
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Antioxidants | Additives for polymers | ADEKA Polymer
ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. Jump to navigation ...
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Antioxidants - CROW
Antioxidants. Polymers will change over time when exposed to radiation, excessive heat and/or corrosive enviroments. These changes are the result of oxidative degradation caused by free radicals which form through hydrogen abstration or homolytic scission of carbon-carbon bonds when polymers are exposed to heat, oxygen, ozone, or light.
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INTRODUCTION TO POLYMER ADDITIVES AND STABILIZATION
– Primary and secondary antioxidants • Additives can also impart particular properties or effects to a polymer system ¾Colorants ¾Photoinitiators ¾Antistats ¾Antimicrobials • Many additives will transform and/or degrade during use. ¾Each of these products must be taken into consideration when evaluating leachables and extractables.
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Use of Antioxidant Masterbatch for Polymer Stabilization
Secondary – used as a process stabilizer. This type of stabilization is an effective way to protect the polymer during processing, especially when the polymer undergoes multiple heat histories. Typical chemistries employed include phosphites or thioesters. Primary/Secondary Combination – Both primary and secondary antioxidants are often ...
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Antioxidants | Thermal Protection for Plastics | amfine.com
Primary antioxidants, ... Blends of primary and secondary antioxidants often show a synergistic performance superior to either type of antioxidant used alone. For example, blends of hindered phenols and phosphites represent the state-of-the-art for the melt process stabilization of many plastics. ... Special additives known as metal ...
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Polymer stabilizers
Light stabilizer are used to inhibit polymer photo-oxidation, which is the combined result of the action of light and oxygen.Like autoxidation this is a free radical process, hence the antioxidants described above are effective inhibiting agents, however additional classes of additives are also beneficial, such as UV absorbers, quenchers of excited states and HALS.
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Polymer Additives - Primary and Secondary Antioxidants
Polymer Additives - Primary and Secondary Antioxidants. Practically all polymer materials undergo oxidative degradation reactions occurring at one or all of the manufacturing, processing and end-use stages. Antioxidants are highly effective in preventing this degradation to the extent that color development, physical and mechanical property loss is kept within acceptable limits.
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Secondary Antioxidant - an overview | ScienceDirect Topics
Phosphites, and in particular organophosphorus compounds, are secondary antioxidants that decompose peroxides and hydroperoxides into stable, nonradical products, according to Scheme 4.4.They are extremely effective stabilizers during processing and are normally used in combination with a primary antioxidant. Trivalent phosphorus compounds are excellent hydroperoxide decomposers.
Send Inquiry
Primary Antioxidants: Antioxidants Selection for Adhesives
Phenolic stabilizers are primary antioxidants that act as hydrogen donors. They react with peroxy radicals to form hydroperoxides and prevent the abstraction of hydrogen from the polymer backbone. Often used in combination with secondary antioxidants, phenolic stabilizers are offered in an extensive range of molecular weights, product forms, and functionalities.
Send Inquiry
BASF Antioxidant - Polymer Additives
Phosphites are most effective during processing and protect both the polymer and the primary antioxidant. Hydrolytically stable phosphites are the most frequently used processing stabilizers in high-performance additive systems. Thioethers are useful only in increasing the long-term thermal stability in conjunction with phenolic antioxidants. The use of thioethers is limited to areas where
Send InquiryAntioxidants | Additives for polymers | ADEKA Polymer
ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. ADEKA Polymer Additives Europe offers a full range of solid and liquid primary and secondary antioxidants. Jump to navigation
Send Inquiry
Antioxidants - CROW
Antioxidants. Polymers will change over time when exposed to radiation, excessive heat and/or corrosive enviroments. These changes are the result of oxidative degradation caused by free radicals which form through hydrogen abstration or homolytic scission of carbon-carbon bonds when polymers are exposed to heat, oxygen, ozone, or light.
Send Inquiry
INTRODUCTION TO POLYMER ADDITIVES AND STABILIZATION
– Primary and secondary antioxidants • Additives can also impart particular properties or effects to a polymer system ¾Colorants ¾Photoinitiators ¾Antistats ¾Antimicrobials • Many additives will transform and/or degrade during use. ¾Each of these products must be taken into consideration when evaluating leachables and extractables.
Send Inquiry
Antioxidants | Thermal Protection for Plastics | amfine.com
Primary antioxidants, Blends of primary and secondary antioxidants often show a synergistic performance superior to either type of antioxidant used alone. For example, blends of hindered phenols and phosphites represent the state-of-the-art for the melt process stabilization of many plastics. Special additives known as metal
Send Inquiry