Nitrogen Oxide Stable Radicals in the Thermal Oxidation of Polyformaldehyde

CONSUMPTION OF NITROGEN OXIDE STABLE RADICALS IN THE THERMAL OXIDATION OF POLYFORMALDEHYDE 

The kinetics of the destruction of the radical inhibitor is described by a first-order equation, i.e., its consumption is apparently related not only to termination of the oxidation chains. A substantial role in this case is also played by evaporation of the inhibitor from the polymer at high temperatures. 

It was successfully shown with the aid of the EPR method that radical II is very stable imder vacuum and in inert silicone liquid at 200°C. A study of the evaporation of the radical inhibitor II from the pol5rmer at 200°C in air showed that by the end of the experiment this value comprises only 6-10% of the initial radical concentration. 

We can see from these data that the radical inhibitors are consumed mainly according to a reaction related to inhibition of the thermal oxidation of polyformaldehyde. 

The inhibition of the oxidation of polyformaldehyde by radical-type stabilizers is also indirect evidence in favor of the occurrence of the process of destruction of polyformaldehyde according to a radical mechanism. 

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