Peroxides benzoyl peroxide

Silicone rubbers are normally cured with peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and t-butyl perbenzoate being used for the dimethyl-silicones in quantities of 0.5-3%. These materials are stable in the compounds for several months at room temperature but will start to cure at about 70°C. 

Diacyl peroxides exhibit behavior somewhat like that of the dialkyl peroxides. Benzoyl, peroxide decomposes into radicals partly by a unimolecular and partly by a chain mechanism. In at least the case of benzoyl peroxide itself, if not for similar compounds, the first step is the production of benzoyloxy radicals rather than phenyl radicals and... 

Caution This reaction should he carried out behind a safety screen. The solvent removal and product distillation steps should also he carried out behind a screen to minimize trouble if the product is contaminated with undetected peroxides. Benzoyl peroxide should be handled with caution because it is impact-sensitive. 

DIBENZOYL PEROXIDE Benzoyl Peroxide, Benzoyl Superoxide, BPO, Oxilite Organic Peroxide 1 4 4 oxy... 

Several other processes have been developed, however, to accomplish the oxidative decarboxylation of carboxylic acids oxidation by Pb(OAc)4, by iodosobenzene-diacetate, and by Ag(II) salt generated in situ in a catalytic cycle from a variety of peroxides (benzoyl peroxide, percarbonate, perborate) [2] other than the already mentioned peroxydisulfate. Representative examples are shown in Eqs (9)—(12) of Table 2. 

Vinyl monomers, such as styrene, methyl methacrylate, vinyl acetate, vinyl chloride or acrylonitrile are preferably polymerized by chain polymerization techniques initiated by free radicals. Suitable free radicals can be handily achieved from unstable chemicals like peroxides (benzoyl peroxide, dicumil peroxide) or di-azo reagents (e.g. 2,2 -azo-bis-isobutyronitrile, AIBN) which are dissolved in monomer and usually thermally decompose at temperature range of 40-120 °C. Alternatively, suitable radicals for polymerization can also be activated without addition of external initiators, by just applying ultraviolet light (wave length 200-350 nm) or ultrasound (15,33,34) onto monomer. 

The substitution of aluminum by oxygen can be effected by various peroxide derivatives, such as di-r-butyl peroxide, benzoyl peroxide and r-butyl perbenzoate. The main reaction is accompanied by telltale free-radical side reactions, such as the formation of RR from R3AI, which become major pathways with aryl and vinyl compounds. Oxidation of alkenyl derivative (56) with r-butyl perbenzoate yields 45% of a mixture of cis and trans ethers (57 equation 44). As of yet there is no generally applicable, highly efficient method for oxidizing vinylaluminum compounds. 

Azonitriles have generally been considered to be cleaner initiators in the sense of being devoid of chain transfer however, recent research w ork indicates this is not true. Other initiators/chain-transfer agents include /-butyl peroxide, cumyl peroxide, lauryl peroxide, benzoyl peroxide, /-butyl hydroperoxide, cumyl hydroperoxide, dicumyl peroxide, and persulfate the half-lives of these initiators are given in Table 4.2 [185],... 

Most functional monomers and cross-linkers contain one or more vinyl functionalities. Polymerization of this type of compound for the preparation of MIPs is traditionally performed as a free-radical polymerization, initiated via either ther-molytic or photolytic homolysis of an initiator. One of the most commonly used free radical initiators for this purpose is 2,2 -azobis (isobutyronitrile) (AIBN). Other examples of free-radical polymerization initiators are phenyl-azo-triphenyl-methane, tert-butyl peroxide (TBP), acetyl peroxide, benzoyl peroxide (BPO), lauroyl peroxide, tert-butyl hydroperoxide and tert-butyl perbenzoate. 

Extended studies on starch etherification with C2 to C5 aliphatic alkylene oxides in alkaline slurries have been performed 944,945 This reaction was subsequently re-examined for hydroxypropylation.946 No significant effects were observed as a result of using added hydrogen peroxide, benzoyl peroxide, azodiisobutyronitrile, or K2S2O8.945 In all instances, including those studied without such additives, led to water- and alcohol-soluble thermoplastic materials. Further improvements involved etherification in either acetone or butanone in the presence of aqueous NaOH. Ethylene oxide was introduced incrementally.947 Etherification of starch... 

Dibenzoyl Peroxide Benzoyl Peroxide Benzoyl Superoxide BP BPO Lucidol-70... 

Azo compounds 4-(2-pyridylazo)resorcin Peroxides Benzoyl peroxide... 

Benzoyl peroxide. Benzoyl peroxide encourages peeling of the ontermost layer of the skin and, as mentioned previously, is a mild bactericidal agent. It kills bacteria by virtue of its oxidizing properties. It is often inclnded in prescription acne medications, and in nonprescription acne prodncts snch as gels, lotions, and cleansers. It may be used alone or with other treatments. At even low concentrations (2.5-10%), benzoyl peroxide diminishes the popnlation of Propionibacterium acnes. The most common adverse effects are dry skin and bleaching of the skin. 

Methyl Ethyl Ketone Peroxide Benzoyl Peroxide Ether Peroxides Peracetic Acid Potassium Metal Vinylidene Methyl Acetylene Cyclopentane... 

Special Precautionary Note. Just like other Organic Peroxides, benzoyl peroxide may be handled with utmost care and restrain behind well-guarded shatter-proof screens and always horn or moulded polyethylene (Not Nickel or Stainless Steel) spatulas must be employed. It is an extremely Shock-Sensitive substance. 

OTHER INGREDIENTS Inhibitors to prevent premature cross-linking and to allow a suitable shelf life (e.g., hydroquinone). Initiators (catalysts) methyl ethyl ketone peroxides, benzoyl peroxides, etc. Accelerators cobalt naphthenate, cobalt octanoate, etc. 

CAS-No [94-36-0] bmzolc acid peroxide benzoyl peroxide benzoyl euperoxide... 

Diacyl peroxides (benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, dilauroyl peroxide, diacetyl peroxide). 

Urea Phosgene Vinyl chloride Lauroyl peroxide Benzoyl peroxide Methylene chloride... 

Aliphatic or aromatic peroxide curing agents can also be used, by reactions with vinyl side chains or even saturated alkyl groups. Specific peroxides are chosen on the basis of their decomposition temperatures, and the reaction products they leave behind after the curing process is complete. Some peroxides used are bis(2,4-dichlorobenzoyl)peroxide, benzoyl peroxide, dicumyl peroxide, and di-t-butyl peroxide. ° ... 

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