The organic peroxide is a colorless to pale yellow liquid, or a solid in a white powder state to a crystalline state. Generally weak acid, most insoluble in water, soluble in phthalic acid and dimethyl ether and other organic solvents, Organic Peroxides is a class of unstable flammable and explosive compounds.
Organic peroxides are free radicals for use in the following applications: (1) radical polymerization and copolymerization initiators of vinyl and diene monomers; (2) vulcanizing agents for thermosetting resins; (3) crosslinkers for elastomers and polyethylenes The
The decomposition temperature of an organic peroxide at an effective rate largely determines its use. Other important factors are cost, solubility, and safety. Efficiency and the type of free radicals generated, the need for frozen storage and freight, compatibility with the production system, Organic Peroxides the possible impact on the product, and the ability to be activated. Organic peroxides can be controlled at high temperature or room temperature to produce a certain rate of decomposition of reactive radicals.
All organic peroxides are thermally unstable and decomposed with increasing temperature. The usual quantitative method for the determination of organic peroxides is to determine the half-life, that is, the time required for a certain amount of peroxide to decompose at a specific temperature to half its initial amount. Organic Peroxides The half-life data for commercial organic peroxides are now available on computer floppy disks. Use the computer menu program to select the appropriate peroxide for a polymerization or process conditions.
These free radicals can be added to unsaturated vinyl monomers such as styrene, vinyl chloride or methyl methacrylate to initiate polymerization. Some free radicals also attack polymers such as PE to generate free radicals in the chain. When two such polymer radicals are bound together, Organic Peroxides a crosslinked structure is formed.
Organic peroxides are liquid or solid organic substances containing a divalent -0-0-structure and can be thought of as hydrogen peroxide derivatives in which one or two hydrogen atoms are replaced by organic groups. The term also includes organic peroxide formulations (mixtures). Organic peroxides are thermally unstable substances or mixtures that are free from heat from self-accelerating decomposition. In addition, they may have one or more of the following properties: a) easy to explode decomposition; b) rapid combustion; c) sensitive to impact or friction; d) dangerous reaction with other substances.
The decomposition products of organic peroxides are lively free radicals, Organic Peroxides and the reaction by free radicals is difficult to suppress by conventional inhibition methods. Because many of its decomposition products are gas or volatile substances, plus can provide oxygen, prone to explosive decomposition. The more peroxide content in organic peroxides, the lower the decomposition temperature, the greater the risk. Organic Peroxides Such as the production of pure diacetyl peroxide after storage 24h may be a strong explosion; dibenzoyl peroxide when the water content of 1% (mass fraction) below, a slight friction that can explode; Propyl ester at 10 ℃ above the instability, to 17.22 ℃ when decomposition decomposition; peracetic acid (peracetic acid) pure product is very unstable, at minus 20 ℃ when the explosion, 40% of the solution in the storage process can still be Decomposition of oxygen, heated to 110 ℃ when the explosion.