Autotermination

This kind of autotermination was described in the polymerization of m, / -and D. 6-dinitrostvrenes... 

There probably exist more reactions leading to autotermination than we are aware of at present. These also include processes listed with other effects, for example pseudotermination [114]... 

Termination of the radical chain reaction As the reaction proceeds, autoxidation is followed by an autoretardation stage, resulting in a standstill before the hydrocarbon is completely consumed. This autotermination is called the chain termination reaction and dominates in this final phase of the oxidation process such that degradation comes to a halt. Termination may be effected by the combination of radical species such as peroxy radicals to yield ketones and alcohols. Reaction sequence (4.14) ... 

Thermal oxidation occurs when heat and oxygen are exposed to the seal. The term auto-oxidation is used for temperatures between ambient and 200°C. Shelton proposed the kinetic scheme for rubber shown in Figure 8.19. Autotermination by coupling or disproportionation of radicals will occur [18]. Hydrogen peroxide is assumed to be a source of radicals that will initiate oxidation in polymers [18]. 

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