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Stabilization by Decreasing Initiation Rate

Some polyaromatic compounds [24] may be used in the case of radiochemical ageing to dissipate directly the incident ray energy by some photophysical processes (such as fluorescence). In the case of a hip, there is however no interest to prevent polymer from y ray effect since y-radiations improve the mechanical properties of the polymer. It is preferable to limit the side effect of the radiation induced radicals during the in vivo thermal ageing of polymer. [Pg.46]

Since alkyl radicals lead to hydroperoxides (see 3.2.1. Mechanism of oxidation [18]) being the main source of radicals during thermal oxidation [18], it can be first tried to decrease POOH concentration by reducing them into stable products using hydroperoxides reducers such as  [Pg.46]

The sulfur yields to a sulfate, which could possibly have a further stabilizing role by successive reactions with POOH [29]  [Pg.46]

Since hydroperoxide decomposition is catalyzed by metallic ions [30]  [Pg.47]

Some stabilizers contain therefore a metal-coordinating functionality [31,32]  [Pg.47]


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Decreasing

Initial rate

Stability rates

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