HEAT CATALYST

Polymerization of resin requires initiation by a free radical.  Initiation starts propagation or continued joining of molecules at double bonds until termination is reached.  Heat applied to initiators breaks down chemical structure to produce free radicals, however, monomers may polymerize when heat is applied even without initiators.

Resins require stabilizers to avoid spontaneous polymerization.  Stabilizers are also used to control the reaction of activators and resin mixtures.  Hydroquinone is most commonly used as a stabilizer. 

Common heat based initiators are peroxides such as

benzoylperoxide

t-butylperoxide

t-cumythydroxyperoxide

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