Chloe Zhang
Benzoyl peroxide is a typical organic peroxide widely used in food processing, especially for bleaching flour. It is also used in the production of plastics, as a bleaching agent for hair and textiles, and as a medication for treating acne. In plastic processes, some organic peroxides (OPs) are used as initiators in polymerization processes, and benzoyl peroxide is one such OP. It is used in the polymerization of styrene, acrylate, and methacrylate. It is also used in the polymerization of polyester and poly(methyl methacrylate) (PMMA) resins, dental cements, and restoratives. The clear, colourless plastic Lucite or Plexiglas is made by polymerization of the vinyl ester methyl methacrylate, with benzoyl peroxide used to initiate a free radical chain polymerization of the monomer.
| Characteristics | Values |
|---|---|
| Plastic materials that react with benzoyl peroxide | Polyethylene, polystyrene, polyester, poly(methyl methacrylate) (PMMA) resins, acrylonitrile-butadiene-styrene (ABS), allyl methacrylate (AMA) copolymers |
| Main uses | Production of plastics, bleaching flour, hair, plastics, textiles, and teeth whitening, medication, water disinfectant, acne treatment |
| Side effects | Redness, burning, irritation, phototoxicity under UVB light, hypersensitivity in 1 in 500 people |
| Safety considerations | Potential for explosions due to unstable thermal properties, history of accidents in petrochemical plants, potential skin irritation |
| Thermal properties | Mid-low-temperature conditions can initiate reactions, half-life of one hour at 92°C, half-life of one minute at 131°C |
| Polymerization | Benzoyl peroxide is a radical initiator for chain-growth polymerization, activated by light or heat, forming free radicals |
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What You'll Learn
Benzoyl peroxide is used in the production of plastics
Benzoyl peroxide (BPO) is a typical organic peroxide with a range of applications, including in the production of plastics. It is used as a radical initiator to induce chain-growth polymerization reactions, such as for polyester and poly(methyl methacrylate) (PMMA) resins and dental cements and restoratives.
In plastic production, BPO is used as an initiator to conduct polymerization between monomers. The peroxy bond (OO) in BPO breaks, releasing a free radical that combines with monomers to cause polymerization. BPO is particularly useful in these processes due to its ability to promote the efficiency of polymerization.
BPO is also used in the production of acrylonitrile-butadiene-styrene (ABS) and allyl methacrylate (AMA) copolymers. It is often preferred in these processes due to its relatively low toxicity compared to other organic peroxides.
Additionally, BPO is used in rubber curing and as a finishing agent for some acetate yarns. It is also used in dentistry for teeth whitening and as a bleaching agent for flour, hair, and textiles.
While BPO has a variety of applications, it is important to note that it has unstable thermal properties and a weak oxygen-oxygen bond, which can lead to potential hazards in industrial settings, particularly relating to fire and explosion. Therefore, careful handling and safety measures are crucial when working with BPO in plastic production and other industrial processes.
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It is a polymerization initiator
Benzoyl peroxide (BPO) is a typical organic peroxide widely used in food processing, particularly for flour bleaching. It is also used in the production of plastics and for bleaching hair, textiles, and as a medication for acne.
BPO is one of the primary organic peroxides (OPs) used as an initiator, curing agent, or medicine. It is the most important of the various organic peroxides used for this purpose, and it is a relatively safe alternative to the much more hazardous methyl ethyl ketone peroxide.
In plastic processes, some OPs are used as initiators in the processes to conduct polymerization between monomers. These OPs can promote the efficiency of polymerization, and the mechanism of the entire reaction is based on the OP peroxy bond (OO) being broken. Then, the free radical releases, and the monomers combine with free radicals to cause polymerization.
BPO is used in the polymerization of styrene, acrylate, and methacrylate. It is also used in rubber curing and as a finishing agent for some acetate yarns.
BPO is also used in dentistry for teeth whitening. It was the 284th most commonly prescribed medication in the United States in 2021, with over 700,000 prescriptions.
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It is used as a curing agent
Benzoyl peroxide (BPO) is a typical organic peroxide with a range of applications. It is widely used in food processing, particularly for bleaching flour. It is also used as a medication and a water disinfectant.
In the context of plastics, BPO is primarily employed as a curing agent in the manufacture of polyester resins used in fiberglass-reinforced plastics (FRP) and other composite materials. It initiates the curing process, converting liquid resins into solid, durable materials.
BPO is also used as a radical initiator in the polymerization process of plastics, acting as a catalyst to facilitate the formation of polymers by initiating chemical reactions that link monomers together. This improves the efficiency of polymerization and enhances the mechanical and thermal properties of the final plastic products.
In addition to its role as a curing and polymerization agent, BPO is used in the production of plastics for its bleaching properties. It helps achieve efficient and environmentally friendly bleaching effects on plastics and other materials such as textiles and paper.
While BPO has a range of valuable applications, it is important to note that it has unstable thermal properties due to its peroxy bond (OO). This instability has led to accidents in petrochemical plants, particularly those related to fire and explosion. Therefore, understanding and controlling the thermal behaviour of BPO are critical aspects of its safe utilization in industrial processes, including its role as a curing agent in plastic production.
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It is used as a bleaching agent
Benzoyl peroxide (BPO) is a typical organic peroxide widely used in food processing, particularly as a flour bleaching agent. It is also used in acne drugs, acrylonitrile-butadiene-styrene (ABS) and allyl methacrylate (AMA) copolymers, and as an initiator in plastic polymerization processes.
Due to the unstable nature of the oxygen-oxygen bond in BPO, it readily reacts under even mid-low-temperature conditions. BPO is also used as a bleaching agent in skincare products to treat acne. Its ability to clear breakouts, reduce inflammation, and prevent future flare-ups makes it a go-to for many skincare enthusiasts. However, it is notorious for bleaching fabrics, including clothing, sheets, and towels.
To avoid bleaching fabrics, it is recommended to use white sheets, pillowcases, and towels, or switch to stain-resistant fabrics. Applying benzoyl peroxide before bed can also help, as it reduces the risk of bleaching clothing. Using a benzoyl peroxide wash in the shower is another effective method, as it can be rinsed off easily.
Additionally, wearing white clothing or an old white t-shirt under other garments while applying benzoyl peroxide can help prevent accidental bleaching. It is also important to keep benzoyl peroxide creams in a cool, dry place, below 70°F/20°C, to maintain their potency and avoid heat, moisture, and direct sunlight, which may affect their stability.
While BPO is a valuable bleaching agent, it has unstable thermal properties and a peroxy bond (OO), which has led to accidents involving fires and explosions in petrochemical plants. Therefore, understanding its thermal behaviour and improving thermal safety in chemical processes involving BPO are critical to preventing such accidents.
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It is used to treat acne
Benzoyl peroxide is a common ingredient in over-the-counter (OTC) acne gels, cleansers, and spot treatments. It is also available in prescription medications. It is an antimicrobial that helps reduce acne-causing bacteria on the skin. It also helps keep pores clear from blockages by removing excess oil and dead skin cells.
It is important to select the right benzoyl peroxide product for your skin type and preferences. For example, you may prefer to use a wash specifically formulated for the body or face. Another key consideration is choosing the appropriate concentration. Benzoyl peroxide is available in 2.5%, 4%, 5%, and 10% strengths. The face is rather sensitive, so many choose to use a lower concentration in that area, while the chest and back can tolerate a higher concentration.
Topical benzoyl peroxide gels and creams are typically more potent. They can be applied directly to individual pimples or used all over. After washing and drying your skin, apply a thin layer of cream or gel to the desired treatment area. Allow the treatment to soak in for several minutes. If the medication is still visible after 30 minutes, you can gently wipe off the excess with a damp cloth.
Benzoyl peroxide can cause dryness, peeling, flaking, redness, burning, and itching. These are normal reactions. However, if you experience swelling, severe redness, blisters, or incredibly irritated skin, you may have an allergy. Stop using the product and contact your healthcare provider. Benzoyl peroxide can also increase your sensitivity to the sun, so it is important to wear protective clothing and sunscreen when going outdoors.
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Frequently asked questions
Benzoyl peroxide (BPO) is a typical organic peroxide widely used in food processing, particularly for flour bleaching. It is also used in medicine, dentistry, and the production of plastics.
Benzoyl peroxide is used as an initiator in plastic polymerization processes. It is activated by light to form a free radical or an ion radical, which starts a chain reaction of polymerization.
Benzoyl peroxide is used in the production of polyester and poly(methyl methacrylate) (PMMA) resins, dental cements, and restoratives. It is also used in rubber curing and as a finishing agent for some acetate yarns.
Yes, there have been accidents involving BPO in petrochemical plants, especially fires and explosions due to its unstable thermal properties and peroxy bond. BPO can also cause skin irritation and redness, burning, and itching in some individuals.
