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Why do we purge nitrogen gas into stock solutions in polymer synthesis using ATRP controlled polymerisation?

Why do we purge nitrogen gas into stock solutions in polymer synthesis using ATRP controlled polymerisation?

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Answer #1

This is done in order to evacuate / remove oxygen from reaction mixture because oxygen acts as an retarder ie it wil inhibit or slow down the polymerization rate by queching of generated free radical very rapidly thus acts as a barrier in radical formation which results in either low yield of polymerization product or the reaction will not go successfully.

So, to get best results using polymer synthesis it is advised to maintain oxygen free environment by purging nitrogen gas into the stock solutions.

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