Dicumyl peroxide

Dicumyl peroxide is a crystalline solid that melts at 42°C. It is insoluble in water and soluble in vegetable oil and organic solvents . It is used as a high-temperature catalyst in production of polystyrene plastics. The deflagration hazard potential of this peroxide was tested using 5 g of igniter in the revised time–pressure test, but no pressure rise was produced . Noller et al. found it to be an intermediate fire hazard.

Dicumyl peroxide(DCP) is used:
in vulcanization of rubber
as a crosslinking agent in the synthesis of polylactic acid composite fibers
in the preparation of polyethylene composites
in the synthesis of polyamide 112/ethylene vinyl acetate copolymer blends.

Dicumyl peroxide is a pale yellow to white granular solid with a characteristic odor. It is used as a polymerization catalyst and vulcanizing agent.

The explosive instability of the lower dialkyl peroxides (e.g., dimethyl peroxide) and 1,1-bis-peroxides decreases rapidly with increasing chain length and degree of branching, the di-tert-alkyl derivatives being amongst the most stable class of peroxides. Though many 1,1-bis-peroxides have been reported, few have been purified because of the higher explosion hazards compared with the monofunctional peroxides. Dicumyl peroxide is unlikely that this derivative would be particularly unstable compared to other peroxides in it's class, Bretherick 2nd ed., p 44 1979.

Non flammable

reagent type: oxidant

Mildly toxic by ingestion. See also PEROXIDES. When heated to decomposition it emits acrid smoke and irritating fumes.

Crystallise the peroxide from 95% EtOH (charcoal). Store it at 0o. Potentially EXPLOSIVE. [Beilstein 6 IV 3220.]

The initial threshold screening level (ITSL) for dicumyl peroxide will remain 0.1 μg/m3 (annual averaging time).